HomeMy WebLinkAboutNS-1598RJW/fm
8/10/81
ORDINANCE NO. NS- 1598
A/q ORDINA/qCE OF THE CITY OF SANTA ANA AMEND-
ING SECTIONS 8-2002, 8-2004, 8-2005 AND
8-2006 OF, AND ADDING SECTION 8-2004.5 TO,
ARTICLE XI OF CHAPTER 8 OF THE SANTA ANA
MUNICIPAL CODE, PERTAINING TO EARTHQUAKE
HAZARD REDUCTION IN EXISTING BUILDINGS
THE CITY COUNCIL OF THE CITY OF SANTA ANA DOES
ORDAIN AS FOLLOWS:
SECTION 1: That Section 8-2002 of the Santa Aha Municipal
Code, is hereby amended to read as follows:
SECTION 8-2002. DEFINITIONS
Por the purpose of this article, the following
terms shall be construed as follows:
(a) ABBREVIATIONS: Ail numbers, letters, sy~ls,
abbreviations and words used in this article, which are not
otherwise defined herein, shall have those meanings ascribed
to them as found in Chapter 23 of the Uniform Building Code.
(b) BUILDING: Any structure used or intended for
supporting or sheltering any use or occupancy.
(c) DEPARTMENT: The Department of Planning and Develop-
ment Services.
(d) DIRECTOR: The Director of the Department of
Planning an--d~opment Services or his designated represen-
tative.
(e) ESSENTIAL BUILDING: Any structure or building
which is used for emergency purposes after an earthquake in
order to preserve the peace, health and safety of the general
public. Such facilities shall include the following: hospitals
and other medical facilities having surgery or emergency
treatment areas; fire and police stations; municipal govern-
ment disaster operation centers; and public utility and
communication buildings deemed to be vital in emergencies.
(f) HIGH RISK BUILDING: Any building, other than an
essential building, having an.occupant load of one hundred
(100) occupants or more as determined pursuant to Table
No. 33-A of Chapter 33 of the Uniform Building Code.
EXCEPTION: A high risk building shall not include
the following:
1. Any building used for its intended purpose,
as determined by the Department, for less than twenty (20)
hours per week.
2. Any building having exterior walls braced
with masonry cross walls or wood frame cross walls spaced
less than forty (40) feet apart in each story.
(g) LOT: A parcel of real property shown on an approved
final subdivision map or record of survey subdivision map or
a recorded parcel described by metes and bounds.
ORDINANCE NO. NS- 1598
Page Two
(h) LOW RISK BUILDING: Any building, other than an
essential building, having an occupant load of less than
twenty (20) occupants, as determined pursuant to Table
No. 33-A of Chapter 33 of the Uniform Building Code.
(i) MEDIUM RISK BUILDING: Any building, other than a
high risk building or an essential building, having an
occupant load of twenty (20) occupants or more, as determined
pursuant to Table No. 33-A of Chapter 33 of the Uniform
Building Code.
(j) OWNER: Any individual, individuals, partnership,
firm or corporation who is the owner of record of the building
as shown on the equalized assessment role of the Office of
the County Assessor of the County of Orange.
(k) UNREINFORCED MASONRY WALL: A masonry wall containing
less than one-half (1/2) the reinforcing steel required for
reinforced masonry walls in accordance with Chapter 24 of
the Uniform Building Code.'
SECTION 2: That Section 8-2004 of the Santa Ana Municipal
Code, is hereby amended to read as follows:
SEC. 8-2004. ADMINISTRATION
(a) PRIORITY OF NOTIFICATION. The director shall
notify owners and tenants of buildings within the scope of
this article in accordance with the rating classifications
as set forth in Table A in Section 8-2003 of this article.
In general, buildings having a rating classification of I
shall be notified first; buildings having a rating classification
of II shall be notified second, but not earlier than six (6)
months after the effective date of this article; buildings
having a rating classification of III shall be notified
third, but not earlier than eighteen (18) months after the
effective date of this article; and buildings having a
rating classification of IV shall be notified last, but not
earlier than five (5) years after the effective date of this
article. Within each separate Rating Classification, the
notification shall normally be based on the occupant load of
the building, with the buildings housing larger occupant
loads being notified first. Upon receipt of a written
request from the owner, the director shall serve notification
ordering a building into compliance with this article prior
to the normal notification date set forth in this section.
(b) NOTIFICATION. Following the priorities listed in
subsection (a) of this section, the director shall serve
notice ordering the owner of each building within the scope
of this article to cause a structural analysis to be made of
the building by a licensed civil or structural engineer or
licensed architect. If the building is found to be deficient
under the standards established by this article, the owner
shall cause said building to be structurally altered so as
to conform to those standards or cause it to be demolished.
The notice or order shall be in writing and shall
be served either personally or by first class mail, return
receipt requested, upon the owner as shown in the last
equalized assessment roll, and upon each tenant, if any, who
is occupying the building, or any portion thereof, on the
date such notice is mailed or served. Failure of any tenant
to receive such order or notice shall not in any manner
invalidate any of the proceedings taken by the director
pursuant to the provisions of this article.
ORDINANCE NO. NS- 1598
Page Three
The aforesaid order shall direct that the structural
analysis together with the necessary plans and calculations
be submitted to the department for review within two-hundred
and seventy (270) days after service of the order. The
order shall specify that permits required to accomplish the
necessary structural alterations shall be obtained not later
than one (1) year after the service of the order, and that
the building be corrected to meet the minimum requirements
of this article, or be demolished, not later than three
years after such service. The necessary alterations shall
commence within one hundred and eighty (180) days of the
date that the permit was issued.
(c) RECORDATION: At the time when the director serves
the aforesaid order, the director shall file with the Office
of the County Recorder of the County of Orange a certificate
stating that the subject building is within the scope of
Santa Aha Municipal Code, Article XI of Chapter 8, "Earthquake
Hazard Reduction in Existing Buildings." The certificate
shall also state that the owner thereof has been notified
and ordered to structurally analyze the building and to
structurally strengthen or demolish it where compliance with
Article XI is not exhibited.
If the building is either demolished, found not to
be within the scope of this article, or is found to be
structurally capable of resisting minimum seismic forces
required by this article, the director shall file with the
Office of the County Recorder a certificate terminating the
status of the subject building as being classified within
the scope of Santa Ana Municipal Code, Article XI of Chapter 8,
"Earthquake Hazard Reduction in Existing Buildings."
(d) APPEAL FROM ORDER. Any owner or tenant of the
building may appeal the director's initial order and determina-
tion so long as such appeal is filed within one hundred and
eighty (180) days of the service of the aforesaid order.
All appeals shall be filed with the uniform code appeals
board, as the same is established pursuant to Section 2-450
of this Code. The form of appeal, the processing of the
appeal, the scheduling and noticing of said appeal for
hearing, the effect of a failure to appeal, the scope of
hearing of said appeal, and the procedure for conducting the
hearing of any such appeal, shall be governed by the pro-
visions of Chapters 5 and 6 of the Uniform Code for the
Abatement of Dangerous Buildings, as said uniform code is
adopted by reference pursuant to the provisions of Article IX
of Chapter 8 of this Code. In case of any inconsistency
between the provisions of this subsection and the provisions
of Chapters 5 and 6 of the Uniform Code for the Abatement of
Dangerous Buildings, the provisions of this subsection shall
control.
(e) ENFORCEMENT. If the owner or tenant fails to
comply with any order issued by the director within any of
the time limits set forth in subsection (b) of this section,
or of any order or decision of the director made pursuant to
subsection (b) of Section 8-2004.5 of this article, or with
any order or decision rendered by the uniform code appeals
board, the building shall be deemed to constitute a dangerous
building and the provisions of Chapters 7, 8 and 9 of the
Uniform Code for the Abatement of Dangerous Buildings, as
said uniform code is adopted by reference in Article IX of
Chapter 8 of this Code, shall be applicable. Any person
found guilty of a misdemeanor shall be punished in the
manner set forth in Section 1.8 of this Code.
ORDINANCE NO. NS-1598
Page Four
SECTION 3: That the Santa Ana Municipal Code is hereby
amended by adding a section, to be numbered 8-2004.5, which
said section reads as follows:
SECTION 8-2004.5.
OWNERS
EXTENSIONS BY ADJOINING BUILDING
(a) APPLICATION. The owners of two (2) or more buildings
which are subject to the provisions of this article, which
buildings are under separate ownership, located on adjoining
or abutting lots and are physically contiguous and inter-
connected with each other, may jointly apply to the director
for an extension of the time limits specified in subsection
(b) of Section 8-2004 of this article. Such joint application
for an extension may be filed even though each of the build-
ings included within the application have been placed in
different rating classifications by the director pursuant to
subsection (a) of Section 8-2004 of this article. No building
may be included within any such joint application, and no
such application shall be considered by the director, if
more than one hundred and eighty (180) days have elapsed
between the date the director mailed or served the initial
order or notice on the owner of any such building and the
date on which the joint application is filed. Said application
for an extension shall be accompanied by a written statement
indicating the name and address of the engineer and/or
architect engaged or retained by the building owners filing
the application, the plan of action contemplated by the
applicants in terms of conforming each of the buildings to
the requirements of this article, the accomplishments towards
the same as of the date the application is filed, and an
estimate of the time required to complete the formulation of
the proposed plan of action.
(b) ACTION BY DIRECTOR. The director shall have sixty
(60) days from the date the application is filed in which to
either approve or disapprove the application, unless the
applicants agree to extend said time period. If the applicants
meet the requirements stated in subsection (a) of this
section, and if the director determines that the purposes of
this article would be served if said application were approved,
then the director may approve the application for an extension;
otherwise, the director shall deny the same. In approving
an application, the director shall have the authority to
modify any or all of the time limits set forth in subsection (b)
of Section 8-2004 of this article for achieving compliance
with the provisions of this article; provided, however, that
if two or more of the buildings included within the application
have been placed in different rating classifications by the
director, the extension granted by the director shall be
based on an average of the maximum time limits specified in
subsection (b) of Section 8-2004 in which to bring each such
building into conformance with this article but in no event
shall any such extension be less than for a period of six
(6) months from the date the application is filed.
No application for an extension shall be granted
unless the building owners who have submitted the application
have executed and submitted to the director an agreement
between themselves whereby each owner agrees, inter alia, to
bring the building owned by such owner into compliance with
the provisions of this article within the revised time
limits specified by the director. Such agreement shall be
subject to the approval of the city attorney. Failure of
the property owners filing the joint application for an
extension to execute and submit said agreement to the director
within sixty (60) days after the application is filed shall
ORDINANCE NO. NS- 1598
Page Five
constitute grounds for denial of the application by the
director, and such owners shall have no right of appeal from
such denial.
(c) APPEAL. If an application is denied, other than
for the owners' failure to execute and file with the director
the agreement specified in subsection (b) of this section,
the director shall specify in writing the reason or reasons
why said application is denied. Within fifteen (15) days after
the director mails notice of the denial of the application,
any owner may appeal the director's denial to the uniform
code appeals board in the manner specified by subsection (d)
of Section 8-2004 of this article. Thereafter, said appeal
shall be governed by the provisions of subsection (d) of
Section 8-2004 of this article.
SECTION 4: That section 8-2005 of the Santa Aha Municipal
Code, is hereby amended to read as follows:
Sec. 8-2005. ANALYSIS AND DESIGN
(a) GENERAL. Every structure within the scope of this
article shall be analyzed and constructed to resist minimum
total lateral seismic forces assumed to act nonconcurrently
in the direction of each of the main axes of the structure
in accordance with the following equation:
V = IKCSW
The value of "IKCS" need not exceed the values set forth in
Table B based on the appropriate priority rating.
TABLE B
HORIZONTAL FORCE FACTORS BASED
ON RATING CLASSIFICATION
RATING
CLASSIFICATION IKCS
I 0.186
II 0.133
III & IV 0.100
(b) LATERAL FHRCES ON ELEMENTS OF STRUCTURES. Parts
or portions of structures shall be analyzed and designed for
lateral loads in accordance with Chapter 23 of the Uniform
Building Code but no less than the value from the following
equation:
F = IC SW
P P P
For the provision of this subsection, the product of "IS"
need not exceed the values as set forth in Table C.
EXCEPTION: Unreinforced masonry walls in buildings
not having a rating classification of I may be analyzed in
accordance with Section 8-2006.
(c) ANCHORAGE AND INTERCONNECTION. Anchorage and
interconnection of all parts, portions and elements of the
structure shall be analyzed and designed for lateral forces
in accordance with the equation F IC SW as modified by
Table C. Minimum anchorage of masonry ~all~ to each floor
or roof shall resist a minimum force of two hundred (200)
pounds per lineal foot acting normal to the wall at the
level of the floor or roof.
ORDINANCE NO. NS- 1598
Page Six
TABLE C
HORIZONTAL FORCE FACTORS "IS"
FOR PARTS OR PORTIONS OF STRUCTURES
RATING
CLASSIFICATION IS
I 1.50
II 1.00
III & IV 0.75
(d) LEVEL OF REQUIRED REPAIR. Alterations and repairs
required to meet the provisions of this article shall comply
with all other applicable requirments of this Code unless
specifically excluded elsewhere in this article.
(e) REQUIRED ANALYSIS.
1. CONTINUOUS STRESS PATH. A complete, continuous
stress path from every part or portion of the structure to
the ground shall be provided for the required horizontal
forces.
2. POSITIVE CONNECTIONS. Ail parts, portions or
elements of the structure shall be interconnected by positive
means.
(f) ANALYSIS PROCEDURE.
(1) GENERAL. Stresses in materials and existing
construction utilized to transfer seismic forces from the
ground to parts or portions of the structure shall conform
to those permitted by the Uniform Building Code and those
materials and types of construction specified in Section
8-2006.
(2) CONNECTIONS. Materials and connectors used
for interconnection of parts and portions of the structure
shall conform to the Uniform Building Code.
(3) UNREINFORCED MASONRY WALLS. Unreinforced
masonry walls shall be analyzed to insure their capability
of resisting superimposed vertical loads in addition to the
seismic forces required by this Article.
Allowable stresses in such walls shall be obtained
by tests utilizing values established by laboratory testing
as specified in subsection (e) of Section 8-2006. However,
no allowable tension stress will be permitted. Walls not
capable of resisting the applied loads shall be strengthened
to resist the forces specified in this article or shall be
removed and replaced.
EXCEPTIONS:
1. Unreinforced masonry walls in buildings not
classified as a Classification Rating I may be analyzed in
accordance with the provisions of Section 8-2006.
2. Unreinforced masonry walls which carry no
design loads other than their own weight may be considered
as veneer if they are adequately anchored to new supporting
elements.
ORDINANCE NO. NS- 1598
Page Seven
(g) COMBINATION OF LOAD EFFECTS.
(1) NEW MATERIALS. Combination of load effects
shall conform to the Uniform Building Code for all new
materials introduced into the building structure to meet the
requirements of this section.
(2) EXISTING MATERIALS. When stress in existing
lateral force resisting elements is due to a combination of
dead loads plus live loads plus seismic loads, the allowable
working stress specified in the Code may be increased one
hundred (100) percent. However, no increase shall be permitted
in the stresses allowed in Section 8-2006 of this article
and the stresses in members due only to seismic and dead
loads shall not exceed the values permitted by Chapter 23 of
the Uniform Building Code.
(3) ALLOWABLE REDUCTION OF BENDING STRESS BY
VERTICAL LOAD. In calculating maximum tensile stress due to
earthquake forces, the maximum tensile fiber stresses may be
reduced by not more than one hundred (100) percent of the
direct stress due to vertical dead loads.
SECTION 5: That Section 8-2002 of the Santa Ana Municipal
Code, is hereby amended to read as follows:
SEC. 8-2006. MATERIALS OF CONSTRUCTION
(a) GENERAL. Ail materials permitted by this Code
including their appropriate allowable stresses and those
existing configurations of materials specified herein may be
utilized to meet the requirements of this article.
(b) EXISTING MATERIALS.
(1) UNREINFORCED MASONRY WALLS. Unreinforced
masonry walls analyzed in accordance with this section may
provide vertical support for roof and floor construction and
resistance to lateral loads.
Tension stresses due to seismic forces normal to
the wall may be neglected if the wall does not exceed the
height or length to thickness ratio and the in-plane shear
stresses due to seismic loads as set forth in Table D.
TABLE D
ALLOWABLE VALUE OF
UNREINFORCED MASONRY WALLS ,~,
WITH MINIMUM QUALITY MORTAR~£;
RATING
CLASSIFICATION
MAXIMUM RATIO
UNSUPPORTED
HEIGHT OR LENG~
To THICKNESS--'
I Not applicable(2)
II 9
III 10
IV 12
SEISMIC IN-PLANE
SHEAR STRESS
BASED ON GROSS AREA
Not applicable (2)
3 psi (3)
3 psi (3)
3 psi (3)
ORDINANCE NO. NS-1598
Page Eight
FOOTNOTES:
(1) Minimum quality mortar shall be determined by
laboratory testing in accordance with subsection (f) of
Section 8-2005.
(2) Walls of buildings within rating classification
shall be analyzed in accordance with subsection (f) of
Section 8-2005.
(3) Allowable shear stress may be increased by the
addition of ten (10) percent of the direct stress due to the
weight of the wall directly above.
(4) The height to thickness ratios may be increased by
twenty percent (20%) for the first floor of a building of
two or more stories. The height or length may be measured
horizontally to supporting elements provided the stiffness
of the existing unreinforced masonry supporting member is at
least twice the stiffness of the tributary wall. Stiffnesses
are to be based on gross section. For new or existing
stiffening elements which are not of unreinforced masonry,
the element shall be capable of resisting three times the
tributary load determined by subsection (b) of Section
8-2005 without yielding or failing. The stiffening element
shall be connected to the structure in accordance with
subsection (c) of Section 8-2005 for the loads specified in
subsection (b) of Section 8-2005.
(2) EXISTING ROOF, FLOORS, WALLS, FOOTINGS, AND
WOOD FRAMING. Existing materials utilized in the described
configuration may be used as part of the lateral load resisting
system, provided that the stresses in these materials do not
exceed the values shown in Table E.
TABLE E
VALUES FOR EXISTING MATERIALS
MATERIALS(2) ALLOWABLE VALUES
(1)
HORIZONTAL DIAPHRAGMS
(a) Roofs with straight
sheathing and roofing
applied directly to the
sheathing.
150 lbs. per foot for
seismic shear.
(b) Roofs with diagonal
sheathing and roofing
applied directly to the
sheathing.
400 lbs. per foot for
seismic shear.
(c) Floors with straight
tongue and grove sheathing
150 lbs. per foot for
seismic shear.
(d) Floors with straight
sheathing and finished
wood flooring.
300 lbs. per foot for
seismic shear.
(e) Floors with diagonal
sheathing and finished
wood flooring.
400 lbs. per foot for
seismic shear.
(f) Floors or roofs with
straight sheathing and
plaster applied t~l~he
joist or rafters.- '
Add 50 lbs. per foot
to materials (1) (a) and
(1) (c).
ORDINANCE NO. NS- 1598
Page Nine
(2) SHEAR WALLS
(a) Wood stud walls with
wood lath and plaster.
50 lbs. per foot each
side for seismic shear.
(b) Wood stud walls with
plaster and lath other
than wood lath.
100 lbs. per foot each
side for seismic shear.
(3)
PLAIN CONCRETE FOOTINGS
f'A = 1500 psi unless
otherwise shown by tests.
(4)
DOUGLAS FIR WOOD
Allowable stress same as
No. (1) (d)-(f)
(5)
REINFORCING STEEL
ft = 20,000 lbs per
square inch maximum.
(6)
STRUCTURAL STEEL
f. = 20,000 lbs per
s~uare inch maximum.
FOOTNOTES:
(1) The wood lath and plaster must be reattached to
existing joists or rafters in a manner approved by the
department.
(2) Material must be sound and in good condition.
(c) STRENGTHENING OF EXISTING MATERIALS.
New materials may be utilized to strengthen portions
of the existing seismic resisting system in the described
configurations provided that the stresses do not exceed the
values shown in Table F.
TABLE F
ALLOWABLE VALUES OF NEW MATERIALS USED
IN CONJUNCTION WITH EXISTING CONSTRUCTION
NEW MATERIALS
ALLOWABLE VALUES
(1)
Plywood sheathing applied directly
over existing straight sheathing
with ends of plywood sheets bearing
on joists or rafters and edges of
plywood located on center of individual
sheathing boards.
Same as specified
in U.B.C. Table 25-J
for blocked diaphragm
(2) SHEAR WALLS:
(a) Plywood sheathing applied directly
over existing wood studs. No value
shall be given to plywood applied over
existing plaster or wood sheathing.
Same as specified
in U.B.C. Table
25-K for shear
walls.
(b) Dry wall or plaster applied directly
over existing wood studs.
Same as specified
in U.B.C. Table
47-I.
(c) Dry wall or plaster applied to
plywood sheathing over existing
wood studs.
33 1/3 percent of
the values specified
in U.B.C. Table 47-I.
ORDINANCE NO. NS- 1598
Page Ten
(3)
Shear bolts and shear dowels embedded
a minimum of 8 inches into unreinforced
masonry walls. Bolt centered in a 2 1/2
inch diameter hole with dry-pack or non-
shrink grout around circumference of
bolt or dowel. (1)
Same as value given
for solid masonry in
U.B.C. Table 24-G.
Max. 750 lbs.
(4)
Tension bolts and tension dowels ex-
tending entirely through unreinforced
masonry walls secured with bearing plates
on far side of wall with at least 30
square inches of area.(2)
1200 lbs. per bolt.
(5)
Reinforced masonry infilled openings in
existing unreinforced masonry walls with
dowels to match reinforcing.
Same value as for un-
reinforced masonry
walls.
(6)
Masonry piers and walls reinforced per
U.B.C. Section 2418 and designed for
tributary loads.
Same values as speci-
fied in U.B.C. Table
24-H.
(7)
Concrete footings, walls and piers
reinforced as specified in
Chapter 26 and designed for
tributary loads.
Same values as speci-
fied in U.B.C.
Chapter 26.
(8)
Foundation pressures for
structures exhibiting no
evidence of settlement.
Calculated existing
foundation pressure
due to max dead load
plus live load may be
increased 25% for dead
load, and may be in-
creased 50% for dead
load plus seismic load.
FOOTNOTES:
(1) Bolts and dowels to be tested as specified in
Section 8-2006.
(2) Bolts and dowels to be one-half (1/2) inch minimum
in diameter.
(d) ALTERNATE MATERIALS. Alternate materials, designs
and methods of construction may be approved by the department
in accordance with the provisions of Section 106 of the
Uniform Building Code.
(e) MINIMUM ACCEPTABLE QUALITY OF EXISTING UNREINFORCED
MASONRY WALLS.
(1) GENERAL PROVISIONS. Ail unreinforced masonry
walls utilized to carry vertical loads and seismic forces
parallel and perpendicular to the wall plans shall be tested
as specified in this section. All masonry quality shall
equal or exceed the minimum standards established herein or
shall be removed and replaced by new materials. Alternate
methods of testing approved by the department may be used.
Nothing shall prevent point with cement mortar of all the
masonry wall joints before the tests are first made. If the
exterior joints are pointed then the inside face must also
be pointed. Prior to any pointing, the wall surface must be
sand or water blasted to remove loose and deteriorating
mortar. All preparation and cement mortar pointing shall be
done under the continuous inspection of the director with a
subsequent written report to the department. All testing
shall be performed by an approved testing agency in accordance
with the requirements specified in this subsection.
ORDINANCE NO. NS- 1598
Page Eleven
EXCEPTION: Unreinforced masonry walls which carry
no design horizontal or vertical loads other than their own
weight may be considered as veneer if they are adequately
anchored to new supporting elements.
(2) NUMBER AND LOCATION OF TESTS. The quality of
mortar in all masonry walls shall be determined by performing
in place shear tests or by testing eight (8) inch diameter
cores. The minimum number of tests shall be two (2) per
wall or line of wall elements resisting a common seismic
force, one (1) per one thousand five hundred (1500) square
foot of wall surface, or eight (8) minimum, whichever requires
the largest number of tests or cores. The exact test or
core location shall be determined at the building site by
the licensed engineer or architect responsible for the
seismic analysis of the subject building. The results of
all tests or coring shall be recorded and reported.
(3) IN PLACE SHEAR TESTS. The bed joints of the
outer wythe of the masonry shall be tested in shear by
laterally displaying a single brick relative to the adjacent
bricks in that wythe. The opposite head joint of the brick
to be tested shall be removed and cleaned prior to testing.
The minimum quality mortar in eighty (80) percent of the
shear tests shall not be less than the total of thirty (30)
psi plus the axial stress in the wall at the point of the
test. The shear stress shall be based on the gross area of
both bed joints and shall be that at which movement of the
brick is first observed.
(4) CORE TESTS. A minimum number of mortar test
specimens equal to the number of required cores shall be
prepared from the cores and tested as specified herein. The
mortar joint of the outer wythe of the masonry core shall be
tested in shear by placing the circular core section in a
compression testing machine with the mortar bed joint rotated
fifteen (15) degrees from the axis of the applied load. The
mortar joint tested in shear shall have an average ultimate
stress based on the gross area of twenty (20) psi. The
average shall be made from the total number of cores made.
If test specimens cannot be made from the total taken the
shear value shall be reported as zero. The results of all
coring and shear testing shall be reported.
(f) TESTING OF SHEAR BOLTS. One-fourth of all new
shear bolts and dowels embedded in unreinforced masonry
walls shall be tested by the director using a torque calibrated
wrench to the following minimum torques:
1/2" diameter bolts or dowels =
5/8" diameter bolts or dowels =
3/4" diameter bolts or dowels =
40 foot-lbs.
50 foot-lbs.
60 foot-lbs.
No bolts exceeding 3/4 inch shall be used. Ail
nuts shall be installed over malleable iron or plate washers
when bearing on wood and heavy cut washers when bearing on
steel.
ORDINANCE NO. NS- 1598
Page Twelve
(g) DETERMINATION OF ALLOWABLE STRESSES FOR DESIGN
METHODS B~SED ON TEST RESULTS.
(1) DESIGN SHEAR VALUES. Design seismic in-plane
shear stresses greater than permitted in Table D shall be
substantiated by tests performed as specified in subsections
(e) (3) and (4) of Section 8-2006.
Design stresses shall be related to test results
obtained as noted in Table G. Intermediate values below the
maximum may be interpolated.
TABLE G
ALLOWABLE SHEAR STRESS FOR TESTED
UNREINFORCED MASONRY WALLS
Eighty percent
by test results
in psi not less
than
30 plus axial stress
40 plus axial stress
50 plus axial stress
or more
Average test results
cores in psi
Seismic in-plane
shear based on
gross area
~si(1)
20 3 ~ .(1)
26.7 4 ps~(1)
33.3 5 ps~- -
or more
FOOTNOTES:
(1) Allowable shear stress may be increased by addition
of ten (10) percent of the axial stress due to the weight of
the wall directly above.
(2) ~ESIGN COMPRESSION AND TENSION VALUES.
Design compressive stresses of analysis specified in this
section shall be one hundred (100) psi. Design tension
values for unreinforced masonry shall be assumed equal to
zero."
SECTION 6: If any section, subsection, sentence, clause,
phrase or portion of this ordinance is for any reason held
to be invalid or unconstitutional by the decision of any
court of competent jurisdiction, such decision shall not
affect the validity of the remaining portions of this ordinance.
The City Council of the City of Santa Aha hereby declares
that it would have adopted this ordinance and each section,
subsection, sentence, clause, phrase or portion thereof
irrespective of the fact that any one or more sections,
subsections, sentences, clauses, phrases, or portions be
declared invalid or unconsitutional.
SECTION 7: Neither the adoption of this ordinance nor the
repeal hereby of any ordinance shall in any manner affect
the prosecution for violation of ordinances, which violations
were committed prior to the effective date hereof, nor be
construed as affecting any of the provisions of such ordinance
relating to the collection of any such license or penalty or
the penal provision applicable to any violation thereof, nor
to affect the validity of any bond or cash deposit in lieu
thereof, required to be posted, filed or deposited pursuant
ORDINANCE NO. NS- 1598
Page Thirteen
to any ordinance and all rights and obligations hereunder
appertaining shall continue in full force and effect.
ADOPTED, this 8th day of September
by the following vote:
, 1981,
AYES:
NOES:
ABSENT:
COUNCILSIENBERS: Acosta, Bricken, Griset,
Luxembourger, Markel, McGuigan, Serrato
COUNCILMEMBERS: None
COUNCILMEMBERS: None
ATTEST:
CLERK OF THE COUNCIL
GORDON ~CKEN
MAYOR
APPROVED AS TO FORM:
EDWA J. CO ER, C_3
CITY ATTORNEY