20A - AA - PLAN CHECK SERVICES - Laserfiche WebLink

Home Browse Search

NABIH YOUSSEF A S S O C I A T E S STRUCTURAL ENGINEERS December 15, 2010 Fred Heidari Deputy Building Official City of Santa Ana Planning and Building Agency 20 Civic Center Drive, M-19 Santa Ana, CA. 92702 RE: One Broadway Plaza - City of Santa Ana Plan Check, (NYA # 07332.01) Structural Engineering Consulting Services Dear Mr. Heidad, NYA is pleased to provide this proposal to assist the City of Santa Ana Building. and Safety Division with a structural plan check of the proposed project at 1001-1005 North Broadway Street at "One Broadway Plaza". The proposed project consists of: One 37 story Office Tower with basement level - approx 692,150 SF. In the absence of additional information, our proposal is based on the following assumptions: 1. A complete 100% Construction Document package (not phased permitting) will be presented for our review. We are assuming that cladding, equipment anchorage, stairs, elevators, etc. will be deferred approval items not part of this review. 2. The building configurations, structural systems & framing for the subject building will be identical to the 2008 drawings that NYA reviewed & approved previously. 3. All building elements shall be redesigned as required to meet the CBC 2007 code requirements. Among others, we list below a few of the important code changes that may impact the subject building redesign: a. It should be verified by the design team & the architectural plan reviewer if the code change triggers any occupancy category changes especially with respect to the use of the two story atrium spaces at building entry or any other public assembly type uses (the Building Importance factor, I, could go up). b. The entire lateral force resisting system will need to redesigned & rechecked due to the code change. in particular, for the 37-story tower which utilizes a dual structural system - the R factors have been reduced in the new code. New/ different redundancy checks, irregularity checks, modeling requirements, P-Delta checks, etc. will need to be performed as part of the new lateral design. c. Design needs to be updated for new code load combinations; Design of discontinuous/ irregular elements for overstrength needs to Include resistance factors. d. All concrete anchorage related Items need to satisfy ACI 318-05 Appendix D requirements. e. All wind design related items will need to be redone per the new code requirements. Wind load requirements are more involved & higher per the new code - especially for roof elements & misc. parapets, canopies etc. f. Steel SMRF elements & corresponding column bases/ anchorages need to be designed per AISC 2005 Seismic Provisions. g. Foundations need to be redesigned corresponding to new code forces & requirements incorporating new findings on reduced punching shear capacity of unreinforced concrete deep sections, etc. Fees: 50 California Street, Suite 3150, Son Francisco. CA • Phone (415)397-5213 • Fox (415)392-9605 • W W W.NYASE.COM LOS ANGELES IRVINE SAN FRANCISCO 20A-13