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CITY OF SANTA ANA Planning and Building Agency Part 9: Structural Design ° Approved 2009 IBC Eq. 16-21 for alternative ASD; 0.9D ( R PERMIT ISSUANCE and neglecting the term Hit is apparent that the first two equations are compatible with eac other, with the former representing strength -level fomes and thh££ latter representine corresponding service -level forces. The third equation WN.6r,tlilclucles the earthdLfid, load at service level (0.7E) while still having the goad, which counteracts th overturning effect of lateral earthquake forces, at streigth level 0.91)As a result. alternative basic ASD load combination provides a lesser margin of safety agains overturning, compared to those provided by the basic load combinations for strength desig; and allowable stress design. 11213.5 Requirements for structures assigned to Seismic Design Category C. This section give design requirements for pole -type structural elements (Section 12.13.5.1), foundation tie (Section 12.13.5.2), and pile anchorage (Section 12.13.5.3). The foundation tie requiremen was in Section 1807.2 of the 1997 UBC. The minimum tie force was a fixed 10 percent o the larger column vertical load, whereas in ASCE 7-05 it is a function of SDs. The foundatiol tie requirements are also found in Section 1810.3.13 of the 2009 IBC, which also include; an additional minimum tie force of 25 percent of the smaller pile or column design gravit} load. The pile anchorage requirements are also found in Section 1810.3.11.1 of the ZOOS IBC. a 2.13.6 Requirements for structures assigned to Seismic Design Categories D through F. Thi,, section gives additional requirements for pole -type structural elements (Section 12.13.6.1). foundation ties (Section 12.13.6.2), general pile design requirements (Section 12.13.6.3), batter piles (Section 12.13.6.4), pile anchorage (Section 12.13.6.5), splices of pile segment (Section 12.13.6.6), pile -soil interaction (Section 12.13.6.7) and pile -group effects (Section 12.13.6.8). Under Section 12.13.6.2, ties are required to interconnect individual spread footings found on Site Class E or F, not just individual pile caps, drilled piers or caissons, as in Section 12.13.5.2. The minimum tie force does not change from Section 12.13.5.2 to 12.13.6.2. The general pile design requirement of Section 12.13.6.3 is very similar to the requirement represented by the first two sentences of 2009 IBC Section 1810.2.4.1. Batter piles are covered in Section 1810.3.11.2 of the 2009 IBC. The IBC requirement that the connection between batter piles and pile caps be designed to resist the nominal strength of the pile acting as a short column is not found in ASCE 7-05. The ASCE 7-05 requirement concerning vertical and batter piles acting jointly to resist foundation forces as a group is not found in the 2009 IBC. The requirement that batter piles and their connections be capable of resisting forces and moments from the load combination including overstrength is common between ASCE 7-05 and the 2009 IBC. The anchorage requirements of Section 12.13.6.5 are found in 2009 IBC Section 1910.3.11.2. The splice requirements of Section 12.13.6.6 are found in 2009 IBC Section 1810.3.11.1, which is applicable in SDC C and above. The pile soil interaction provisions of Section 12.13.6.7 can be found in 2009 IBC Section 1810.2.4, whereas the pile group effect provisions of Section 12.13.6.8 are found in 2009 IBC Section 1810.2.5, although the 2009 IBC requires these provisions to be applied to all seismic design categories. 12.14 Simplified alternative structural design criteria for simple bearing wall or building frame system. In recent years, engineers and building officials have become increasingly concerned that building codes in general, and the seismic design provisions of those codes in particular, have become increasingly complex, difficult to understand and to implement. The basic driving force behind this increasing complexity is the desire to provide design guidelines that assure reliable performance of structures. Because the response of buildings to earthquake ground shaking is by nature very complex, realistic accounting for these effects leads to increasingly complex provisions. However, it has also been recognized that for buildings to be reliably constructed to resist earthquakes, it is necessary that designers have sufficient understanding of the design provisions to be able to properly implement them. In recognition of this, the SEAOC Seismology Committee developed, for inclusion in the 1997 UBC, a conservative, simple method of determining design forces for certain simple buildings. This procedure, in slightly a modified form, was adopted into the 2000 IBC and appeared with some slight modifications in the 2003 IBC. 148 2009 IBC Handbook