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410B.1 Minimum Design Lateral Forces. Buildings shall be analyzed to resist minimum lateral forces assumed to act nonconcurrently in the direction of each of the main axes of the structure in accordance with the following:
V = 0.10 W (4B-3)
EXCEPTION: The lateral forces need not exceed those prescribed by San Francisco Building Code
Section 1613.
For buildings more than one story in height, the total force shall be distributed over the height of the building in accordance with the procedures of San Francisco Building CodeChapter 16.
For the purpose of this chapter, a dynamic analysis need not be performed for those buildings with irregularities, as defined in ASCE 7-10 Table 12.3-2 and ASCE 7-10 Table 12.3-1 which would otherwise require such analysis. All other design and analysis requirements of those tables shall apply.
410B.2 Lateral Forces on Elements of Structures. Parts of structures shall be analyzed and designed as required in San Francisco Building Code
Chapter 16
.
EXCEPTIONS:
1. Unreinforced masonry walls for which height-to-thickness ratios do not exceed ratios set forth in Table 4B-B need not be analyzed for out-of-plane loading. Unreinforced masonry walls which exceed the allowable h/t ratios of Table 4B-B shall be braced according to Section 413B.5.
2. Parapets complying with Section 413B.6 need not be analyzed for out-of-plane loading.
3. Out-of-plane anchorage of the walls shall be designed to 0.3 times the mass of the wall.
410B.3 Shear Walls (In-Plane Loading). Shear walls shall comply with Section 412B.
410B.4 Chords. When required by the structural analysis, chord forces of horizontal diaphragms shall be developed in existing materials or by the addition of new materials.