// CODE SNIPPET
1620.2.5 Diaphragms
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Permissible deflection shall be that deflection up to which the diaphragm and any attached distributing or resisting element will maintain its structural integrity under design load conditions, such that the resisting element will continue to support design loads without danger to occupants of the structure.
Floor and roof diaphragms shall be designed to resist Fp as follows:
where:
Diaphragms shall provide for both shear and bending stresses resulting from these forces. Diaphragms shall have ties or struts to distribute the wall anchorage forces into the diaphragm. Diaphragm connections shall be positive, mechanical or welded-type connections.
Floor and roof diaphragms shall be designed to resist Fp as follows:
F p = 0.2 IESDSw p + Vpx
(Equation 16-60)
where:
| Fp | = | The seismic force induced by the parts. |
| IE | = | Occupancy importance factor (Table 1604.5). |
| SDS | = | The short-period site design spectral response acceleration coefficient (Section 1615). |
| wp | = | The weight of the diaphragm and other elements of the structure attached to the diaphragm. |
| V px | = | The portion of the seismic shear force at the level of the diaphragm, required to be transferred to the components of the vertical seismic-force-resisting system because of the offsets or changes in stiffness of the vertical components above or below the diaphragm. |
Diaphragms shall provide for both shear and bending stresses resulting from these forces. Diaphragms shall have ties or struts to distribute the wall anchorage forces into the diaphragm. Diaphragm connections shall be positive, mechanical or welded-type connections.
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