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24.85.055 Structural Systems Damaged by Catastrophic Events.

(Added by Ordinance No. 170997;  amended by Ordinance Nos. 178831 and 187192, effective July 17, 2015.) 

A.  Building Lateral Load Resisting systems along any principal axis damaged less than or equal to 50 percent. 

1.  If a building is damaged by a catastrophic event such that less than or equal to 50 percent of the capacity of the existing lateral load resisting system along any principal axis of the building are damaged, only the damaged lateral load resisting components of the building’s structural system must be designed and constructed to current provisions of the OSSC.  These components must also be connected to the balance of the undamaged lateral load resisting system in conformance with current code provisions.  Undamaged components need not be upgraded to current lateral load provisions of the current code, unless required by other provisions of this title.

2.  New lateral system vertical elements must be compatible with any existing lateral system elements, including foundations. In multistory buildings, the engineer shall confirm that the new lateral system vertical elements do not introduce soft or weak story seismic deficiencies, as defined by ASCE 41, where they did not previously exist, or make existing conditions more hazardous.

B.  Building Lateral Load Resisting systems along any principal axis damaged more than 50 percent.  Where a building is damaged by a catastrophic event such that more than 50 percent of the capacity of the existing lateral load resisting system along any principal axis of the building is damaged, all lateral load resisting components of the entire building’s structural system along that principal axis must be designed and constructed to the current provisions of the OSSC or ASCE 41-BPON improvement standard.