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Eugene City Hall R32.19.04 Rev. B. September 9, 2003 <br /> <br />The basis for development of the fragility data for these selected structures is past <br />earthquake experience data, calculations provided in (1995b), and judgment. <br /> <br />For each item for which fragility data was developed, two building states were <br />considered: <br /> <br /> Existing structure in its pre-earthquake condition <br /> <br /> Existing structure in its retrofitted condition <br /> <br />The fragility curves represent the damage attributable to the structural load beating part <br />of the building. <br /> <br />Structure Slight Moderate Major Collapse <br /> Case A Beta A Beta A Beta A Beta <br /> 1. As Is 0.08 0.60 0.12 0.60 0.20 0.60 0.40 0.60 <br /> 2. Upgraded 0.21 0.50 0.30 0.50 0.90 0.50 1.60 0.50 <br /> <br /> Table 5-3. Fragilities <br /> <br /> For equipment, the damage states are as follows: <br /> <br /> Suspended Ceiling. Extensive damage. Many panels fall. Adverse interactions <br /> with equipment above the ceiling tiles may occur. <br /> <br /> HVAC. Equipment displaces and is damaged. <br /> <br /> Desktop equipment, monitors. Item slides and falls off desktop / countertop and is <br /> likely damaged / non-functional. Upgrade precludes sliding and essentially <br /> eliminates the risk of damage. <br /> <br /> Electrical Panels (including motor control center). Unanchored / unrestrained <br /> panels rock and potentially topple. Possibly some components within the panel <br /> are damage. Upgrade prevents toppling. <br /> <br /> Pipes runs. Each run suffers some type of damage (sometimes leaks or breaks in <br /> pipe, sometimes excessive damage to support). Upgrade is to preclude breaks in <br /> pipe / conduit due to excessive seismic anchor movements <br /> <br /> Overhead Tanks. Excessive lateral movement distresses supports and puts <br /> excessive loads on attached pipes. Upgrade is to ensure that the tank does not fall <br /> and the loads on attached pipes do not cause them to break. <br /> <br /> Floor mounted tanks (and heat exchangers). Anchorage slips / breaks and allows <br /> tanks to move laterally / rock. Could lead to damage of attached pipes. Upgrade is <br /> to anchor / restrain the tanks to preclude their excessive movement. <br /> <br /> G&E Engineering Systems Inc. Page 32 <br /> <br /> <br />