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Eugene City Hall R32.19.04 Rev. B. September 9, 2003 <br /> <br />2.3 Non Structural Systems <br /> <br />Each of the four office wings at the main level includes a HVAC mechanical room. Each <br />room includes similar quantities and types of equipment. Figure 2-15 shows the vibration <br />isolation spring mounts used for the HVAC fans in the southeast wing. This style of <br />vibration isolation mount is highly susceptible to toppling under moderate levels of <br />lateral ground motion. These units should be replaced with suitable seismically-designed <br />isolation mounts; or at a minimum suitable heavy angle snubbers can be added (bolted to <br />floor, free from the equipment) to prevent excessive lateral movements (1/8" to 1/4" or <br />so) of the equipment. <br /> <br /> Figure 2-15. Vibration Isolation Mounts <br /> <br /> The HVAC fan equipment in the other HVAC rooms were mounted using rubber pad- <br /> type isolation mounts (Figure 2-16). These types of mounts are less vulnerable to seismic <br /> loads than those in Figure 2-15; however, the addition of low-cost snubber restraint <br /> angles is prudent, unless it can be shown that the light bolts can withstand the lateral <br /> loads from Z=0.3g, including bending and shear, while remaining nearly elastic. <br /> <br /> G&E Engineering Systems Inc. Page 13 <br /> <br /> <br />