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� � <br /> PUBL/C WO/�/IfS <br /> MEMORANDUM <br /> TO: Deric Von Schlieder �j O 3 0 S - O ( Ci <br /> FRONI: Tony Lee <br /> DATE: June 30, 2003 <br /> SUBJECT: Regional Special Events Center <br /> Deric, <br /> This is a follow up regarding the ceiling system `clouds' in the ballroom space. We are <br /> concerned about the structural integrity of any particular cloud unit during a seismic <br /> event. <br /> • Uplift forces at the perimeter require further investigation. The bracing proposed <br /> is located up to four feet from the edge of a cloud. What keeps the perimeter <br /> runners (main and cross) in a rigid horizontal plane with the cloud? It is the uplift <br /> potential at the perimeter of a ceiling system that is the basis of the requirement <br /> for attachment to partitions. <br /> • The verticat load capacity has not been clearly designed. More information is <br /> necessary. <br /> • Th� analvsis should demonstrate that the flexible construction of the ceiling <br /> system is accounted for to create a rigid unified assembly. <br /> • The design may in fact be satisfactory as submitted, however the drawings and <br /> calculations are not sufficie�it to make this determination. An entire cloud should <br /> be submitted showing all connections, spacing and materials used. As this is a <br /> typically prescriptive product used in a non-typical application, we need further <br /> information to establish an equivalency. <br /> If you have any questions, please call me at (425) 257-8810. <br />