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'..I..r �F' .. <br /> i. r .., . . . _ . '.:I:P':_F ii.. .a_ , u . <br /> � The Bocing Company <br /> � P.O.Boe 7707 <br /> Soahle,WA 90/242207 '1 <br /> �L(L'U'-) -l� .Z� <br /> December 13, 2005 i,,,,, o � <br /> GI'NPP-�5-1214 Poat-IPFex Noto 7s7t � y,.,, coaa+ L <br /> , To � � �I�N. Fro �� �S�'�nr.�i+� <br /> �� CalDnJt.r /. � G�" Co. � <br /> CTl i !i• <br /> 1'ony Lee ' rna,e. r"���• r ac/'' <br /> Ci�yof'L-'vcrett �°•" �s'7�P�"I�L F°`� <br /> 13uilding Dcp.irtmem <br /> 3200 Ccdnr Strcct <br /> Lvcrctt, \VA 9R201 <br /> 6-'_". <br /> BOE/NG I30F.ING 45-03 BUILUIN(: A1:1'1?ItA'I'IONS — PKOI'OSI�:U 1;S13 (H� Il?I3C <br /> Uear'I'ony, <br /> � The City af Gverctt'c adoption of the 2003 I13C docs not :ippcar to implement Ihc <br /> iuse of the 2003 lli13C for alteralions ta cxisting structures. 1'Vc reyuesl that thc <br /> City of}:vcrcu allu�+� Bocing lo usc thc 2003 ILI3C for thc structural decign <br /> ��orlions of Ihe subject building alterations. This changc is justified for the <br /> f'ollowing rc:�sons: <br /> I. 'I'hc tuial wci�ht ol the building <br /> (slructural+mechanicaHclecuicaNarchitectur,d+cranes) is being rrduccd by <br /> morc th.m 3%, from 4G40 lons down to=1492 lons. Most of thc nct µ�cight <br /> reduclion occurc in Uie atGc irea. 'I'his reductiun will result in a lower overall <br /> scismic basc shear. "fhc 2003 ICQC docs not reyuire an upgradc of thc <br /> c��mplelc latersl furce rcsisting system if the seismic bnse shear docs not <br /> inrirase by morc lhan 5�'n due to thc :4terations.. <br /> 2. Thc cxisting buildin� uscs a tension-only lateral force resisting systcm. This <br /> typc of systcm h.is a poor perfonnance histury during design-level events. Pcr <br /> the 2003 1[3C, upgr:�ding this sys�em for full conforniancc ro thc 2003 II3C is <br /> I not required if wc can show U�at �he scismic stress in rxisting huilding <br /> smictural elements �ues nol increase by mure than 55'o due to the .�Ilerations. <br /> � 'I'his cm�lysis has bccn cotnplrled, with interesting results. lf wc dcnom .in�� <br /> rlemcnt with a seisiuic stress of 5 ksi or Icss as "lightly loaded," ���c find thc <br /> fullo�+'in:; <br /> Check of Seismic Furce Rcsisting System <br /> 6lement Stresses in Allered Buildin <br /> � Li hU Loaded Hcavil Loaded Total <br /> > I.OS chan c 271 95 3GG <br /> < I.OS chn�e 539 1G2 701 <br /> -- 11,ta1 F 10 257 10C,7 <br /> I �— <br />