3003 W CASINO RD BLDG 40-21 2018-09-21

November 19, 2007 G-PN 1 A-WRL-07-114 Page 2 It is CP&A's professional opinion that the crane replacement will have no significant effect on the lateral force resisting system. Our reasoning follows: 1. The total dead weight of the 40-21/22 Buildings (where the new equipment is being installed) are approximately 78,000 kips (kilo- pounds), including the existing crane equipment. The new equipment is BOE/ F" estimated to weigh approximately 40 kips more than the existing equipment. The resulting increase in dead weight is 0.05%, which is negligible. Thus, the impact on the overall lateral force resisting system will be negligible. 2. The total dead weight of the existing crane equipment in the 40-21/22 Buildings are approximately 960 kips. The total dead weight of the replacement plus existing crane equipment in the 40-21/22 Buildings are estimated to be approximately 1,000 kips. This is an increase of only 4%, which means that the resulting increase in forces to the roof-level lateral force resisting system will be less than the 5% allowance of IBC Section 1614.3. While it is easy to see that the proposed crane replacement will have an insignificant effect on the lateral force resisting system, proving the exception on an element-by-element basis (as required by IBC Section 1614.3) will be excessively costly and time-consuming for Boeing. This is because the 40- 21/22/23/24/31/32/33/34 Buildings recently underwent a complete voluntary seismic upgrade of the lateral force resisting system, which was completed in 2002. The seismic upgrade included the use of non-linear friction dampers at the 2nd floor to help "isolate" the upper structure from the ground motions and to dissipate some of the induced seismic energy. CP&A was intimately involved with all phases of the seismic upgrade from conception through completion. The analysis and design process for friction-damped buildings is costly and time-consuming. However, at the time of the seismic upgrade the engineering costs were relatively small compared to the total construction costs and proved beneficial to Boeing on both a total-cost and performance basis compared to conventional code-prescriptive methods. For this crane replacement project, we do not expect a full lateral analysis will yield any strengthening requirements. This is due to the small increase in mass compared to the overall building and crane system mass, as noted above. We estimate the engineering cost of fully "proving" compliance with the 2003 IBC lateral force provisions to be on the order of$200,000 to $250,000 or more, with no appreciable gain in seismic performance.