01_STRUCTURAL_CALCS.pdf

This is a structural calculations document prepared by Murashige & Onishi Engineering Co., Inc. for the Department of State Hospitals Generators Stack Extension project located at 2100 Napa Vallejo Highway in Napa, CA 94558. The document outlines structural calculations for extending an existing generators exhaust stack by 12'-6", including vertical and horizontal support requirements. The calculations were approved by the Office of the State Fire Marshal on 06/12/24 under approval number 24-1374. The scope includes stack support framing and foundation design using RISA-3D software for analysis of wind, seismic, and dead loads on the structure.

The technical specifications show the stack extension has dimensions of 7'-4"L x 5'-4"W x 12'-6"H and weighs 11,500 lbs. The foundation design parameters specify sandy clay compacted soil with allowable bearing pressure of 1,500 psf at 2'-0" minimum into natural grade. The structural analysis includes wind speeds up to 92 mph, seismic parameters based on ASCE 7-16, and uses A500 Grade B steel for the structural members. The calculations demonstrate compliance with AISC 15TH (360-16) steel code requirements for member sizing and stress checks under various load combinations.