01_STRUCTURAL_CALCS.pdf

This is a structural calculations document prepared by Murashige & Onishi Engineering Co. for the Department of State Hospitals' Generators Stack Extension project located at 2100 Napa Vallejo Highway in Napa, CA. The document details the structural analysis and design calculations for extending an existing generators exhaust stack by 12'-6", including vertical and horizontal support components. The project received approval from the Office of the State Fire Marshal on June 12, 2024 (approval #24-1374), with structural calculations dated April 20, 2023.

The document includes detailed engineering calculations for wind loads, seismic criteria, foundation design parameters, and steel member analysis using RISA-3D software. The stack extension uses HSS6X6X6 steel tube columns and beams, with a concrete foundation mat designed for 1,500 psf bearing pressure on compacted sandy clay soil. Wind analysis shows a basic wind speed of 100 mph, and seismic calculations conform to ASCE 7-16 standards. The structure incorporates both dead loads and seismic loads in the analysis, with detailed node coordinates, boundary conditions, and member properties provided for all structural components.