This paper focuses on the determination of section properties of latticed members for seismic retrofit of the San Francisco–Oakland Bay Bridge. To consider actual section integrity for a latticed member, the concept of reduction factors βm for moment of inertia and βt for torsional constant is introduced to account for the shear flow transferring capacity of lacing bars or battens and their connections. A set of formulas is proposed for calculating section properties required for seismic analysis and capacity determination. The validity of the proposed section properties is confirmed by a finite-element analysis of a latticed member. It is found that the proposed simple procedure closely resembles the finite-element analysis results. The proposed method is also supported by the recent 1/2 scale model test of the SFOBB laced member at UNR.
Section Properties for Latticed Members of San Francisco–Oakland Bay Bridge
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Section Properties for Latticed Members of San Francisco–Oakland Bay Bridge
Abstract
Authors
Sr. Bridge Engr., California Dept. of Transp., 1801 30th St., Sacramento, CA 95816; Prof. of Struct. Engrg., Taiyuan Univ. of Technol., Taiyuan, China.
Received: April 21, 1997
Published online: May 01, 2000