A Microcomputer CAD System for Seismic Design of Regular Highway Bridges

by M. Saiidi, Univ of Nevada, Reno, NV, USA,
D. R. Orie, Univ of Nevada, Reno, NV, USA,
B. M. Douglas, Univ of Nevada, Reno, NV, USA,



Document Type: Proceeding Paper

Part of: Electronic Computation

Abstract: A microcomputer program to implement the recent seismic design guidelines for highway bridges is described. The methodology was developed by the Applied Technology Council (ATC) and is for bridges with no abrupt change of mass or stiffness along their lengths. The program was written in FORTRAN 77 using an IBM PC-XT and was used for a sensitivity study of a five-span reinforced concrete bridge. The object of the analysis was to identify important boundary elements which influence the pier forces significantly. The study showed that (1) the pier foundation rotational stiffness about the longitudinal axis of the bridge and (2) the shear stiffness of the bearing system at the abutments were the two more critical parameters.

Subject Headings: Seismic design | Bridge design | Highway and road design | Computer aided design | Highway bridges | Concrete bridges | Stiffening

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