Abstract

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Title:: Seismic Damage Analysis and Control of Super Long-span Cable-stayed Bridges in Longitudinal Direction

Author(s):: XIE Wen; SUN Li-min; School of Architectural, Civil Engineering and Environment, Ningbo University

Keywords:: super long-span cable-stayed bridge; extreme earthquake; failure criterion; failure pattern; damage control strategy

Abstract:: Elastoplastic analysis method was carried out to investigate the seismic damage and failure modes of a trial designed cablestayed bridge with a main span of 1 400 m including floating system and elastic restrained system under various ground motion intensities. The influences of damage control strategies on damage control effect of cablestayed bridges were presented. The results show that the pylons and piers suffer from local failure and severe damage under extreme earthquake respectively, which are subjected to a typical failure mode with one plastic hinge. The damage control strategies with additional dampers have obvious effects on controlling seismic damage of the pylons and piers, which can effectively reduce the girder displacement in the longitudinal direction. Therefore, it is effective to improve the seismic performance of a trial designed cablestayed bridge so that its seismic performance can meet damage control targets with additional dampers based on the Park damage index.