SEISMIC DEMAND OF BUCKLING-RESTRAINED BRACES INSTALLED IN STEEL ARCH BRIDGES UNDER REPEATED EARTHQUAKES

Author:

CHEN XI1,GE HANBIN2,USAMI TSUTOMU2

Affiliation:

1. Department of Civil Engineering, Nagoya University, Nagoya, 464-0814, Japan

2. Department of Civil Engineering, Meijo University, Nagoya, 468-8502, Japan

Abstract

A steel arch bridge originally designed against moderate earthquakes is retrofitted by installation of buckling-restrained braces (BRBs) to sustain severe earthquakes. Two retrofitting methods are considered to obtain good seismic performance of this arch bridge. The original model and retrofitted models subjected to the major earthquakes are investigated by dynamic analyses using 12 patterns of severe (level 2) earthquakes as input ground motions. It is found that the retrofitted models using BRBs can greatly improve seismic performance (displacement, section force, strain, reaction force, etc.) of the steel arch bridge. In addition, to investigate the influence of repeated earthquakes on the seismic responses of the main structure and the demands of BRBs, 12 patterns of earthquake ground motions are repeated by three times. Based on the analytical results, the seismic demands of BRBs against repeated earthquakes are obtained, and the required capacity of BRBs is recommended using a safety factor concluded by comparing the demands under the earthquake applied one and three times. Finally, the influence of the different yield stress on the demand of BRBs is examined by changing the steel grade of BRBs.

Publisher

World Scientific Pub Co Pte Lt

Subject

Geophysics,Geotechnical Engineering and Engineering Geology,Oceanography

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