Abstract
Buckling Restrained Bracings (BRBs) are widely used to improve the seismic behavior of buildings. They are employed for bridges as well, but their application in this respect is limited. BRBs can also be used as a function of the individual damper rather than the structural component or the bracing, in which case the device may be called a Buckling Restrained Damper (BRD). Yet, such application has not been explored much. There are quite a few bridges designed according to the old design codes in Japan. Their seismic resistance may not be satisfactory for the current seismic design codes. Against this background, the behavior of a steel truss bridge under a large seismic load was investigated by nonlinear dynamic finite element analysis. Some members were indeed found to be damaged in the earthquake. Retrofitting is needed. To this end, the application of BRD was tried in the present study: a parametric study on the seismic behavior of the truss bridge with BRD was conducted by changing the length, the cross-sectional area, the location and the inclination of BRD. The effectiveness of BRD was then discussed based on the numerical results thus obtained. In all the analyses, ABAQUS was used.
Highlights
Earthquakes are the biggest threat to bridge structures, and design codes have been revised after each natural disaster
The application of buckling restrained damper (BRD) was tried in the present study: a parametric study on the seismic behavior of the truss bridge with BRD was conducted by changing the length, the cross-sectional area, the location and the inclination of BRD
The seismic performance of those bridges needs to be assessed by the new seismic design code criteria
Summary
Earthquakes are the biggest threat to bridge structures, and design codes have been revised after each natural disaster. The effectiveness of the core length of the BRD has been studied previously, its influence on the seismic performance of the Generally, buckling restrained braces (BRBs) have been considered as part of a bracing system, rather actual or the existing bridge under real earthquake conditions has not been assessed. The damper ‘BRD’ and the design parameters such as the length, the cross-sectional area, the location, and the inclination of BRD bracing ‘BRB’ are identical in terms of behavior and the design They belong to the metallic damper that on the seismic performance of an existing steel truss bridge. In order to enhance the seismic behavior of bridges using BRD, design parameters such as
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