Abstract
Curved beam bridge is a kind of irregular structure, which has the advantage of adapting to complex terrain, but it is more vulnerable to damage than regular bridge under earthquake. This paper investigates the vulnerability of curved continuous girder bridges under the action of bidirectional earthquake horizontal earthquake, and the difference of vulnerability between side pier and intermediate pier is analyzed. Fragility assessment is performed using an incremental dynamic analysis method subjected to a wide range of as-recorded sequences. A proper engineering demand parameter (EDP) which can result in the most probability of failure at bridges employed in this study is determined. Result indicates that only considering the unidirectional seismic input will underestimate the seismic response and potential damage of the structure, which is not accurate for the seismic performance evaluation of the bridge. Result also shows that the damage probability of the intermediate pier of the curved bridge is higher than that of the side pier, and the more serious the failure, the smaller the difference between the two piers.
Highlights
In the Wenchuan earthquake, the large relative displacement at the expansion joint of Baihua bridge caused the upper structure of the fifth continuous beam to fall and break, resulting in the overall collapse of the structure[1]
This paper aims to evaluate the fragility curves of piers of curved bridges subjected to bidirectional earthquake
Where P is the probability of exceedance of the limit state based on ground motion intensity (IM), is the probability density function of a normal distribution, IM is the ground motion intensity indexes, such as peak ground acceleration (PGA) or spectral acceleration, LS is limit value of damage index for each failure state of structure, EDP is engineering demand parameter, EDP and LS are the log-normal standard deviation of structural seismic response and limit state of components, respectively; a and b are fitted parameter values
Summary
In the Wenchuan earthquake, the large relative displacement at the expansion joint of Baihua bridge caused the upper structure of the fifth continuous beam (with a radius of curvature of 66m) to fall and break, resulting in the overall collapse of the structure[1]. The seismic research of curved bridges began in 1971 when the San Fernando earthquake in Los Angeles caused the fall of two curved bridges on the interstate highway interchange. [3] and [4] respectively carried out detailed modeling analysis and shaking table test for the damaged double curve girder bridge, and put forward some suggestions for seismic design and calculation of curved bridge. The influence of curve radius and other factors on the seismic performance of curved bridges is studied by means of spectrum analysis or time history analysis[5] [6]. The influence of curve radius and other factors on the seismic performance of curved bridges is studied by means of spectrum analysis or time history analysis[5] [6]. [7] studied the influence of curve radius on the damping effect of viscous damper of curved bridge
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