Abstract
This paper presents a copula technique for developing seismic fragility curves for an RC (reinforced concrete) isolated continuous girder bridge, by considering earthquake damage indicators such as bridge piers, isolated bearing components, and the main girder of collision damage. The results of this method are compared with those of the limit method of the first-order reliability theory. Meanwhile, the incremental dynamic analysis of the bridge structure under different failure conditions is carried out, and the randomness of the near-fault ground motion and the structural parameters are accounted. Based on the damage index of the isolated bridge under different damage conditions, the seismic fragility curves of each component and the whole isolated bridge are obtained. The research shows that the safety control of the isolated continuous girder bridge structure is mainly affected by the seismic fragility of the isolated bearing, the influence of bridge pier seismic fragility is relatively small, and the probability of beam collision in an isolated bridge is lower than that of a general bridge without isolation bearing. By applying the isolation scheme, the probability of different damage state of the bridge structure is greatly reduced, thus the seismic performance is improved. It also verifies the efficiency and superiority of copula technology. The results will provide a reference for future seismic damage prediction.
Highlights
The bridge is an important hub of transportation systems, especially the reinforced concrete long-span continuous girder bridge, the most common type on highways in China
An RC isolated continuous girder bridge was selected as the research object
In order to reasonably evaluate the seismic performance of the isolated bridge, considering the randomness of the near-fault ground motion and structural parameters, an incremental dynamic analysis of the bridge structure under different failure states was carried out
Summary
The bridge is an important hub of transportation systems, especially the reinforced concrete long-span continuous girder bridge, the most common type on highways in China. It has been noticed that the long-period velocity and displacement pulse motion of the near-fault ground motion may adversely affect the seismic performance and design of the bridge [1,2,3,4]. In order to effectively reduce the seismic damage to bridges, the isolation design of lead rubber bearing (LRB) is used in the actual engineering. Near-fault ground motion with strong non-stationary characteristics adversely affects the seismic performance and design of the isolated bridge through support shedding, displacement of expansion joints, excessive relative displacement of pier beams, and falling beams caused by the collision of the main beams. Evaluating the seismic performance of isolated bridges under near-fault ground motion is an important subject for study
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