Research on Seismic Performance of Continuous Rigid-Frame Bridge With Corrugated Steel Webs

Abstract eng:
Continuous rigid-frame bridge with corrugated steel webs combine the advantages of rigid-frame bridge and box girder with corrugated steel webs. Compared to traditional continuous rigid-frame bridge with concrete webs, it is a new structure with a large spanning capacity, light dead weight, high efficiency of prestressed steel and so on. Generally speaking, lighter dead weight of upper bridge structure will lead to the reduction of seismic actions. But for the continuous rigid-frame bridge, its seismic performance not only affected by its own dead weight, but also the pier-girder stiffness ratio and regularity of the bridge layout scheme. Therefore, this paper will discuss the characteristics of seismic performance of continuous rigid-frame bridge with corrugated steel webs and the impact of regularity of the pier arrangement on seismic performance. Firstly, based on the valley bridge in Japan, the FEA model of continuous rigid-frame bridge with corrugated steel webs and the corresponding continuous rigid-frame bridge with concrete webs are established with design principle of equivalent shear capacity of the girder cross-section. Through the seismic response spectrum analysis, for the case of irregularity of the pier arrangement as the real bridge, the displacements response of the main girder of rigid-frame bridge with corrugated steel webs is larger than the bridge with concrete webs, the seismic force of rigid-frame bridge with corrugated steel webs at the main girder and the lower pier are smaller than the bridge with concrete webs basically, but the seismic force of corrugated steel webs at the higher pier is larger than the concrete webs. In order to further analyze the impact of the regularity of the pier arrangement, the height of the piers are changed to the same, and then compared with the former irregularity situation. The results showed that: as to the regularity of the pier arrangement, the displacement response of the main girder of rigid-frame bridge with corrugated steel webs is still slightly larger than these of the bridge with concrete webs, but the internal force of the main girder and all piers of rigid-frame bridge with corrugated steel webs are smaller than these of the bridge with concrete webs. So the seismic performance of continuous rigid-frame bridge with corrugated steel webs is better than the bridge with concrete webs on the whole, while adverse effects caused by irregularity of the pier arrangement should be paid more attention in the design of a specific real bridge.

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