Shaking Table Test Study on Seismic Performance of Concrete Arch Bridge With Steel Web

Abstract eng:
Concrete arch bridge with steel web plate is a new type of composite bridge, of which the main arch ring consists of concrete top plate, bottom plate, and corrugated or plane steel web. This new structure has advantages of light-weight, convenient construction, and consequentially, extending the span of concrete arch bridge. In this study, three concrete arch model experiments in scale 1:14.5, including one conventional reinforced concrete (RC) arch model based on a practical project and two trial designed concrete arch models with corrugated steel web (CSW) and plane steel web (PSW), have been carried out to investigate the natural modes and seismic response by the Earthquake Simulation Triple Shaking Tables System at Fuzhou University. The first order natural frequencies of the arch models in the in-plane and out-plane directions were reduced by replacing the RC web with CSW and PSW webs due to the loss of the integral rigidity of the arch models; Under the transverse seismic excitations, the RC-CSW arch model presented the largest displacement response and outplane acceleration magnification coefficients among the three arch models; Under the longitudinal seismic excitations, RCCSW and RC-PSW arch models showed slightly larger displacement responses and in-plane acceleration magnification coefficients than those of RC arch model; As the PGA of longitudinal seismic excitations increased, a large number of cracks gradually occurred in the arch springing of RC arch model whereas the RC-CSW and RC-PSW models were still in elastic working stage. The maximum strain of RC arch model was approximately 1.5 times larger than the other two models. It is believed that the replacement of RC web with CSW or PSW can reduce the internal force of arch bridge.

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