Abstract
The continuous girder bridge is the main type of small- and medium-sized bridges; however, it has poor collapse resistance and suffers frequent earthquake damage. In order to grasp its collapse mechanism and clarify the internal and external factors affecting its collapse resistance, a 1:3-scaled, two-span bridge model subjected to shaking table test research was taken as the research object. The factors such as seismic characteristics, multi-directional seismic coupling, span, pier height, and structural system type were analyzed to determine the influences on the collapse mode of the bridge. The numerical results showed that different ground motion characteristics led to different collapse modes. Vertical ground motion had little effect on the structural response of the bridge. The change of span and pier height significantly changed the collapse resistance. A seismic isolation design could improve the anti-collapse performance, but the collapse mode varied with the system. The final anti-collapse design suggestions could provide reference for the seismic reinforcement of existing continuous girder bridges and the seismic design of continuous girder bridges that will be constructed.
Highlights
The continuous girder bridge is the main type of highway bridge, its structural form is simpler than that of long-span bridges
The test bridge models included the conventional system of ordinary rubber bearings and the isolation system replaced by high damping rubber (HDR) bearings
The collapse modes of the same type of ground motion input were basically similar
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Hu et al developed the simplified rigid surface coupling method to analyze the collapse of Gaoyuan Bridge in the Wenchuan earthquake, and found the oversize longitudinal displacement caused the girder falling [26]. These scholars have revealed the collapse mechanism of specific girder bridges, but their conclusions cannot be extended to other bridges. Considering that there is little research on collapse mode of continuous girder bridges, the collapse mechanism and the influencing factors of the collapse was our main study. This paper presents further research on the above problems and tries to reveal the critical factors leading to the collapse of a two-span continuous girder bridge. The design suggestions for the bridge are put forward, providing a reference for the seismic design of bridges that will be built and the seismic reinforcement of existing bridges
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