doi:10.3850/978-981-08-7920-4_S2-S53-cd

ABSTRACT

In order to analyze the seismic performance of the bridge for the Jin-bin Mass Transit after pierunderpinning, Midas Civil software is used in the simulation. The beamelements are employed to simulate the PRC girder bridge, piers and beams of the lattice girder. The roof and floor of the lattice girder are simulated by the plate element, and the beam and plate elements share the same nodes at the junction. The binding of soil on the piles is expressed by the soil spring, and the coefficients are calculated according to the various geology conditions. The responses histories of the piers are calculated due to Tianjin seismic wave whose acceleration peak value is 0.15 g. With comparing the calculated results, the maximum amplitude values of the piers at the longitudinal and horizontal direction decrease about by 80% after the construction, while the maximum bend moment values at the bottom of the piers increase by nearly 40%. The bend moment increase will not pose a threat to the safety because of taking advantage of some measures in the design and construction.

Keywords: Underpinning, Bridge, Pier, Seismic loading, Dynamic responses, Simulation.

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