Seismic Response Analysis of Bridge Pier with Different Superstructure in Mountain Area
In order to improve the seismic ability of bridge structure and ensure the normal operation of the structure,the difference of seismic response of prestressed concrete T-beam and steel-concrete composite beam on bridge pier in mountain area is studied.Firstly,a fine finite element model is established.The upper structure is modeled by the beam lattice method,and the lower structure considers the common structural forms of mountain pier,including column abutment,gravity abutment,column abutment and solid abut-ment.Based on the response spectrum method,the seismic response difference of the two types of superstructure to the bridge pier is analyzed.The results show that the difference of the overall structural dynamic response of the prestressed concrete T-beam and steel-concrete composite beam is mainly reflected in the first-order vibration mode,and the period of T-beam bridge is longer than that of steel-concrete composite beam bridge.The seismic response(bending moment,shear force,pier top displacement and axial force)caused by T-beam to pier shows a trend of greater than that of steel-concrete composite beam,and the difference is mainly reflected in the pier under fixed constraints.The yield analysis results show that the pier structure under the action of T-beam and steel-con-crete composite beam is in elastic state under E1 and E2 seismic load,and does not reach the yield strength.
mountain bridgesprestressed concrete T beamsteel-concrete composite beamseismic response
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