Analysis of Seismic Response of Deck Concrete-filled Steel Tube Arch Bridge in Deep Cutting Gorge Area
Taking the Dongxi river bridge as an example,the spatial plane strain site model is established according to the real topography of the bridge site,and the finite element space dynamic calculation model of the whole bridge is established,and the seismic response of the structure under the uniform excitation analysis and the non-uniform excitation considering the site effect is compared by linear time history analysis,to explore the seismic problem of the deep canyon topography on the bridge structure system considering the site effect.The results show that:1)The site effect amplifies the ground motion at the arch foot position on both banks,and the ground motion on the south bank is greater than that on the north bank,and the site effect will increase the failure ability of short-period structures under earthquake.2)The site effect also has a certain amplification effect on increasing the bending moment of the arch leg,1/4 arch rib and vault on the arch rib,and the axial force of the arch rib is not obvious,and the vertical displacement of the arch rib is significantly amplified under the site effect.3)The amplification law of the site effect on the internal force and displacement response of the handover pier and the arch column under seismic response is basically the same,but the low pier is more sensitive to the site effect.
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