The winged arch-beam composite system bridge is a new type of composite structure system with special-shaped structure.Compared with the conventional beam bridge,arch bridge and cable-supported system bridge,its dynamic characteristics are special.In this paper,a(56+164.5+35)m winged arch-beam com-posite system bridge in high intensity area was taken as an example.The finite element model was established,and the dynamic characteristics of the bridge under the conventional lateral restraint system were analyzed.The nonlinear time history analysis method was used to obtain the displacement and internal force response of the bridge under rare earthquakes.According to the response,a constraint scheme of"lateral sliding bearing+fluid viscous damper+limit block"was proposed.The calculation results showed that the lateral damping effect of the lateral sliding bearing+damper was good,which can significantly controlled the displacement of the superstruc-ture and improved the stress of the substructure.The block can be used as an additional anti-seismic measure to further limit the displacement of the main girder and avoid the damper exceeding the stroke.The research results can be used as a reference for similar bridge design.
High intensity areaArch-beam composite systemNonlinear time history analysisFluid vis-cous damperTransverse damping
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