Study On Aseismic Behavior Of Long-Span Continuous Beam-Arch Combination Bridge

Continuous beam-arch combination bridge is a composite structure system in which longitudinal beam is used as tie rod, beam and arch are rigid connected on the support. The external support condition of this kind of combianation bridge is the same as ordinary continuous beam bridge. There is only vertical force exists at the support. The arch's horizontal force caused by external load and dead load and continuous beam's axial force compose a self equilibrium system. The system decreases structural internal force and also avoids the traditional arch's dependence on the foundation condition. At the same time, arch is an artwork which can combine with the nature easily. The famous structure master-Lin Tongyan used to say that arch is not only a structure but also an artwork. Continuous beam-arch combination bridge is the crystallization of structure and building.The dissertiation introduces the current situation of the continuous beam arch and research status of seismic design, and takes Zhengjiaba double road super-large bridge as research object, and study the simulation method of arch rib, main girder, pier, support and pile foundation, and uses finite element software MIDAS Civil 2006 to establish full-bridge three-dimensional finite element model in order to do response spectrum analysis and time history analysis. The paper emphases on the beam, arch and pier's mechanical characteristics and displacement under the combination of longitudinal, horizontal, longitudinal and vertical seismic, horizontal and vertical seismic. Then makes a comparison of these two kind of methods.