Seismic Performance Study And Vulnerability Analysis Of High-pier Long-span Continuous Rigid Frame Bridge Based On Different Pier Cross-section

High pier and long span continuous rigid frame bridge as an important part of transport network, their height and span piers have exceeded the limits of seismic design codes, and the current seismic study of high pier long span continuous rigid frame bridge, which the main pier is thin-walled hollow reinforced concrete piers. Using seismic study of concrete filled steel tubular laced columns is still relatively small, so carry on high pier long span continuous rigid frame bridge with two piers seismic performance and vulnerability analysis is necessary, through analysis and calculation, using more conducive to high pier long span continuous rigid frame bridge seismic performance of the bridge piers.In this thesis, the research object is FenHe Bridge, first, using OpenSees establish 10 m main bridge piers of the finite element model, using the displacement load approach to study the seismic performance of reinforced concrete hollow pier in under cyclic loads; according to the bearing capacity of the same section, using OpenSees establish model of 10 m laced columns, and at different axial compression ratio and a different way of lacing bar links, Compared with the thin-walled hollow concrete piers about the seismic performance, select laced column superior seismic performance of reinforced concrete hollow pier, then replace reinforced concrete thin-walled hollow piers, then study two bridges of seismic response of the main bridge piers.Using OpenSees establish the finite model of FenHe bridge, using the dynamic time-history analysis method, according to specifications input the 0.2 g peak acceleration of seismic waves Vertical bridge to motivate, draw the biggest response of the bridge seismic waves is El-Centro wave; secondly using OpenSees establish the finite element model of bridge with the laced columns main bridge piers, the material and the constitutive relations are the same, then using El-Centro wave respectively carry on longitudinal direction and Transverse direction for long high pier long span continuous rigid frame bridge with different main bridge piers.Using incremental dynamic analysis (IDA) research methods, according to FEMA351, defines the damage state pier section, select El-Centro wave on the main bridge piers two different continuous rigid frame bridge, into the vulnerability of the longitudinal direction of the bridge analysis and research of the seismic performance of the two bridges in the growing excitations.