1673-159X

CN 51-1686/N

QIN Chang, LIU Jincheng, XU Lueqin, LI Lin. Modal Pushover Analysis of Seismic Demand for Large-span Continuous Rigid Frame Bridge with High Piers[J]. Journal of Xihua University(Natural Science Edition), 2016, 35(6): 57-63. DOI: 10.3969/j.issn.1673-159X.2016.06.012
Citation: QIN Chang, LIU Jincheng, XU Lueqin, LI Lin. Modal Pushover Analysis of Seismic Demand for Large-span Continuous Rigid Frame Bridge with High Piers[J]. Journal of Xihua University(Natural Science Edition), 2016, 35(6): 57-63. DOI: 10.3969/j.issn.1673-159X.2016.06.012

Modal Pushover Analysis of Seismic Demand for Large-span Continuous Rigid Frame Bridge with High Piers

  • Based on the mode decoupling method of multi-degree-of-freedom systems in structural dynamics, modal pushover analysis (MPA) was proposed to be used in the seismic performance evaluation of large-span continuous rigid frame bridges with high piers. In combination with the design spectrum in current Chinese code, the OpenSEES platform was adopted to establish the nonlinear fiber analytical model for a large-span continuous rigid frame bridge with high piers. The MPA method and time history method were compared in estimation of seismic response of the bridge. The results showed that the MPA produces relative large errors in determination of the pier shear forces, especially in the longitudinal direction with the maximum error of 34.73%. In the transverse direction, the MPA method can be used in engineering practice and the maximum error is 26.48%. The MPA method leads to results of pier moment and displacement, which are very close to those of the time history method in both longitudinal and transverse directions. And the calculation precision satisfies the requirements of engineering practice. The analysis results show that the MPA method can be used directly to evaluate with satisfactory accuracy the transverse performance of continuous rigid frame bridges with high piers. While applying this method to assess the longitudinal performance, special attention needs to be paid to the influence of calculation error in shear demand on the final assessment results.
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