Seismic reliability analysis of random parameter aqueduct structure under random earthquake

Based on concrete continuum damage mechanics and probability density evolution theory, a random parameter structure model, a random ground motion model, and a parameter-excitation composite random model were established to realize the seismic response analysis and seismic reliability analysis of random parameter structures under random ground motions. Taking a large reinforced concrete aqueduct structure as the research object, carry out its random structural seismic response analysis, random seismic response analysis and compound random seismic response analysis. The displacement angle of the channel pier is used as the absorbing boundary condition, and the probability density evolution method is used to obtain different threshold conditions. The seismic reliability index of the lower aqueduct structure. And through system comparison, it is found that the compound random action will further amplify the seismic response of the aqueduct structure, make the failure form of the aqueduct structure more significant variability, and reduce the seismic reliability of the aqueduct structure. The proposed analysis framework and method will provide an important reference for seismic analysis and reliability analysis of aqueduct structures.