考虑多点输入的桂松干渠渡槽地震响应分析OA北大核心

When the span of aqueduct is large,there is correlation between the ground motion frequency and phase of each support,so it is necessary to consider the influence of the coherence change on the structure in seismic response analysis.This study focuses on the Dapo aqueduct of the Guisong Trunk Canal in central Guizhou,examining the dy-namic response of the aqueduct structure under synthetic wave and multipoint excitation,considering the spatial vari-ation of ground motion.The fluid-structure interaction between the water body and the aqueduct walls was simplified using the Westergaard additional mass method.A fluid-structure coupling dynamic analysis model was then developed to calculate the displacement and offset of the aqueduct structure under both empty and full water conditions,followed by damage assessment.The results show that the aqueduct experiences significant transverse displacement when filled with water during an earthquake,although most of the structure remains in an elastic state.Large-scale plastic dam-age occurs in the supporting columns at both ends of the aqueduct,with some reinforcement at the bottom yielding,yet the deformation meets relevant specifications.Under uniform excitation,the supporting columns at both ends show extensive plastic damage,while other columns are less affected.By contrast,under multipoint excitation,all support-ing columns exhibit large-scale plastic damage.Both excitation types cause concentrated plastic damage at the contact points between the aqueduct bottom and trough pier,as well as at the joints between the trough and the beam.The study reveals that damage areas at the joints between the aqueduct body and the beam,the trough body and the pier,and the supporting columns are larger under multipoint excitation,with greater vertex displacement offset observed.