Finite element analysis of the aseismicity of a large aqueduct

摘要

Finite element analysis has been applied to a large aqueduct to investigate the efficiency of lead rubber bearings (LRBs) in reducing the effects of earthquake shocks. Theoretical relationships have been derived for dynamic interaction of a coupled fluid-solid system such as an aqueduct. A numerical program has been developed by considering the coupled fluid-structure dynamics between the water in the aqueduct and the side wall of the aqueduct and the bilinear deformation characteristics of LRB. The numerical analysis shows that the incorporation of LRBs is a valuable technique in creating aseismicity for a variety of conditions. Since aseismic efficiency varies with LRB type, it is feasible to have an optimal design. The analyses show that LRBs work best with large earthquakes, however, the displacement of the trough sat on top of the LRBs is enhanced so the design of joints within the aqueduct needs special attention.