Elastoplastic Analysis On Substructure Of Long-span Bridge With Hydrodynamic Pressure During Earthquake

After stepping into the twenty-first century, economic prosperity has led tothe development of transport. Construction of long-span bridges also faceshigh-speed development both in and abroad. As China is an earthquake-pronecountry (located between two major seismic zones), the seismic analysis isinevitable when designing bridges. Under earthquake, hydrodynamic pressure willaffect the dynamic response of the infrastructure of bridge, which in turn has agreat impact on the entire bridge. Therefore, considering hydrodynamic pressurewhen analyzing dynamic response of the bridge substructure come as animportant issue.The content of the thesis includes five following parts mainly:(1) In order to study how water size affects hydrodynamic pressure, arectangular pier was created with variational water size. Within the range ofelastic response, the acceleration response, the displacement response and thehydrodynamic pressure along the pier were studied.(2)6classic seismic waves from Japanese anti-seismic code were adopted asthe load waves respectively. The different dynamic responses of pier werecompared between the6different seismic waves.(3) The southern pier of Nanjing Third Yangtze River Bridge was taken as anexample to compare the different results from Morison equation method and finiteelement simulation method.(4) Dynamic responses of the southern pier of Nanjing Third Yangtze RiverBridge were studied within the plastic range based on Morison equation method.The differences between results of elastic and plastic analysis were compared.(5) Performance-based seismic design was conducted to analyze howhydrodynamic pressure affects lower part of bridge. A simple method was putforward to analyze the influence of hydrodynamic pressure on dynamic pressureof the lower part of bridge.