Optimization Of Double Thin-wall Pier Of Continuous Rigid-Frame Bridge Based On Reliability

An ideal structure should be designed in such a way that its performance is satisfied during the designed working life and in an economic way. Optimization based on reliability should be considered a more rational design philosophy because of its rationality. It's integration of optimization and reliability analysis.Continuous rigid-frame Bridge meets the demands of large span and forcing requirement. Its construction proves to be easier without bearing, and it makes vehicles run smoothly because of expansion joint's absence. So, Continuous rigid-frame bridge enjoys its popularity. Among various kinds of high piers, double thin-wall pier can improve flexural rigidity, allows much bigger longitudinal displacement, and provides better lateral torsional strength. It appears aesthetic, but the design is harder. Always the parameters are chosen by experience subjectively.This thesis firstly reviews current approaches of optimization of double thin-wall pier, then studies design method of double thin-wall pier, and discusses the forcing state of the most dangerous, requirements of its longitudinal thrust-resistance and bending resisting rigidity, the buckling stability, the influence of the tie bars between the double thin walls. After that, this thesis studies the reliability analysis and the optimization design based on reliability theory, and stresses the specific methods which the program ANSYS uses. Finally, the double thin-wall pier's geometrical parameters of a continuous rigid frame bridge are optimized by the above approach, and then the double thin-wall pier's reliability probability is analyzed.