Study on optimization design of orthotropic steel bridge deck based on response surface method
In order to comprehensively improve the fatigue resistance and economy of orthotropic steel bridge deck,the optimization design study of orthotropic steel bridge deck was carried out,with the design parameter of roof thickness,U-rib thickness,diaphragm thickness,and the target response of maximum tensile stress of U-rib fillet weld,the maximum compressive stress of diaphragm cope-hole,the maximum tensile stress of U-rib patching section,steel consumption per unit length.The most unfavorable load positions of different fatigue vulnerable parts were determined based on the finite element simulation.The multi parameter simulation analysis was carried out by the Box-Behnken test design method.The significance level of the influence of the design parameters on the target response was analyzed by the F-test method,and the simplified nonlinear response surface fitting equation of the target response was proposed.Finally,the multi-objective optimization expected function was constructed,and the target response was optimized.The results show that the optimization result was compared with the original design value,the maximum stress index of the structure decreases by 27.2％,the steel consumption per unit length decreases by 18.4％,and the fatigue resistance and economy are significantly improved.
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