基于病害控制的钢桥面力学响应分析

Mechanical Response Analysis of Steel Bridge Deck Based on Disease Control

针对中小跨径钢桥面刚柔复合铺装层裂缝和刚柔层层间破坏问题,提出铺装层表面拉应力和刚柔层层间剪应力的力学控制指标,应用有限元软件ANSYS建立局部分析模型,分析不同位置荷载下的力学响应,从而确定最不利荷载位置,研究超载以及制动力对剪应力的影响。结果表明:以铺装层层间最大纵向剪应力和最大拉应力作为刚柔复合铺装层设计控制指标时,最不利荷位横桥向是U形肋中心上部,纵桥向分别是1/4跨和跨中位置;严格控制车辆载重和汽车制动力会减少刚柔复合铺装层破坏的可能性。

For the crack of rigid-flexible composite pavement of small and medium span steel bridge deck and the soft interlayer damage problem,put forward the pavement surface tensile stress and firm soft interlayer shear stress control indicators.Using finite element software ANSYS to establish local analysis model and utilizing analysis of mechanics response under different load position,so as to determine the most unfavorable load position,to study the effect of overloading and braking force on the shear stress.The results show that when the maximum longitudinal shear stress and the maximum tensile stress are used as the design control index of the rigid-flexible composite pavement,the most unfavorable load position is the upper part of the U rib center,and the longitudinal load position is 1/4 span and the middle span respectively.Strict control of vehicle load and braking force will reduce the possibility of rigid-flexible composite pavement damage.