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采用有限元计算分析方法研究基于纹理特征的钢桥面铺装层早期开裂机理。基于9种典型荷位建立有限元模型,对比计算了铺装层竖向位移、横向拉应力(变)峰值;同时,通过对轮胎施加不同胎压和载荷,分析两者对铺装层竖向位移和横向拉应力的影响规律,并与均布载荷下的计算结果进行对比。结果表明:最不利荷位为两横隔板跨中与U形肋边交叉处,与均布载荷作用下结论一致;胎压从0.4增大到1.05 MPa,铺装层横向拉应力峰值较均布载荷下计算结果增大-36%~110%;轴载从25增大到50.8kN,胎/桥接触模型计算得到的铺装层横向拉应力峰值比均布载荷下的计算结果增大7%~20%。
Finite element analysis method is used to study the early cracking mechanism of steel deck surfacing based on texture features. Based on the nine kinds of typical charge, the finite element model was established, and the vertical displacement and the transverse tensile stress (peak) of the pavement were calculated. At the same time, by applying different tire pressure and load to the tire, Displacement and lateral tensile stress, and compared with the results under uniform load. The results show that the most unfavorable load is the cross between the two diaphragms and the U-shaped rib, which is consistent with the uniform load. When the tire pressure increases from 0.4 to 1.05 MPa, the transverse tensile stress peak value of pavement The calculated results increase by -36% ~ 110% under the load of cloth and the axial load increases from 25 to 50.8 kN. The tensile stress peak value of the pavement layer calculated by the tire / bridge contact model increases more than that under the uniform load. % ~ 20%.