整桥-温度-重载耦合作用下钢桥面黏结层力学分析

建立了整桥鱼脊骨模型和基于复合材料层合板单元的铺装层体系计算模型.首先分析了整桥应力场及局部梁段的温度场对防水黏结层的作用效应以及最不利工况,然后得到黏结层在重载、整桥应力场及日照温度场耦合作用下的最不利层间剪应力.计算结果表明:整桥应力场作用时,黏结层在受扭梁段受层间横向剪应力为主,而在受弯及受拉梁段受层间纵向剪应力为主;当日照温度场作用时,受层间横向剪应力较大;重载作用下,黏结层层间横向剪应力明显大于纵向剪应力,且与荷载集度呈线性关系.在整桥-温度-重载多场耦合作用下,分析得到黏结层的最不利受力状态,并基于贡献率的概念,分析了整桥应力场、日照温度场及车辆荷载各自对黏结层层间剪应力的贡献情况.车辆荷载作用对黏结层层间横向剪应力的贡献率仅为80.1%,对黏结层层间纵向剪应力贡献率为89.3%.

Mechanical analysis of waterproof bonding layer on steel bridge deck under bridge-temperature-load coupling effect

The whole bridge model and the pavement calculation system based on the composite solid element theory are built.Firstly,the forces and deformations of main beam in the whole bridge model and the temperature fields of local steel box girder are analyzed.Then,the mechanical responses of the waterproof bonding layer under heavy loads,whole bridge stress fields and sunshine temperature fields are respectively calculated.The results show that under the effect of whole bridge stress fields,the waterproof bonding layer mainly recieves transverse maximum interlaminar shear stress in the local steel box girder subjected to torsion and longitudinal interlaminar shear stress in the box girder subjected to moment and axis forces.Besides,the transverse maximum interlaminar shear stress of the waterproof bonding layer is larger than the longitudinal maximum interlaminar shear stress under the heavy loads and temperature fields and is linear with the load quantity.Based on the concept of contribution rate,the contribution of whole bridge stress field,sunshine temperature field and vehicle load to interlaminar shear stress are analyzed.The vehicle load’s contribution to the maximum transverse interlaminar shear stress is only 80.1% while its contribution to the longitudinal maximum interlaminar shear stress is 89.3%.