基于剪切性能的钢桥面STC铺装组合结构优化研究

Research on Optimization of Composite Structure of STC Pavement on Steel Bridge Deck Based on Shear Performance

通过调研我国不同地区钢桥STC铺装工程应用情况,发现主要病害为磨耗层推移,分析认为STC铺装与磨耗层层间抗剪强度不足是产生推移的主要原因。针对该问题,通过数值分析及物理试验,对铺装组合结构厚度、模量进行优化设计,并回归出层间剪应力计算公式。结果表明,合理控制STC铺装层和磨耗层的模量,且STC铺装厚度不低于45 mm、磨耗层厚度不小于35 mm的组合可有效减小层间剪应力。工程案例应用分析表明,回归计算公式所得结果与有限元计算结果相差在10%内,可用于STC铺装层间剪应力预估。

It is found that the main disease is the wearing layer trasition,by investigating the application of steel bridge STC pavement projects in different regions of China.The analysis showes that insufficient shear strength between the STC pavement and the wearing layer is the main reason for the transition.In response to this problem,optimal design is done to the thickness and modulus of pavement composite structure,and interlayer shear stress calculating formula is regressed by numerical analysis and physical experiments.The results show that reasonable control of the modulus of STC pavement and wear layer,and STC pavement thickness not less than 45 mm and wearing layer thickness not less than 35 mm can effectively reduce the interlaminar shear stress.Analysis of engineering cases shows that the difference between the regression formula in this paper and the finite element calculating result is no more than 10%,and it can be used to estimate the shear stress between layers of STC pavement.