复合式路面CRCP疲劳损耗临界荷位处荷载应力研究

建立CRC-AC复合式路面三维有限元模型,分析确定了横向裂缝中部是CRCP疲劳损耗临界荷位。研究了不同CRCP裂缝间距下,CRCP疲劳损耗临界荷位处的荷载应力随路面结构参数变化的规律,对路面结构参数的确定提出了相应的建议。最后对荷载应力建立的回归模型进行了分析,得到了回归模型的各项系数,通过检验表明回归系数均能通过检验,由此得到的CRCP荷载应力计算公式精度好,表达形式简单,使用方便,可满足工程设计和理论研究的需要。

Studies on Load Stress at Loading Position Critical to Fatigue Loss on CRCP Composite Pavement

A 3D finite element model for the CRC-AC composite pavement is established, and it is confirmed through analysis that the middle part of the transverse crack in CRCP is the critical position to fatigue loss. The law that the load stress at the loading position critical to fatigue loss varies with the structural parameters of CRCP is studied at different intervals of the cracks, with relevant proposals for confirming those parameters. Finally, analysis is made of the regression model to the load stress to obtain the coefficients of the model. It shows that all regression coefficients have passed the test, indicating the formula thus obtained for CRCP load stress calculation is precise , simple in the form of expression and easy in use, and can meet the need of engineering design and theoretical studies.