大跨径钢桥UHPC-TPO超薄铺装新体系力学 计算与分析

为了研究超高性能混凝土(ultra-high performance concrete,UHPC)-聚合物混凝土薄层铺装(thin polymer overlay,TPO)超薄铺装体系在不同的车辆轴载、水平力大小、TPO铺装层厚度、荷载位置下的力学性能,采用正交试验设计进行有限元计算.研究表明:随着轴载增大,UHPC最大拉应力、TPO最大拉应力、UHPC与TPO层间最大剪应力均显著增大;水平力大小对UHPC-TPO层间最大剪应力影响显著;增大TPO厚度对结构受力有利;考虑超载230%且紧急制动的不利工况,UHPC最大拉应力和TPO最大拉应力均小于各自的开裂强度、UHPC与TPO层间最大剪应力远小于界面抗剪强度.

Mechanical Calculation and Analysis of the Newpaving System of UHPC-TPO Ultra-thin Layer on Long Span Steel Bridge

In order to study the mechanical properties of the ultra-high performance concrete ( UHPC )-thin polymer overlay ( TPO) ultra-thin paving system under different vehicle axle load, horizontal force, thickness of TPO and load positions, the orthogonal experiment designs and the finite element calculations were carried out. The results show that with the increase of axle load, maximum tensile stress of UHPC, the maximum tensile stress of TPO and shear stress between UHPC and TPO increase significantly. The effect of horizontal force on the maximum shear stress between UHPC and TPO is significant. Increasing the thickness of TPO is beneficial to reducing structure stress . Considering the adverse conditions of the overload of 230% and emergency braking, maximum tensile force of UHPC and TPO are both less than their respective cracking strength, the maximum shear stress of UHPC-TPO is much smaller than that of the shear strength of interface.