大跨径钢桥UHPC-TPO超薄铺装新体系力学计算与分析

发布时间：2018-01-31 04:51

本文关键词： 大跨径钢桥桥面铺装力学计算有限元分析超高性能混凝土正交试验　出处：《北京工业大学学报》2017年05期 　论文类型：期刊论文

【摘要】：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.
[Abstract]:In order to study ultra-high performance concrete of ultra-high performance concrete. UHPC-Polymer concrete thin polymer overlay TPO (UHPC-TPO) ultra-thin surfacing system under different axle loads and horizontal forces. The finite element method is used to calculate the thickness of TPO pavement and the mechanical properties under load position. The results show that the maximum tensile stress and maximum tensile stress of TPO are increased with the increase of axial load. The maximum shear stress between UHPC and TPO increased significantly. The magnitude of horizontal force has a significant effect on the maximum interlaminar shear stress of UHPC-TPO. Increasing the thickness of TPO is beneficial to the stress of the structure. The maximum tensile stress of UHPC and the maximum tensile stress of TPO are less than their cracking strength under the unfavorable condition of considering overload 230% and emergency braking. The maximum shear stress between UHPC and TPO is much smaller than the interfacial shear strength.
【作者单位】：湖南大学土木工程学院;中交第四航务工程勘察设计院有限公司;中原环保股份有限公司;
【基金】：国家自然科学基金资助项目(51678229)
【分类号】：U416.2
【正文快照】： 目前,柔性铺装凭借其行车舒适、自重轻等优点被广泛应用于钢桥面铺装.然而,由于沥青混合料铺装(如:浇注式沥青混凝土、沥青玛蹄脂混凝土和环氧沥青混凝土等)在重载、高温等作用下容易出现铺装层开裂、车辙、层间脱空等早期病害[1-2],且柔性铺装材料刚度较低,无法解决钢桥面结

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