水泥混凝土路面板断裂破坏过程分析研究

发布时间：2018-05-18 23:17

本文选题：水泥混凝土路面板 + 破坏　；参考：《重庆交通大学》2015年硕士论文

【摘要】：近年来,随着我国公路建设的发展,水泥混凝土路面的里程逐年增加,已建成的水泥混凝土路面中,结构完好的路面板强度高、稳定性好、耐久性好。但在开始出现断板、脱空、错台等病害后,后期破坏中路面板断裂发展的速率远大于病害出现初期,路面板结构完整性遭到破坏,承载能力降低,标准轴载累计作用次数减少,服役年限远远小于设计年限。本文针对这个问题作了如下研究:(1)单块水泥混凝土路面板断板后应力、弯沉的变化规律研究。针对地基板理论和ANSYS有限元分析的特点,建立了三维模型,并结合应力诺莫图验证模型的正确性。分析得出断板尺寸和弯拉应力、压应力、弯沉之间的关系。改变轴载在断板上的位置,考察其应力应变变化规律。最后,推导出单块路面板断板尺寸和标准轴载累计作用次数的关系,分析断板对断裂过程的影响。(2)多块水泥混凝土路面板脱空后应力、弯沉的变化规律和破坏规律研究。在单块路面板的基础上加入传力杆模型,建立板与板相互作用的三维实体模型。作脱空尺寸、脱空形态和路面板弯沉、弯拉应力的关系图,分析其作用前后变化规律。最后,推导出多块路面板脱空形态和标准轴载累计作用次数的关系,分析脱空对断裂的影响。
[Abstract]:In recent years, with the development of highway construction in China, the mileage of cement concrete pavement increases year by year. However, after the breakage, void removal, staggered platform and other diseases appeared, the rate of rupture and development of the damaged middle road panel in the later stage was much higher than that in the early stage of the disease, the structural integrity of the pavement panel was destroyed, the bearing capacity was reduced, and the accumulative action times of the standard axle load were reduced. Service life is far less than design life. In this paper, the following research is done: 1) the variation of stress and deflection of single cement concrete pavement slab after breaking. According to the characteristics of foundation plate theory and ANSYS finite element analysis, a three-dimensional model is established, and the correctness of the model is verified by the stress Normograph. The relationship between the size of broken plate and bending stress, compressive stress and deflection is obtained. By changing the position of the axial load on the broken plate, the variation of stress and strain is investigated. Finally, the relationship between the size of broken slab and the accumulative action times of standard axial load is deduced, and the influence of broken slab on fracture process is analyzed. (2) the stress, deflection and failure law of multi-block cement concrete pavement slab after void removal are studied. Based on the single block panel, the force transfer bar model is added to establish the three-dimensional solid model of the interaction between the plate and the plate. The relationship diagram of void size, void form, deflection of pavement face plate and bending tension stress is made, and the change law of the action is analyzed. Finally, the relationship between the void shape of multi-block slab and the accumulative action times of standard axle load is deduced, and the influence of void on the fracture is analyzed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.216;U418.6

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