切缝法测定水泥混凝土路面残余应力数值模拟分析

发布时间：2018-03-31 00:13

本文选题：水泥混凝土路面　切入点：残余应力　出处：《土木工程学报》2014年06期

【摘要】：残余应力和固化翘曲的存在使得水泥混凝土路面(机场道面)的开裂模式向多样化发展,对路面长期服役行为产生深远影响。利用切缝过程中板表面应变释放历史确定板内初始应力和残余应力的方法尚处于初步阶段。通过建立三维有限元模型,对切缝过程中板的响应进行数值模拟,系统分析不同测点位置、边界约束方式、地基刚度、板厚、切缝间距、切缝深度、温度场构成方式等工况组合下的混凝土板上表面的应力、应变释放规律。在此基础上提出基于干切缝法的水泥混凝土板全深度绝对应力和残余应力分布预估方法,以深距比综合考虑切缝间距、切缝深度对应力、应变释放规律的影响,以应变释放极限值考虑板的大小、厚度、温度场构成方式、下卧层刚度等因素对应变释放过程的影响,给出表征混凝土板表面应变释放规律的基函数及其参数取值。最后,通过足尺大板数值算例验证该方法的可靠性,建议试验过程中将切缝深距比终值定在1.0~1.5范围内,同时尽量不要选择切缝厚距比小于1.25的切缝方案。
[Abstract]:The existence of residual stress and curable warpage makes the cracking mode of cement concrete pavement (airport pavement) diversified and has a profound influence on the long-term service behavior of pavement.The method of determining the initial stress and residual stress in the plate by using the surface strain release history in the process of cutting is still in its initial stage.Through the establishment of three-dimensional finite element model, the response of the plate in the process of cutting joint is numerically simulated, and the different measuring point position, the boundary constraint mode, the foundation stiffness, the thickness of the plate, the spacing of the cutting joint, the depth of the cut joint are systematically analyzed.The stress and strain release law of the upper surface of concrete slabs under the combination of temperature field and other working conditions.On this basis, a method for predicting the distribution of total depth absolute stress and residual stress of cement concrete slab based on dry joint method is proposed. The effect of depth ratio on stress and strain release is considered comprehensively.Based on the limit value of strain release, the effects of plate size, thickness, temperature field composition and horizontal stiffness on the strain release process are considered. The basic function and parameter values of the strain release law on the surface of concrete slabs are given.Finally, the reliability of the method is verified by a numerical example of full-scale large plate. It is suggested that the final value of slit depth ratio should be set in the range of 1.0 ~ 1.5 in the course of test, and that the slit scheme with slit thickness ratio less than 1.25 should not be chosen at the same time.
【作者单位】：交通运输部公路科学研究院;哈尔滨工业大学;
【基金】：国家自然科学基金青年基金(51108140) 交通运输部西部交通建设科技项目(2007318223 01)
【分类号】：U416.216

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