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为了解决传统桥面铺装设计方法不能准确反映车轮-桥面接触条件下铺装应力响应的问题,提出了一种基于车轮-桥面耦合作用的分析方法。该方法首先建立精细化轮胎及桥面铺装有限元仿真模型,然后将轮胎和桥面铺装的接触耦合转化为时变的边界条件,并形成每一荷载步的整体有限元控制方程,进一步采用Lagrange乘子法和解耦分析技术得到求解接触压应力的迭代方法。以某大跨径长江大桥为例,分析了不同荷位下接触压应力的分布规律,对比了均布荷载和轮胎荷载2种方式对铺装受力状态的影响。结果表明:轮胎荷载作用下铺装的最大纵向、横向拉应力较均布荷载作用更不利,采用轮胎模型可克服现行桥面铺装设计方法中采用均布荷载偏不安全的缺点。
In order to solve the problem that the traditional deck pavement design method can not accurately reflect the pavement stress response under wheel-bridge contact conditions, an analysis method based on the wheel-bridge coupling action is proposed. In this method, the finite element simulation model of tire and deck pavement is firstly established. Then, the contact coupling between the tire and the deck pavement is transformed into the time-varying boundary conditions, and the overall finite element governing equation of each load step is formed. An iterative method to solve contact compressive stress is obtained by using Lagrange multiplier method and decoupling analysis technique. Taking a large span Yangtze River Bridge as an example, the distribution rules of contact compressive stress under different load levels are analyzed. The influences of two kinds of methods, ie uniform load and tire load, on the stress state of pavement are compared. The results show that the maximum longitudinal and transverse tensile stresses of pavement under tire load are more unfavorable than those of uniform load. The tire model can overcome the shortcoming that the uniform load is unsafe in the current bridge deck pavement design method.