匝道钢桥面沥青铺装简化设计方法

选用叠层连续梁作为计算基本模型,将沥青铺装表面的最大弯拉应变以及钢面板与沥青铺装界面最不利剪应力作为设计控制指标,以实体工程的结构参数作为计算模型参数,采用有限元计算方法,分别计算分析了大纵坡、超高横坡条件造成铺装表面产生的水平力及其对铺装结构内部应力应变的影响.根据计算结果提出修正基本模型计算结果的方法与具体修正系数的计算.在此基础上提出匝道钢桥面沥青铺装简化设计方法.最后,以实体工程为例,将该设计方法用于工程实践.实践证明,以叠层连续粱为基本模型,考虑纵、横坡度修正后进行匝道钢桥面沥青铺装设计是可行的.

Simplified Design Method of Asphalt Pavement for Ramp Steel Bridge

Based on the model of continuous laminated beam, the max flexure tensile strain in the top of pavement and the max imum shear stress on the interface between steel deck and asphalt pavement was determined as the design controlling indexes. Taken the structure parameters of a real ramp steel bridge as the calculation parameters, the horizontal force in pavement surfacing caused by steep longitudinal gradient and super elevation transverse gradient and its effect on stress and strain in interior structure were computed by FEM. Based on the results of computation, the method to modify computation result of basic model and the computation of corrective coefficient were presented. As a result, the simplified design method of asphalt pavement for ramp steel bridges was presented. At last, the computation method was used in practical engineering. The practice shows that the method based on model of continuous laminated beam and corrective coefficient for longitudinal and transverse gradients is practicable.