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为采用Overlay Tester对钢桥面铺装材料性能进行评价,介绍了其试验方法和理论,利用Abaqus有限元程序建立了局部钢桥面铺装、复合梁和Overlay Tester的三维有限元模型。研究结果表明,3个实体模型具有相似由反弯作用或拉伸作用造成的拉伸效应应力分布特征。同时,复合梁的钢板部件的应力远大于复合梁的铺装层应力,复合梁的钢板承担了主要试验外力荷载,降低了对铺装层材料评价的针对性。为此,分别对0.63、0.063 mm和0.01 mm 3种不同位移加载模式的Overlay Tester进行数值分析。结果表明,传统的0.63 mm位移拉应力过大,超过铺装材料固有强度,采用0.01 mm的最大拉应力基本与钢桥面铺装的最大拉应力值在一个数量级,考虑到试验周期等因素,最终选定0.063 mm的位移模式作为今后评价钢桥面铺装材料裂缝扩展特性的加载条件。
In order to evaluate the performance of the steel deck pavement by using Overlay Tester, the test method and theory were introduced. The three-dimensional finite element model of local steel deck pavement, composite beam and Overlay Tester was established by Abaqus finite element program. The results show that the three solid models have similar tensile stress distribution characteristics caused by the anti-bending or stretching. At the same time, the stress of the steel plate of the composite beam is far greater than the stress of the pavement of the composite beam, and the steel plate of the composite beam takes the main experimental external load and reduces the pertinence of the pavement layer material evaluation. For this reason, numerical analysis was conducted on Overlay Tester with three different displacement loading modes of 0.63, 0.063 mm and 0.01 mm respectively. The results show that the tensile stress of the traditional 0.63 mm displacement is too large and exceeds the inherent strength of the paving materials. The maximum tensile stress of 0.01 mm is basically an order of magnitude greater than the maximum tensile stress of steel deck pavement. Considering the test period and other factors, Finally, a displacement of 0.063 mm was selected as the loading condition for the future evaluation of crack propagation characteristics of steel bridge deck paving materials.