论文部分内容阅读
为了充分研究双层板组合桁架桥组合节点的性能,对3个有着不同栓钉、混凝土销栓力和穿孔板的连接件的组合节点进行循环荷载下的疲劳性能试验,在不同循环荷载下,钢板和混凝土之间发现了位移反应、应变分布、裂缝扩展以及相对滑移的现象。试验结果显示,随着荷载增加甚至进行特定的循环荷载时,挠度呈几乎直线上升趋势。在进行2×106次的循环荷载后,除了一些滑移产生的微裂纹外,在钢-混凝土的结合面上并没有发生严重损坏,说明3个组合节点的疲劳性能良好。根据试验结果建立组合节点的三维有限元模型,分析发现,强度和刚度的有限元分析结果与试验结果相吻合。最后,根据相关技术参数从钢筋、焊缝和抗剪连接件方面评估疲劳性能。此研究对组合桁架桥的设计和施工有参考意义。
In order to fully study the performance of the composite joints of the double-deck slab truss bridge, the fatigue behavior of three composite joints with different studs, concrete pinning forces and perforated plates were tested under cyclic loading. Under different cyclic loads, Displacement reaction, strain distribution, crack propagation and relative slippage were found between steel plate and concrete. The experimental results show that the deflection increases almost linearly with the increase of load and even under certain cyclic loads. After 2 × 106 cyclic loadings, no serious damage was found on the steel-concrete interface except for some slip-induced micro-cracks, indicating that the fatigue behavior of the three combined joints is good. According to the experimental results, the three-dimensional finite element model of composite joints was established. The results of finite element analysis of strength and stiffness were in good agreement with the experimental results. Finally, the fatigue properties are evaluated in terms of rebars, welds and shear connectors according to the relevant technical parameters. This research has reference significance for the design and construction of the truss bridge.