反复荷载作用下钢筋混凝土箱涵的数值模拟

发布时间：2018-10-05 17:44

【摘要】：为探讨浅埋式钢筋混凝土箱涵的抗震性能和确保在地震时箱涵侧壁钢筋先于顶板屈服,运用Final-v11有限元软件对承受反复荷载作用的两个箱涵缩尺试验体建立钢筋与混凝土的分离式模型,其中混凝土用三维实体单元模拟,而钢筋用杆单元模拟,考虑其黏结滑移,进行数值模拟分析,通过试验对比结构的滞回曲线、耗能能力、破坏位置、钢筋应变等,结果表明:此种数值模拟方法能够得到合理的结果。为了分析试验体各设计参数对箱涵抗震性能的影响,设计了一变参数模型,对比计算结果可知:增加腋角水平长度和加密顶板配筋均能增强箱涵的耗能能力和抗震性能,并能保证反复荷载作用下侧壁钢筋先于顶板屈服,这对箱涵的抗震设计具有指导意义。
[Abstract]:In order to investigate the seismic behavior of shallow buried reinforced concrete box culvert and ensure that the lateral reinforcement of box culvert will yield before the roof during earthquake, The separated model of steel bar and concrete was established by using Final-v11 finite element software to test two box culverts subjected to repeated load, in which concrete was simulated by three-dimensional solid element, and bar element was used to simulate steel bar, and its bond slip was considered. The results of numerical simulation and comparison of hysteretic curve, energy dissipation capacity, failure position and strain of steel bar show that this numerical simulation method can obtain reasonable results. In order to analyze the influence of the design parameters of the test body on the seismic performance of the box culvert, a variable parameter model is designed. The comparison and calculation results show that increasing the horizontal length of the axillary angle and the reinforcement of the infill roof can enhance the energy dissipation capacity and the seismic performance of the box culvert. It can guarantee the yield of the side wall reinforcement before the roof under the repeated load, which is of guiding significance to the seismic design of the box culvert.
【作者单位】：天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【分类号】：U449.82

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