海洋环境下钢筋混凝桥墩冻融循环后性能的研究

发布时间：2019-01-24 20:14

【摘要】：对钢筋混凝土墩柱分别进行20、40、60、100次的冻融循环试验,并且在此基础上对受损的钢筋混凝土构件进行抗压试验;利用ABAQUS有限元分析软件通过建立热力耦合作用下钢筋混凝土墩柱的数值模型来对构件的温度场及受压过程进行模拟,并通过改变冻融循环的次数来分析墩柱温度场的分布、峰值应力、峰值位移等性能的变化。研究结果表明:随着冻融循环次数的增加,构件受压破坏过程加快,构件的峰值应力基本上呈线性下降趋势且下降速度比较均匀;并且当冻融循环次数达到100次时,较循环0次的构件,其峰值应力降低了30.1%,峰值位移增大了2.27倍;说明构件的抗压强度降低,刚度下降,延性增大。同时根据试验与模拟结果的对比,验证了利用ABAQUS有限元软件对冻融循环后钢筋混凝桥墩模拟的可靠性。
[Abstract]:Two hundred freeze-thaw tests were carried out on the reinforced concrete pier columns respectively, and on the basis of these tests, the compressive tests of the damaged reinforced concrete members were carried out. ABAQUS finite element analysis software is used to simulate the temperature field and compression process of the reinforced concrete pier column by establishing the numerical model of the reinforced concrete pier column under thermal coupling, and the distribution of the temperature field of the pier column is analyzed by changing the number of freeze-thaw cycles. Peak stress, peak displacement and other performance changes. The results show that with the increase of freeze-thaw cycles, the compressive failure process of the components is accelerated, and the peak stress of the components decreases linearly and the decreasing speed is uniform. When the number of freeze-thaw cycles reaches 100 times, the peak stress is reduced by 30.1kW and the peak displacement is increased 2.27 times than that of the members with 0 cycles, which indicates that the compressive strength, stiffness and ductility of the members are decreased, and the ductility is increased. At the same time, according to the comparison of test and simulation results, the reliability of the simulation of reinforced concrete pier after freeze-thaw cycle is verified by using ABAQUS finite element software.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;上海市城市建设工程学校(上海市园林学校);
【基金】：国家自然科学基金项目(51178264) 铁道部科技研究开发计划项目(J2011G003)
【分类号】：U443.22

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