海洋环境下钢筋混凝桥墩冻融循环后性能的研究  

Properties cycling in marine environment reinforced concrete piers thaw

作　　者：孙红运 方从启[1] 段桂珍[1,2] 胡冉[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海市城市建设工程学校(上海市园林学校),上海200232

出　　处：《混凝土》2017年第4期78-82,共5页Concrete

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)

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。Reinforced concrete piers were 20 times, freeze-thaw cycle test 40 times, 60 times, 100 times, and on this basis, damaged reinforced concrete members compressive test.Using ABAQUS finite element analysis software to establish by heat numerical model coupling reinforced concrete piers to simulate the temperature field and pressure process member,and by changing the number of freeze-thaw cycles to analyze the changes in the distribution of temperature field pier, peak stress, peak displacement properties.The results show that with the increase of freeze-thaw cycles, accelerate the process of destruction of compression member, member of peak stress decreased substantially linear and uniform rate of decline.And when the freeze-thaw cycles up to 100 times over the cycle 0 the second component,the peak stress decreased 30.1% peak displacement increased 2.27 times.Legend compressive strength member is lowered, stiffness degradation,ductility increases.At the same time according to comparative test and simulation results validate the use of ABAQUS finite element software after freezing reinforced concrete piers simulation reliability.

关 键 词：钢筋混凝土 桥墩 冻融循环 抗压 

分 类 号：TU528.01[建筑科学—建筑技术科学]