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刘家峡大桥首次在国内采用大规模钢管混凝土构件作为悬索桥桥塔。为保证该桥桥塔在施工各阶段的安全性,模拟刘家峡悬索桥桥塔实际受力制作1/10缩尺比例模型进行加载试验,并采用ANSYS软件建立有限元模型对试验结果进行验证与对比,研究钢管混凝土结构钢管与混凝土的黏结滑移力学性能。研究结果表明:当试验荷载超过钢管与混凝土黏结力后,钢管和混凝土的相对位移与试验荷载呈线形变化关系;钢管应变从受力端向构件中部逐渐减小,受混凝土材料的不均匀性、钢管壁的粗糙程度不同等因素的影响,钢管应变与距加力端距离呈非线性变化关系,但总体呈逐渐增加趋势;通过试验结果得到的黏结强度及滑移位移均大于有限元软件计算结果,但两者相差不大,说明有限元结果可用于实际工程,并偏于安全。
For the first time, Liujiaxia Bridge adopts large-scale concrete-filled steel tubular members as suspension bridge towers in China. In order to ensure the safety of the bridge tower in various stages of construction, the 1/10 scale scale model was simulated to simulate the actual force of suspension bridge tower of Liujiaxia, and the finite element model was established by ANSYS software to verify and compare the test results. Study on the Bond-slip Mechanical Properties of Concrete Filled Steel Tubes and Concrete. The results show that the relative displacement between steel pipe and concrete changes linearly with the test load when the test load exceeds the cohesion between steel pipe and concrete. The strain of steel pipe decreases gradually from the stress end to the middle part of the pipe and is affected by the nonuniformity of concrete material, Steel pipe wall roughness and other factors, the strain of steel pipe and the force from the end of a non-linear relationship between the change, but the overall trend was gradually increased; the bond strength and slip displacement obtained by the test results are greater than the results of finite element software , But the difference between them is insignificant, which shows that the finite element result can be used in practical engineering and is biased towards safety.