圆形钢管混凝土Y型节点轴压及抗震性能试验研究

发布时间：2019-01-21 13:56

【摘要】：本文以成都云端塔工程为背景，该工程主体结构高度185.1米，上部结构采用钢管混凝土柱、钢梁、组合楼板的混合框架—钢筋混凝土核心筒的结构体系，结构形式和受力都十分复杂，特别是混合框架中的大尺寸钢管混凝土Y型节点，难以用软件模拟其受力性能、破坏形式和构造措施，因而设计方西南设计院委托我们课题组对该Y型节点进行试验研究。为研究该Y型节点（本文研究节点二）分别在静力荷载和地震荷载作用下的承载能力、破坏形式、柱身及节点焊缝区应力应变分布，以及验证节点构造措施的有效性，本文对节点二的4个构件共进行了6次试验，并在试验完成后进行有限元分析，与试验结果对比，验证试验结果的合理性和可靠性。主要的试验工作如下： ①第一组试验包括2个构件的3次试验，分别为空心节点、斜柱填充混凝土节点以及全填充混凝土节点的单调静力加载试验（其中斜柱填充混凝土节点的试验是对加载过的空心节点的斜柱进行加固处理后的补充试验）。主要研究填充混凝土前后节点的极限抗压承载力、破坏形式以及验证构造措施的有效性。 ②第二组试验试件同第一组，该组3次试验均为重复加载试验。主要研究填充混凝土前后节点的抗震性能、破坏形式以及验证构造措施的有效性。通过试验研究和分析，得到的主要研究结论如下： ①节点二空心节点，在单调静力加载试验和重复加载试验中，其极限承载力分别达到轴力设计值的1.02倍和0.76倍；填充混凝土后，其极限承载力分别达到轴力设计值的1.7倍和1.6倍，远超轴力设计值且节点依然能够保持其轴向承载能力，当加载至轴力设计值时，，柱身和节点焊缝区几乎都未达到屈服，由此可证明原设计的安全性和可靠性。 ②空心节点在两种荷载分别作用中，最后出现破坏的地方都出现在斜柱柱身，节点焊缝区域未出现破坏；填充混凝土后，节点焊缝区域的应变也要小于柱身应变且未发生破坏，表明节点焊缝区域不会在梁柱等其他构件破坏之前发生破坏，确保结构在地震荷载作用下有良好的变形能力和耗能性能，实现了抗震设计中“强节点弱构件”的设计理念。 ③在比较试验结果和有限元分析结果后可知，在空心钢管节点和钢管混凝土节点的单调静力加载中，两种结果的力与位移曲线都拟合的比较好，由此也可以验证试验结果的可靠性。
[Abstract]:This paper takes Chengdu Yunduan Tower Project as the background. The main structure of the project is 185.1 meters high, and the superstructure adopts the structure system of concrete filled steel tube column, steel beam and composite floor, which is a hybrid frame-reinforced concrete core tube. The structure form and force are very complex, especially the large size steel tube concrete filled steel tube Y-shaped joints in the mixed frame, it is difficult to use software to simulate its mechanical performance, failure form and construction measures. So the southwest design institute commissioned our research group to test and study the Y-joint. In order to study the bearing capacity, failure form, stress and strain distribution of column body and joint weld zone under static load and seismic load respectively, and to verify the effectiveness of the joint construction measures, the Y-type joint (this paper studies the second node). In this paper, six tests were carried out on the four components of node two, and the finite element analysis was carried out after the completion of the test. The results were compared with the test results to verify the reasonableness and reliability of the test results. The main experimental work is as follows: (1) the first group of tests consists of three tests of two components, one of which is hollow joints. The monotone static loading test of inclined column filled concrete joints and fully filled concrete joints (where the test of inclined column filled concrete joints is a supplementary test after reinforcement of the loaded hollow joints). The ultimate compressive bearing capacity, failure form and validity of structural measures of the joints before and after filling concrete are studied. 2 the second group of specimens was the same as the first group, and the three tests in this group were repeated loading tests. The aseismic behavior, failure form and validity of structural measures of the joints before and after filling concrete are studied. Through experimental research and analysis, the main conclusions are as follows: 1 in monotone static loading test and repeated loading test, The ultimate bearing capacity is 1.02 times and 0.76 times of the design value of axial force, respectively. The ultimate bearing capacity of concrete filled with concrete is 1.7 times and 1.6 times of the axial force design value respectively, which far exceeds the axial force design value and the joint can still maintain its axial bearing capacity, when loading to the axial force design value, The safety and reliability of the original design can be proved by almost no yield in the weld zone of the column and the joint. (2) in the action of the two kinds of loads, the final failure of hollow joints occurs in the oblique column body, and there is no damage in the weld zone of the joint; After filling the concrete, the strain in the weld zone of the joint is also smaller than the strain of the column body and no damage has taken place, indicating that the weld zone of the joint will not be destroyed before the damage of Liang Zhu and other members. The design concept of "strong joints and weak members" in seismic design is realized by ensuring that the structure has good deformation capacity and energy dissipation performance under the action of earthquake load. 3After comparing the test results with the results of finite element analysis, it can be seen that in the monotone static loading of hollow steel tubular joints and concrete-filled steel tubular joints, the force and displacement curves of the two results are fitted well. The reliability of the test results can also be verified.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.11;TU398.9

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