圓形鋼管混凝土Y型節(jié)點軸壓及抗震性能試驗研究
發(fā)布時間：2019-01-21 13:56
【摘要】：本文以成都云端塔工程為背景，該工程主體結構高度185.1米，上部結構采用鋼管混凝土柱、鋼梁、組合樓板的混合框架—鋼筋混凝土核心筒的結構體系，結構形式和受力都十分復雜，特別是混合框架中的大尺寸鋼管混凝土Y型節(jié)點，難以用軟件模擬其受力性能、破壞形式和構造措施，因而設計方西南設計院委托我們課題組對該Y型節(jié)點進行試驗研究。 為研究該Y型節(jié)點（本文研究節(jié)點二）分別在靜力荷載和地震荷載作用下的承載能力、破壞形式、柱身及節(jié)點焊縫區(qū)應力應變分布，以及驗證節(jié)點構造措施的有效性，本文對節(jié)點二的4個構件共進行了6次試驗，并在試驗完成后進行有限元分析，與試驗結果對比，驗證試驗結果的合理性和可靠性。主要的試驗工作如下： ①第一組試驗包括2個構件的3次試驗，分別為空心節(jié)點、斜柱填充混凝土節(jié)點以及全填充混凝土節(jié)點的單調(diào)靜力加載試驗（其中斜柱填充混凝土節(jié)點的試驗是對加載過的空心節(jié)點的斜柱進行加固處理后的補充試驗）。主要研究填充混凝土前后節(jié)點的極限抗壓承載力、破壞形式以及驗證構造措施的有效性。 ②第二組試驗試件同第一組，該組3次試驗均為重復加載試驗。主要研究填充混凝土前后節(jié)點的抗震性能、破壞形式以及驗證構造措施的有效性。 通過試驗研究和分析，得到的主要研究結論如下： ①節(jié)點二空心節(jié)點，在單調(diào)靜力加載試驗和重復加載試驗中，其極限承載力分別達到軸力設計值的1.02倍和0.76倍；填充混凝土后，其極限承載力分別達到軸力設計值的1.7倍和1.6倍，遠超軸力設計值且節(jié)點依然能夠保持其軸向承載能力，當加載至軸力設計值時，，柱身和節(jié)點焊縫區(qū)幾乎都未達到屈服，由此可證明原設計的安全性和可靠性。 ②空心節(jié)點在兩種荷載分別作用中，最后出現(xiàn)破壞的地方都出現(xiàn)在斜柱柱身，節(jié)點焊縫區(qū)域未出現(xiàn)破壞；填充混凝土后，節(jié)點焊縫區(qū)域的應變也要小于柱身應變且未發(fā)生破壞，表明節(jié)點焊縫區(qū)域不會在梁柱等其他構件破壞之前發(fā)生破壞，確保結構在地震荷載作用下有良好的變形能力和耗能性能，實現(xiàn)了抗震設計中“強節(jié)點弱構件”的設計理念。 ③在比較試驗結果和有限元分析結果后可知，在空心鋼管節(jié)點和鋼管混凝土節(jié)點的單調(diào)靜力加載中，兩種結果的力與位移曲線都擬合的比較好，由此也可以驗證試驗結果的可靠性。
[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.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU352.11;TU398.9
本文編號：2412722
[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.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU352.11;TU398.9
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