【作者】 陈磊；

【导师】 戎贤；

【作者基本信息】 河北工业大学 ， 建筑与土木工程， 2020， 硕士

【摘要】 近年来,随着住宅不断产业化,钢管混凝土结构得到了广泛的应用。作为关键部位的梁柱节点连接形式较为复杂、施工容错性小,在一定程度上限制了该结构形式的发展。为推广钢管混凝土结构的应用,有必要研究一种装配方便、施工容错性大的节点形式。为此本文拟通过上焊下栓的方式进行钢管混凝土柱与工字型钢梁的连接,并进行上焊下栓节点的抗震试验和有限元分析,为该类型节点的结构设计提供充分的参考依据。本文提出一种带外肋环板的隔板贯通式方钢管混凝土柱-钢梁上焊下栓节点,节点核心区只在下翼缘连接处设置了一道贯通隔板,更有利于混凝土的浇筑和振捣,柱侧的外肋环板能增加节点的刚度。为研究其抗震性能,设计并进行了三个上焊下栓节点和一个全螺栓对照节点的拟静力试验。分析贴板厚度、梁截面尺寸的改变对节点破坏特征、滞回曲线、骨架曲线、耗能、刚度退化以及承载力退化的影响,以评估上焊下栓节点的抗震性能。结果表明:三个上焊下栓节点破坏形态基本一致,主要由于梁端屈曲及延性断裂导致构件破坏,节点的荷载-位移滞回曲线饱满,耗能能力、刚度退化能力、承载力退化能力良好,表现出接近全螺栓节点的抗震性能。梁截面尺寸增大后,节点极限抗弯承载力、刚度及耗能能力等得到显著提高,贴板厚度增加后节点的抗震性能并无明显提高。通过观察分析应变片及非接触应变测试仪(DSCM)的测量结果,发现主应变及剪应变主要呈45°斜向发展,在连接板下侧、内隔板靠近柱侧以及横排中部、钢梁下翼缘靠近梁中处三个位置的应变较大,上焊下栓节点核心区应变值要小于全螺栓节点。本文使用有限元分析软件ABAQUS对四个节点进行了有限元模拟,分析了隔板贯通式方钢管混凝土柱-钢梁上焊下栓节点在低周往复荷载作用下的变形情况和抗震性能,并与试验结果进行了比较,发现试验结果与模拟结果吻合度较好。在此基础上对节点进行了参数化分析,分析了轴压比、钢管厚度、钢梁上翼缘强度以及外环板厚度对上焊下栓节点抗震性能的影响,结果表明轴压比和钢管厚度的变化对节点抗震性能有显著影响,而钢梁上翼缘强度和外环板厚度对节点抗震性能影响较小。更多还原

【Abstract】 In recent years,with the continuous industrialization of housing,concrete-filled steel tubular structure has been widely used.As a key part of the beam column joint,the connection form is more complex and the construction fault tolerance is small,which limits the development of the structure form to a certain extent.In order to popularize the application of concrete-filled steel tubular structure,it is necessary to study a joint form with convenient assembly and large construction fault tolerance.In this paper,the connection between concrete-filled steel tubular column and H-shaped steel beam is carried out by means of the bottom flange bolted and top flange welded,and the seismic test and finite element analysis of the bottom flange bolted and top flange welded joint are carried out to provide sufficient reference for the structural design of this type of joint.In this paper,a new type of the bottom flange bolted and top flange welded joint between concrete-filled steel tubular columns and steel beam with the through diaphragm and the outer rib ring plate is proposed.The core area of the joint only sets a through diaphragm at the joint of the lower flange,which is more conducive to the pouring and vibration of concrete,and the outer rib ring plate on the column side can increase the stiffness of the joint.In order to study its seismic performance,three bottom flange bolted and top flange joints and a full-bolted joint were design for test under low-frequency cyclic loading.In order to evaluate the seismic performance of the bottom-bolted and top-welded joint,the influences of the thickness of the plate and the size of the beam section on the failure characteristics,hysteretic curve,skeleton curve,energy consumption,stiffness degradation and bearing capacity degradation of the joint are analyzed.The results show that the failure mode of three bottom flange bolted and top flange joints is basically the same,mainly due to the beam end buckling and ductile fracture,the load displacement hysteretic curve of the joint is full,the energy dissipation capacity,stiffness degradation capacity and bearing capacity degradation capacity are good,showing the seismic performance close to the full bolt joint.With the increase of beam section size,the ultimate flexural capacity,stiffness and energy dissipation capacity of the joint are significantly improved,while the seismic performance of the joint is not significantly improved with the increase of the thickness of the plate.Through the observation and analysis of the results of strain gauge and non-contact strain tester(DSCM),it is found that the main strain and shear strain mainly develop in a 45 ° oblique direction,the strain of the lower side of the connecting plate,the inner diaphragm near the column side,the middle of the horizontal row and the bottom flange near the beam are larger,and the strain value of the core area of bottom flange bolted and top flange welded joint is smaller than that of the full-bolt joint.In this paper,the finite element analysis software ABAQUS is used to simulate the four nodes,and compared with the test results,it is found that the test results are in good agreement with the simulation results.On this basis,the parametric analysis of the joint is carried out,and the influence of the axial compression ratio,the thickness of the steel pipe,the strength of the upper flange of the steel beam and the thickness of the outer ring plate on the seismic performance of the joint is analyzed,the results show that the change of axial compression ratio and thickness of the steel pipe has a significant impact on the seismic performance of the joint,while the strength of the upper flange of the steel beam and the thickness of the outer ring plate have little impact on the seismic performance of the joint.更多还原