装配整体式框架U形钢筋连接节点试验研究

发布时间：2019-05-27 19:29

【摘要】：1999年,我国从法国引进了一种预制预应力混凝土装配整体式框架结构体系(世构体系)。它不仅具有施工速度快、施工质量好、节能环保等优点,而且采用先张法预应力技术,减少用钢量,降低工程造价,目前已经在许多实际工程中应用推广。根据现有规范,并基于之前所做的研究结果,本文设计了三个世构体系框架梁柱中节点试件并进行低周反复试验,使用有限元软件进行模拟分析,通过试验与数值模拟更深入地了解世构体系框架节点的受力性能。主要内容如下：(1)完成了三个世构体系中节点的低周反复试验,对不同配筋率、有无键槽条件下节点的抗震性能进行研究,根据试验现象和试验数据绘出结构的滞回曲线,对节点的延性、耗能能力和刚度强度退化等情况得出定量的评价。(2)采用OpenSees对世构体系的梁柱节点进行模拟分析,并与试验结果相比较。模拟结果较准确地预测了试件在各周循环的加卸载刚度以及强度退化,反映了实际试验中试件的滞回曲线的形态和捏拢效应。模拟采用不同非线性粱柱单元和不同的节点核心区受剪模型理论,并讨论模型建立的合理性。(3)采用OpenSees进行节点的参数分析,探究各参数对节点抗震性能的影响。(4)根据本次的试验结果,指出了论文的不足,对世构体系的进一步研究和推广给出了建议。研究表明：按规范设计的世构体系节点的延性满足要求：试件的设计应保证节点核心区的受剪承载力,避免出现弱节点强构件的情况；非线性有限元软件OpenSees能够较好地模拟梁柱节点在低周反复荷载作用下的反应。
[Abstract]:In 1999, China introduced a precast prestressed concrete assembly integral frame structure system (world structure system) from France. It not only has the advantages of fast construction speed, good construction quality, energy saving and environmental protection, but also adopts pretensioned prestress technology to reduce the amount of steel used and the cost of the project, which has been applied and popularized in many practical projects. According to the existing specifications and based on the previous research results, this paper designs three time frame Liang Zhu node specimens and carries on the low cycle repeated test, and uses the finite element software to carry on the simulation analysis. Through experiments and numerical simulation, the mechanical properties of frame joints of the world structure system are deeply understood. The main contents are as follows: (1) the low cycle repeated tests of the nodes in the three systems are completed, and the seismic performance of the joints with different reinforcement ratios and with or without keyways is studied, and the hysteretic curves of the structures are drawn according to the test phenomena and test data. The toughness, energy dissipation capacity and stiffness strength degradation of the joints are quantitatively evaluated. (2) OpenSees is used to simulate and analyze the Liang Zhu joints of the structural system, and the results are compared with the experimental results. The simulation results accurately predict the loading and unloading stiffness and strength degradation of the specimen in each cycle, which reflects the shape and kneading effect of the hysteretic curve of the specimen in the actual test. Different nonlinear beam column elements and different node core area shear models are used in the simulation, and the rationality of the model is discussed. (3) OpenSees is used to analyze the parameters of the nodes. The influence of each parameter on the seismic performance of the joint is explored. (4) according to the test results, the shortcomings of the paper are pointed out, and some suggestions for further research and popularization of the structure system are given. The results show that the toughness of the structural system joints designed according to the code meets the requirements: the design of the specimens should ensure the shear capacity of the core area of the joints and avoid the occurrence of strong members of weak joints. The nonlinear finite element software OpenSees can simulate the response of Liang Zhu joints under low cyclic loading.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU378

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