配置HRB 500E钢筋混凝土梁柱边节点抗震性能研究

发布时间：2018-03-17 01:25

本文选题：HRB　切入点：500E　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,我国钢筋混凝土结构中采用的钢筋强度主要在300~400 MPa范围之间,比欧美发达国家低1~2个强度等级。随着我国经济的迅速发展,大跨度结构和高层建筑的需求量越来越多。在实际工程中采用强度等级较低的钢筋,常常会造成施工困难,尤其是在梁柱节点等钢筋配置较密集的地方。大量的震害表明:梁柱节点发生破坏往往是引发结构发生整体倒塌的重要原因。因此,采用高性能钢筋并且将其应用于实际工程结构中刻不容缓。本文拟对配置高性能钢筋HRB 500E梁柱边节点的抗震性能进行研究。首先对3个配置HRB 500E钢筋梁柱边节点的足尺试件进行了拟静力试验。在试验过程中,通过裂缝观测仪观测裂缝的发展,并进行了详细的描述。通过试验得到试件梁端荷载-位移关系曲线、骨架曲线、延性系数、能量耗散和刚度退化等抗震性能特征值。研究了轴压比和节点配箍率对梁柱边节点抗震性能的影响。通过对试验现象观测表明:所有试件具有相同的破坏方式,即都发生梁端弯曲破坏,并伴随着节点核心区少量的斜裂缝。轴压比和核心区配箍率都对试件的裂缝的发展有一定的影响。三个试件都具有较好的抗震性能。与梁柱边节点试验获得的水平剪力相比,GB 50010提供的计算公式得到抗剪设计值偏于保守,建议适当提高梁柱边节点抗剪设计值。由于所有试件均发生梁弯曲破坏,梁弯曲变形占总变形的比例最高。高轴压比和核心区配箍率降低了试件节点剪切变形所占总变形的比例。采用OpenSees建立了配置HRB 500E钢筋梁柱边节点的有限元模型,模型中BeamColumnJoint单元的剪切块分量采用修正的斜压场理论进行定参。数值分析结果与试验结果吻合较好。在参数分析中,分别研究了梁配筋率、钢筋强度、混凝土强度、节点配箍率和柱轴压比对梁柱边节点抗震性能的影响。结果表明:各个单一变量对梁柱边节点的抗震性能均有一定的影响,主要表现为,可以改变梁柱边节点的破坏模式以及对试件的延性和能量耗散有较大影响。
[Abstract]:At present, the strength of reinforced concrete structures in our country is mainly in the range of 300-400 MPa, which is 1 ~ 2 grades lower than that of developed countries in Europe and America. The demand for large-span structures and high-rise buildings is increasing. The use of low-strength steel bars in practical projects often results in difficulties in construction. Especially in places where the steel bars such as Liang Zhu joints are densely distributed. A large number of earthquake damages show that the destruction of the Liang Zhu joints is often an important reason for the overall collapse of the structure. It is urgent to adopt high performance steel bar and apply it to practical engineering structure. In this paper, the seismic behavior of Liang Zhu side joint with high performance steel bar HRB 500E is studied. First, three side joints with HRB 500E reinforcing bar Liang Zhu are studied. In the course of the test, The development of cracks is observed by fracture observation instrument and described in detail. The load-displacement relation curve, skeleton curve, ductility coefficient of beam end are obtained by test. The effects of axial compression ratio and joint hoop ratio on the seismic behavior of Liang Zhu side joints are studied. The experimental results show that all specimens have the same failure mode. That is, the end of the beam is broken by bending, Along with a small amount of inclined cracks in the core area of the joint, the axial compression ratio and the collocation ratio of the core zone have certain influence on the crack development of the specimen. The three specimens all have better seismic performance. The water obtained from the test with Liang Zhu side joint test has a certain effect on the development of the crack. Compared with the calculation formula provided by GB 50010, the design value of flat shear force is more conservative than that provided by GB 50010. It is suggested that the shear design value of Liang Zhu side joint should be increased appropriately. The ratio of bending deformation to total deformation is the highest. High axial compression ratio and core-zone collocation ratio reduce the ratio of shear deformation to total deformation. The finite element model of Liang Zhu side joint with HRB 500E steel bar is established by OpenSees. The shear block component of BeamColumnJoint element in the model is parameterized by modified baroclinic field theory. The numerical results agree well with the experimental results. In the parameter analysis, the ratio of reinforcement, the strength of reinforcement and the strength of concrete are studied respectively. The effect of joint hoop ratio and column axial compression ratio on seismic performance of Liang Zhu side joint shows that: each single variable has certain influence on the seismic performance of Liang Zhu edge joint, mainly as follows:. The failure mode of Liang Zhu side joint and the ductility and energy dissipation of the specimen can be changed.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375

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