钢筋混凝土框架梁柱边节点抗震性能研究

发布时间：2018-03-08 04:27

本文选题：钢筋混凝土　切入点：框架节点　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：节点区作为钢筋混凝土框架结构的重要受力部位，是结构抗震的薄弱环节所在。对框架节点的研究通常从以下两方面开展：一类局限于节点，重点研究节点核心区的破坏机理和受剪性能；另一类是从整体结构出发研究节点，为确保核心区的安全可靠，提出合理的设计方法。现行抗震设计规范要求实现“强柱弱梁、强节点弱构件”。因此，通常要求梁端塑性铰先于柱端出现，柱端先于节点出现，故在此情况下主要研究梁端屈服后的节点区性能。本文从第二个方面对平面框架节点进行研究。通过两个平面钢筋混凝土框架梁柱边节点的水平低周反复荷载试验，从承载力、节点受剪及变形能力、耗能能力等方面对边节点进行抗震性能研究。进而应用ABAQUS有限元软件对钢筋混凝土框架梁柱边节点进行有限元参数分析，研究不同轴压比和纵向钢筋配筋率对构件抗震性能的影响。最后结合试验研究和有限元分析，对现行设计方法进行验证。得出如下结论：（1）对于钢筋混凝土框架梁柱边节点，按照现行规范设计的节点试件，在反复荷载作用下，未发生节点核心区破坏，，按现行规范设计安全可靠。（2）随着柱端弯矩增大系数的提高，对于平面梁柱节点试件，破坏模式从柱端混凝土压溃破坏转变成梁端塑性铰破坏，现行规范规定柱端弯矩增大系数有效地实现了“强柱弱梁”。（3）若边节点试件发生梁端屈服破坏，混凝土柱轴压比变化对钢筋混凝土节点承载能力和抗震性能影响甚微。（4）随着柱子纵向钢筋配筋率的逐步提高（但应满足最大配筋率要求），“强柱弱梁”开始体现出来，梁端出现了塑性铰，显著提高了节点的极限承载能力和抗震性能，在保证“强柱弱梁”的前提下，柱子纵向钢筋配筋率的增加，节点的极限承载能力和抗震性能有所提高。（5）对于钢筋混凝土平面梁柱边节点，在不考虑板和墙对梁承载力的提高的条件下，现行规范相关条文保证可以确保实现预期的“强柱弱梁”破坏模式，现行设计规范相关要求是合理的。
[Abstract]:As an important force position of reinforced concrete frame structure, the joint area is the weak link of seismic resistance. The research of frame joint is usually carried out from the following two aspects: one is limited to the joint, the other is limited to the joint. The failure mechanism and shear behavior of the core zone of the joints are mainly studied. The other is to study the joints from the whole structure. In order to ensure the safety and reliability of the core region, a reasonable design method is put forward. The current seismic design code requires the realization of "strong column and weak beam," Therefore, the plastic hinge at the end of the beam is usually required to appear before the end of the column and the end of the column before the joint, so in this case, the performance of the joint after yielding at the end of the beam is mainly studied. In this paper, the joint of the plane frame is studied from the second aspect. Through horizontal low cycle cyclic loading tests of Liang Zhu side joints of two plane reinforced concrete frames, the capacity of bearing capacity, shear and deformation of joints are studied. The seismic behavior of side joints is studied in terms of energy dissipation capacity, and the finite element parameters of Liang Zhu edge joints of reinforced concrete frame are analyzed by using ABAQUS finite element software. The effects of axial compression ratio and longitudinal reinforcement ratio on the seismic behavior of members are studied. Finally, the current design method is verified by combining experimental research and finite element analysis. The conclusions are as follows:. 1) for the side joints of reinforced concrete frame Liang Zhu, the joint specimens designed according to the current code have no damage to the core zone of the joints under the action of repeated load, and the design is safe and reliable according to the current code. 2) with the increasing of column end moment increasing coefficient, the failure mode of plane Liang Zhu joint specimen is changed from column end concrete crushing failure to beam end plastic hinge failure. The "strong column weak beam" is effectively realized by the increasing coefficient of column end moment in current code. 3) if the beam end yield failure occurs, the axial compression ratio of concrete column has little effect on the bearing capacity and seismic performance of reinforced concrete joint. (4) with the gradual increase of longitudinal reinforcement ratio (but should meet the requirement of maximum reinforcement ratio), the "strong column and weak beam" began to manifest, and the plastic hinge appeared at the end of the beam, which significantly improved the ultimate bearing capacity and seismic performance of the joints. On the premise of "strong column and weak beam", the longitudinal reinforcement ratio of the column is increased, and the ultimate bearing capacity and seismic performance of the joint are improved. (5) for reinforced concrete plane Liang Zhu side joints, without considering the improvement of the bearing capacity of slab and wall to beam, the relevant provisions of the current code guarantee that the expected failure mode of "strong column and weak beam" can be achieved. The relevant requirements of the current design code are reasonable.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375;TU352.11

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