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Capacities of Reinforced Concrete Beam-Column Joints and the Deformation Characteristics of Frames

钢筋混凝土梁柱节点承载力及框架变形特性

基本信息

批准号：
08455256
负责人：
FUJII Shigeru
金额：
$ 5.44万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455256/
关键词：
reinforced concrete beam-column joint shear strength seismic response knee joints bi-directional loading database ductility factor 履歴特性高強度鉄筋プレート定着 U字型定着付着せん断抜けだし

项目摘要

The following findings were obtained through the ersearch :(1)Shear strength of various types of jointsShear strengths of interior column-, exterior column-beam joints, T-shaped joints and knee joints were investigated experimenbtally. The strength ratio for these joints with appropriate anchorage details are 1 : 0.7 : 0.7 : 0.4 respectively. Especially for knee joints, the joint capacity is strongly dependent on the bar anchorage details and loading directions.(2)Joint shear capacity under two directional loadingsFailure interaction curve of corner column-beam joints under bi-directional loadings can be modeled as a circle. Bi-directional loading history degrades the flexural capacity of the column due to the bond deterioration in corner longitudinal column bars.(3)Statistical analysis of shear strength and ductility in interior column-beam sub-assemblageCollecting a total of 332 data of previous joint shear experiments, the effects of several parameters on joint shear strength were a … More nalyzed. joint shear strength increases proportionally to sigma_B (sigma_B : concrete compressive strength). Ductillity factor is governed by the ratio of joint shear strength to the joint shear input corresponding to the beam flexural strength. The empirical equation was derived considering the effect of joint shear reinforcement and material strength.(4)Seismic response of frame structures with various hysterisis characteristics.Conducting the dynamic analysis for a identified single-mass model with various dumping characteristics, the effect of loss of energy dissipating capacity due to the bond-slip behavior and the degradation of joint shear resistance on the whole frame deformation characteristics was discussed. The future research needs on the hysterisis model and on the interaction between seismic power and allowable joint degradation were pointed out.(5)Experimental study on the improvement of the joint capacity in high strength RC frames by hinge-relocation methodArranging the additional beam longitudinal bars, which are passing through the joint, made the critical sections apart from column faces and kept joint elastic. Hinge relocation method is effective way to improve the joint capacities and to control the bond deterioration. Less

通过研究得到以下结论： (1)各类节点的抗剪强度对内柱节点、外柱梁节点、T型节点和膝节点的抗剪强度进行了试验研究。这些具有适当锚固细节的接头的强度比分别为 1 : 0.7 : 0.7 : 0.4 。特别是对于膝关节，其关节承载力很大程度上取决于钢筋锚固细节和加载方向。(2)两个方向加载下的节点抗剪承载力角柱梁节点在双向加载下的失效相互作用曲线可以建模为一个圆。由于角部纵向柱筋的粘结恶化，双向加载历史降低了柱的抗弯承载力。(3)内部柱梁组合体抗剪强度和延性统计分析收集了以往节点剪切试验的332个数据，分析了多个参数对节点抗剪强度的影响。接缝剪切强度与 sigma_B 成比例增加（sigma_B：混凝土抗压强度）。延性系数由接头剪切强度与对应于梁弯曲强度的接头剪切输入之比控制。 (4)不同滞后特性的框架结构的地震响应。对已确定的具有不同倾倒特性的单质量模型进行动力分析，讨论了粘结滑移行为导致的耗能能力损失和节点抗剪性能下降对整个框架变形特性的影响。指出了未来对迟滞模型以及地震功率与接头许用退化相互作用关系的研究需要。(5)铰移法提高高强RC框架接头承载力的试验研究通过设置穿过接头的附加梁纵筋，使关键截面远离柱面，保持接头弹性。铰链重新定位方法是提高接头性能、控制粘结劣化的有效方法。较少的