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Study on Modeling for Damage Evaluation of Reinforced Concrete Beam-Column Joints Subjected to Multi-axial Combined Loading

多轴联合荷载下钢筋混凝土梁柱节点损伤评估模型研究

基本信息

批准号：
15360291
负责人：
SHIOHARA Hitoshi
金额：
$ 6.98万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The objective of this project is to establish on unified mechanical model and damage evaluation method for reinforced concrete beam-column joints including interior, exterior and knee joints under seismic loading and verification of the model with test specimens. The results of this project is briefly described as follows,1.Results of analytical study on ultimate strength and failure mode of interior beam-column joint with proposed model called quadruple flexural resistance shows good correlation with previous test results and the effects of many parameters were declared.2.Third scale three reinforced concrete interior beam-column subassembladges with or without eccentricity were tested. The test results indicated that the eccentricity in the joints led to lower capacity in story shear and severe damage of concrete on the side to which the center line of beams shifted. In the case of eccentric joint, large deflection to out-of-plane direction occurred and it seemed to have accelerated the concrete damage on the side of the joint to which the beams shifted.3.Six specimens of one third scale reinforced concrete beam-column subassembladges with identical section and bar arrangement were loaded. In order to simulate the conditions of interior, exterior and knee joint, three types of boundary conditions and loading setup were provided. The test results indicated that the rotation of four parts of the joint divided with diagonal cracks was dominative in story drift deformation in case of joint failure after yielding of beams as the proposed model assumes. On the contrary, deflection of beams and rotation at beam ends were dominative in case of flexural failure of beam.4.A macro element of beam-column joint for non-linear frame analysis was proposed. The model is constructed with non-linear uni-axial springs that are modeling concrete, bars and bond actions.

本课题旨在建立钢筋混凝土梁柱节点（包括内节点、外节点和膝节点）在地震荷载作用下的统一力学模型和损伤评估方法，并通过试验对模型进行验证。主要研究成果如下：1.采用四重抗弯承载力模型对梁柱内节点的极限承载力和破坏模式进行了分析，分析结果与试验结果吻合较好，并考虑了多种参数的影响。2.对三个钢筋混凝土梁柱内节点进行了三缩尺偏心和无偏心试验。试验结果表明，节点偏心会导致节点层间受剪承载力降低，梁中心线偏移一侧混凝土破坏严重。在偏心节点的情况下，节点的大挠度可能会加速节点一侧的混凝土破坏。3.对6个1/3缩尺、相同截面和配筋方式的钢筋混凝土梁柱组合件进行了试验研究。为了模拟内部、外部和膝关节的情况，提供了三种类型的边界条件和载荷设置。试验结果表明，在梁屈服后节点破坏的情况下，层间位移变形主要是由节点四个部分的转动引起的，且节点的转动与节点的斜裂缝有关。反之，在梁的弯曲破坏时，梁的挠度和梁端的转动起主导作用。4.提出了一种用于非线性框架分析的梁柱节点宏单元。该模型是由非线性单轴弹簧，是模拟混凝土，酒吧和债券的行动。