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.

该项目的目的是建立在统一的机械模型和损伤评估方法上，用于在地震载荷下进行内部，外部和膝关节，包括内部，外部和膝关节，并用测试样品对模型进行验证。该项目的结果简要描述如下，1。对最终的强度和内部束点关节的分析研究的结果，该模型称为四倍抗弯曲抗性，表明与先前的测试结果良好相关，许多参数的效果被声明了。2.ThixdThack scale conforce concrete Cycrete Cycrete Cycrete Cycrete Cycrete Cycrete Interior Beam-col cole contior beam-coles colesembbladence conterion contrictions conterion beam-beam-classembbladges ancectircents conterction contrictities。测试结果表明，关节的偏心率导致故事剪切的能力较低，而混凝土的严重损坏则在横梁的中心线移动的侧面。在偏心的关节的情况下，发生了大偏转到平面外向，并且似乎加速了梁移动的关节侧的混凝土损坏。3.3.3.3.SIX的第三刻度钢筋混凝土横梁 - 柱柱子隔板带有相同的截面和条形布置。为了模拟内部，外部和膝关节的条件，提供了三种类型的边界条件和装载设置。测试结果表明，与对角线裂纹分开的关节四个部分的旋转在故事漂移变形的情况下是主导地位的，如果束在束屈服后，如拟议的模型所假定的那样。相反，在梁弯曲的情况下，梁的挠度和梁端处的旋转是主导的。4。提出了用于非线性框架分析的梁柱接头的宏元素。该模型是由非线性单轴弹簧构建的，这些弹簧正在建模具体，棒和键作用。