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Ultimate Strength of R/C Wall Girder-Column Joint with Eccentricity

偏心钢筋混凝土墙梁柱节点极限强度

基本信息

批准号：
12650585
负责人：
KAMIMURA Tomohiko
金额：
$ 1.86万
依托单位：
Shibaura Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650585/
关键词：
Reinforced Concrete Structures Wall Girder Joint Eccentricity Torsional Force Ultimate Strength Finite Element Method

项目摘要

The mechanical behavior of wall girder-column subassemblages and beam-column subassemblages with one-sided eccentricity is discussed from the experimental results and the results of three-dimensional nonlinear analysis based on Finite Element Method. The following conclusions are obtained from the test results and the results of analysis : 1 The failure mode of girder-column subassemblages with eccentricity, which are designed so that joint should failed in shear in no consideration of eccentricity, was torsional failure is column subjected to torsion and shear. The amount of joint reinforcement and that of column longitudinal reinforcement did not have an influence on ultimate strength of a column in combined torsion and shear. The equation for predicting the ultimate strength of columns in combined torsion and shear approximately gives an agreement with the test data, but a failure criteria equation for the joint used in the same way as for the column does not give a prediction of-the ultimate strength of joints with eccentricity, because pure torsional strength of joints can not be calculated. 2 The proposed equation for the shear strength of column gives a prediction of the shear strength of wall girder-column joint without eccentricity. 3 In the case of beam-column joints with a small eccentricity, the equation for predicting the ultimate strength of joints under combined torsion and shear gives an agreement with the test data, And also the ultimate strength of joints can be estimated by considering the assumption of effective section' 4 In the case of wall girder-column joint with eccentricity, the results of three-dimensional nonlinear analysis indicate that torsional angle in joint is larger than that in column, The maximum compressive stress in joint is generated in side near the wall girder, and most of the joint shear stress is carried, in joint area near the wall girder.

结合试验结果和三维非线性有限元分析结果，讨论了墙体梁柱组合体和单侧偏心梁柱组合体的受力性能。通过试验和分析，得出以下结论：1对于不考虑节点偏心的梁柱组合节点，其破坏形式为剪切破坏，即柱在扭转和剪切共同作用下的扭转破坏。节点配筋量和柱纵筋配筋量对柱的抗扭抗剪极限承载力没有影响。预测柱在扭转和剪切联合作用下的极限强度的公式近似地给出了与试验数据相一致的结果，但是以同样的方式用于柱的节点的破坏准则公式不能给出偏心节点的极限强度的预测，因为节点的纯扭转强度不能被计算。2.提出的柱抗剪强度计算公式可用于无偏心的墙梁柱节点的抗剪强度计算。3在小偏心率情况下，梁柱节点在扭剪共同作用下的极限承载力计算公式与试验结果吻合较好，并可考虑有效截面假定来估算节点的极限承载力。4在偏心率情况下，三维非线性分析结果表明，节点扭转角大于柱扭转角，节点最大压应力产生在靠近墙梁一侧，并承担了大部分节点剪应力，在靠近墙梁的接缝区域。