| 钢管柱-钢筋混凝土框架转换节点设计研究 |
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| 引用本文： | 范重, 柴会娟, 陈巍, 聂鑫, 高劲洋, 樊健生, 葛红斌, 黄进芳. 钢管柱-钢筋混凝土框架转换节点设计研究[J]. 工程力学, 2020, 37(6): 65-78. DOI: 10.6052/j.issn.1000-4750.2019.05.0282 |
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| 作者姓名： | 范重 柴会娟 陈巍 聂鑫 高劲洋 樊健生 葛红斌 黄进芳 |
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| 作者单位： | 1.1. 中国建筑设计研究院, 北京 100044 |
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| 基金项目： | 中国建设科技集团股份有限公司科技创新基金项目（W2016043） |
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| 摘 要： | 在传统钢管柱与钢筋混凝土框架转换方式的基础上，提出了一种适用性较强的新型转换节点。框架柱纵向受力钢筋与节点域钢管侧壁焊接，框架梁纵向受力钢筋与节点钢牛腿翼缘焊接。该转换节点钢管下插长度小，节约钢材效果明显。通过钢牛腿翼缘的叠层式连接构造，既能解决框架梁钢筋焊接的问题，又可减小牛腿翼缘偏心受力的影响，焊接施工方便。在清华大学教育部重点实验室进行了4个转换节点的缩尺模型试验，并采用非线性有限元软件Marc对转换节点的受力机理进行深入分析。结果表明：在水平往复荷载作用下，试件加载至最大位移时，牛腿端部混凝土压溃、剥落，纵向受力钢筋弯折变形显著，形成塑性铰。框架柱顶部混凝土裂缝数量较少，试验结束时框架柱基本完好。钢管柱底部管壁可能进入屈服，钢管柱及节点域均未出现面外变形。试件的荷载-位移滞回曲线饱满，具有良好的耗能能力。钢管柱的最大应力均出现在框架的顶部附近，过渡段钢管的应力低于钢管柱。在达到极限变形状态时，钢牛腿、内环板及竖向加劲肋应力较低，均处于弹性状态。该钢管柱-钢筋混凝土框架转换节点具有良好的技术经济性能，能够达到“强节点、弱构件”的抗震性能目标。
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| 关 键 词： | 钢管柱 混凝土框架 转换节点 试验 有限元分析 |
| 收稿时间： | 2019-05-28 |
| 修稿时间： | 2019-09-29 |
DESIGN AND RESEARCH ON STEEL TUBE COLUMN-RC FRAME TRANSFER JOINTS |
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| FAN Zhong, CHAI Hui-juan, CHEN Wei, NIE Xin, GAO Jin-yang, FAN Jian-sheng, GE Hong-bin, HUANG Jin-fang. DESIGN AND RESEARCH ON STEEL TUBE COLUMN-RC FRAME TRANSFER JOINTS[J]. Engineering Mechanics, 2020, 37(6): 65-78. DOI: 10.6052/j.issn.1000-4750.2019.05.0282 |
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| Authors: | FAN Zhong CHAI Hui-juan CHEN Wei NIE Xin GAO Jin-yang FAN Jian-sheng GE Hong-bin HUANG Jin-fang |
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| Affiliation: | 1.1. China Architecture Design & Research Institute, Beijing 100044, China |
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| Abstract: | Based on the traditional transfer form of steel tube columns and reinforced concrete (RC) frames, a new type of the transfer joint with good applicability was proposed. The longitudinal reinforcing bars of the RC column were welded to the steel pipe walls in the connecting region and the longitudinal reinforcing bars of the RC beams were welded to the flanges of the steel brackets. The downward insert length of the steel tubes was small within the transfer joint. Therefore, the effect of saving steel material was obvious. By using the laminated connecting detail at the flange of the H-section steel, the welding problem for the reinforcing bars of RC beams could be solved, and the influence of the eccentric force on the flanges could be simultaneously reduced. In the Key Laboratory of the Ministry of Education of Tsinghua University, four scaled models were tested for the transfer joints. The nonlinear finite element software Marc was used to analyze the mechanism of the transfer joints. The results show that under horizontal cyclic loading, when the specimens were loaded to the maximum displacement, the concrete at the end of the H-section steel was crushed and peeled off, and the longitudinal reinforcing bars were bent significantly to form a plastic hinge. The number of concrete cracks at the top of the frame column was small, and the frame column was basically intact at the end of the test. The pipe wall at the bottom of the steel tube column may have yielded, but the out-of-plane deformation on the steel tube column and joint region did not occur. The load-displacement hysteresis curves of the test specimens were full and had good deformability. The maximum stress of the steel tube column appeared near the top of the frame, and the stress of the transition section was lower than that of the steel tube column. When the ultimate deformation was reached, the H-section steel, inner ring plate and vertical stiffeners had lower stress and were in the elastic state. The steel tube column-RC frame transfer joint has good technical and economic performance, and can achieve the seismic performance target of “strong joint and weak component”. |
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| Keywords: | steel tube column RC frame transfer joint test finite element analysis |
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