| CFRP板条嵌入式加固RC框架节点的抗震性能试验研究及有限元分析 |
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| 引用本文： | 王国林,杨冀锟,祁尚远,陈明珠,张普.CFRP板条嵌入式加固RC框架节点的抗震性能试验研究及有限元分析[J].西北地震学报,2022,44(6):1260-1267. |
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| 作者姓名： | 王国林 杨冀锟 祁尚远 陈明珠 张普 |
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| 作者单位： | 上海应用技术大学 城市建设与安全工程学院,上海 201418;上海应用技术大学 城市建设与安全工程学院,上海 201418 ；上海奉贤城乡建设投资开发有限公司,上海 201499;上海应用技术大学 城市建设与安全工程学院,上海 201418 ；湖北中医药大学 采购与招投标办,湖北 武汉 430065;郑州大学 土木工程学院,河南 郑州 450001 |
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| 基金项目： | 国家自然科学基金项目(51308339)；上海应用技术大学中青年教师科技人才发展基金项目(KJFZG11) |
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| 摘 要： | 为验证 CFRP板条嵌入式加固方法对提升十字形 RC框架节点抗震性能的有效性,开展了1 个 CFRP板条嵌入式加固节点和1个对比节点的拟静力试验研究.试验结果表明:在核心区及相邻梁端嵌入 CFRP板条可起到类似箍筋的抗剪作用,使得节点由核心区剪切破坏转变为梁端受弯破坏,且梁铰得到转移;构件抗震性能明显提升,承载力和延性分别提高了16．3%和13．7%.同时, 利用 ABAQUS建立试验数据验证的有限元模型,并对节点主要加固设计参数进行影响分析.结果表明,节点承载力随着 CFRP板条面积的增大、板条间距的减小和基体混凝土强度的提高而提高.所提节点加固方法体现出塑性铰转移的抗震设计理念,同时提高核心区抗剪强度和梁端的抗弯强度,可用于 RC节点的抗震加固.
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| 关 键 词： | 梁柱节点 碳纤维板条 嵌入法加固 抗震性能 塑性铰转移 |
Experimental study and finite element analysis on the seismic performance of RC beam-column joints strengthened with embedded CFRP laminates |
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| WANG Guolin,YANG Jikun,QI Shangyuan,CHEN Mingzhu CH.,ZHANG Pu.Experimental study and finite element analysis on the seismic performance of RC beam-column joints strengthened with embedded CFRP laminates[J].Northwestern Seismological Journal,2022,44(6):1260-1267. |
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| Authors: | WANG Guolin YANG Jikun QI Shangyuan CHEN Mingzhu CH ZHANG Pu |
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| Abstract: | A quasi-static test study of one near-surface mounted (NSM) strengthening joint with carbon fiber-reinforced polymer (CFRP) laminate, and one comparative joint was conducted in this study to evaluate the seismic performance of cruciform RC beam-column joints strengthened with NSM CFRP laminates. Test results show that the use of NSM CFRP laminates in joints and adjacent beam ends could change the failure mode from the joint shear to the beam flexural failure and further relocate away the plastic hinge from the column face. Moreover, the capacity and ductility of joints were increased by 16.3 %and 13.7 %, respectively. Finite element models were also established using ABAQUS and then used to perform parametric studies to understand the effects of several critical design factors on the seismic behavior of joints. Results show that the bearing capacity of joints increases with the laminate area and concrete strength and decreases with the increase in the laminate spacing. The proposed strengthening method, which reflects the seismic design concept of plastic hinge transfer, improves the shear strength of the joint core area and the bending strength of beam ends. Thus, this method is available for the seismic strengthening of RC joints. |
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