纤维增强复合材料筋混凝土梁柱外节点受剪性能研究  

Shear behavior study on FRP⁃reinforced concrete exterior beam⁃column joints

作　　者：王步[1,2,3] 孟林杰 卫冲 徐林峰 黄飞 Wang Bu;Meng Linjie;Wei Chong;Xu Linfeng;Huang Fei(School of Civil Engineering,Chang′an University,Xi′an 710061,China;International Joint Research Center for Disaster Prevention of Civil Infrastructures,Xi′an 710061,China;Research Institute of Testing and Retrofitting Engineering Structures,Chang’an University,Xi′an 710061,China;Chengdu JZFZ Architecture Design Co.Ltd,Zhengzhou 450000,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]土木工程基础设施防灾国际联合研究中心,陕西西安710061 [3]长安大学工程结构诊断与改造研究所,陕西西安710061 [4]成都基准方中建筑设计有限公司郑州分公司,河南郑州450000

出　　处：《建筑科学》2023年第5期168-179,共12页Building Science

基　　金：中央高校基本科研业务费专项经费资助项目(300102282501)。

摘　　要：推广高耐久性的纤维增强复合材料(FRP)筋混凝土框架结构无法回避的一个技术难题是梁柱节点的受剪设计。采用能考虑FRP筋横观各向同性弹性材性和复杂应力状态的三维实体精细化有限元仿真分析方法,在试验校核的基础上,对FRP筋混凝土梁柱外节点的受剪性能进行了系统性研究。获得了包括FRP筋种类、核芯区配箍率、核芯区箍筋间距、梁纵筋配筋率、梁端配箍率以及梁端剪跨比在内的不同因素的影响规律。进而通过对不同工况节点受剪极限状态下FRP筋应力状态的分析,揭示了FRP筋的线弹性材性对节点受剪机制的有利作用,并明确了节点域FRP筋构造应考虑拉-剪复合作用的设计特点。To solve the unavoidable problem of designing beam⁃column joints when promoting the high⁃durable FRP⁃reinforced concrete frames,the refined three⁃dimensional finite element method is used to systematically investigate the shear behavior of FRP⁃reinforced concrete exterior beam⁃column joints.The method can simulate the transversely isotropic elastic property and complex stress states of FRP reinforcements,and is calibrated against experimental observations.The roles of the parameters involving type of FRP reinforcements,joint stirrup ratio,joint stirrup pitch,percentage of beam bars and beam⁃end shear span⁃to⁃depth ratio are clarified.By analyzing the stress states of the different FRP reinforcements in beam⁃column joints under the ultimate limit states,the beneficial effect from the linear elastic behavior of FRP reinforcements on the shear mechanism of beam⁃column joints is revealed,and the design of FRP reinforcement under combined tensile and shear stresses is proposed.

关 键 词：纤维增强复合材料筋 混凝土结构 梁柱节点 受剪性能 有限元分析 

分 类 号：TU528.58[建筑科学—建筑技术科学]