绿色高性能纤维增强水泥基复合材料梁柱节点抗震性能研究  

Study on seismic behavior of green high-performance fiber-reinforced cementitious composites beam-column joint

作　　者：李言 李秀领[1,2] LI Yan;LI Xiuling(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering,Ministry of Education,Jinan 250101,China)

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]建筑结构加固改造与地下空间工程教育部重点实验室,济南250101

出　　处：《建筑结构》2021年第15期88-93,37,共7页Building Structure

基　　金：国家自然科学基金项目(51108253,51278290);中国地震局工程力学研究所实验室开放课题(2019D10);山东省高校土木结构防灾减灾协同创新中心开放课题(XTM201901)。

摘　　要：绿色高性能纤维增强水泥基复合材料(green high-performance fiber-reinforced cementitious composites,GHPFRCC)是具有高韧性、卓越的裂缝控制能力、高耗能特点的新型绿色建筑材料,具有较好的抗震应用前景。首先进行了混凝土梁柱节点和GHPFRCC梁柱节点的低周往复荷载试验,在验证模型有效性的基础上,利用OpenSees对GHPFRCC梁柱节点的抗震性能进行轴压比、GHPFRCC浇筑范围的参数化分析。结果表明:OpenSees数值模拟的混凝土梁柱节点和GHPFRCC梁柱节点滞回曲线与试验值吻合较好;提高轴压比可以增强节点的抗剪承载力,但会降低节点延性,建议轴压比取值0.3~0.5;GHPFRCC可以增强梁柱节点的抗震性能,节点核心区及600~900mm梁端范围浇筑GHPFRCC可以有效改善节点的抗震性能。Green high-performance fiber-reinforced cementitious composites(GHPFRCC)is a new type of green building material with high toughness,excellent crack-control capacity and energy consumption,which has a good prospect in seismic application.Low-cycle reciprocating load tests of a concrete beam-column joint and a GHPFRCC beam-column joint was carried out firstly.Based on the validity of the model,the seismic performance of GHPFRCC beam-column joint was analyzed by OpenSees for parametric analysis of axial compression ratio and GHPFRCC pouring range.The results show that the hysteresis curves of concrete beam-column joint and GHPFRCC beam-column joint simulated by OpenSees are in good agreement with the experimental values.Increasing the axial compression ratio can enhance shear bearing capacitie of joint,however,the ductility of the joint will decrease,and the axial compression ratio is recommended to be 0.3~0.5.GHPFRCC can enhance seismic performances of beam-column joint when it is used in the joint pouring,and pouring GHPFRCC in core area and 600~900mm beam length can effectively improve seismic performances of joint.

关 键 词：高性能纤维增强水泥基复合材料 梁柱节点 抗震性能 抗剪承载力 

分 类 号：TU375.[建筑科学—结构工程]