新型纤维改性混凝土装配式框架节点抗震性能分析  

Seismic Performance Analysis of Beam-Column Connections of Prefabricated Fiber Modified Concrete Frames

作　　者：杨晓华 张骞[2] 吴森坤 冯健[2] 蔡建国[2] YANG Xiaohua;ZHANG Qian;WU Senkun;FENG Jian;CAI Jianguo(China Railway Construction Investment Group Corporation Limited,Zhuhai 519000,China;National Prestress Engineering Research Center,Southeast University,Nanjing 210096,China)

机构地区：[1]中国铁建投资集团有限公司,广东珠海519000 [2]东南大学国家预应力工程技术研究中心,南京210096

出　　处：《工业建筑》2023年第4期102-107,147,共7页Industrial Construction

基　　金：省政策引导类计划-重点国别产业技术研发合作项目(BZ2021036)。

摘　　要：为研究在节点核心区及键槽区等后浇区部分采用纤维改性混凝土对梁柱节点抗震性能的影响,基于此概念设计了改进的预制预应力装配式梁柱节点。以试件SJ1和SJ4为研究对象,系统分析梁柱节点设计参数对节点性能的影响,包括后浇区混凝土强度及延性、梁纵筋强度和后浇区箍筋间距。结果表明:后浇区混凝土受压延性的降低会加剧高配筋率节点试件强度退化及位移延性降低;提高梁纵筋强度等级可以显著提高装配式框架梁柱节点的承载能力,同时会降低其位移延性;增大后浇区的箍筋间距会降低节点试件的位移延性,并且高配筋率梁柱节点的抗震性能对后浇区箍筋间距的调整更敏感。The influence of concrete reinforced with fibers in the post-cast region,including the connection region and beam service holes,was studied.An improved precast prestressed beam-column connection was designed by using fiber modified concrete in the connection area.For specimen SJ1 and SJ4,the influence of design parameters on the mechanical properties of connections was investigated systematically,which including the ductility and strength of concrete in the post-cast region,beam longitudinal rebar strength,and stirrup spacing in the post-cast region.The results showed that the reduction of compressive ductility of post-cast concrete had a more obvious promoting effect on the accelerated degradation of the connection strength and the reduction of displacement ductility of connections with a high reinforcement ratio.By increasing the strength grade of beam longitudinal rebars,the bearing capacity of connections would be improved significantly,while there was a drop in the displacement ductility.The displacement ductility of connections decreased with enlarging the stirrup spacing in the post-cast region.Moreover,the seismic performance of the connections with a high reinforcement ratio were more sensitive to the increase of the stirrup spacing of post-cast region.

关 键 词：预制预应力梁柱节点 纤维改性混凝土 抗震性能 参数分析 非线性有限元 

分 类 号：TU352.11[建筑科学—结构工程] TU37