交错桁架体系RC柱与桁架连接节点受力性能分析  

Analysis on the Mechanical Behavior of RC Column to Truss Joint in Staggered Truss System

作　　者：周祥 许天祥[1,2] 王宣鼎 刘界鹏 Xiang Zhou;Tianxiang Xu;Xuanding Wang;Jiepeng Liu(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University),Ministry of Education,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]山地城镇建设与新技术教育部重点实验室(重庆大学),重庆400045

出　　处：《钢结构（中英文）》2020年第11期40-54,共15页Steel Construction（Chinese & English）

基　　金：国家自然科学基金项目(51890902)。

摘　　要：交错桁架结构体系最早于20世纪60年代出现于美国,并得到了广泛应用,典型的交错桁架结构体系主要由柱、楼板及平面桁架等构件组成,柱可采用H型钢柱、钢管柱、钢管混凝土柱等,楼板可以采用空心楼板、叠合楼板、现浇钢筋混凝土楼板等,桁架可以采用空腹式桁架、帕式桁架或混合式桁架。该结构体系具有开间大、施工便捷、经济、高效、环保等优势,同时其结构质量轻、整体受力性能好,柱内力一般较小,导致采用钢柱时设计控制指标通常为长细比,造成了材料的浪费。预制钢筋混凝土(reinforced concrete,RC)柱具有实心截面且施工便捷的优势,运用在交错桁架结构体系中,可以更充分地利用柱的力学性能,进而提高交错桁架结构体系的经济效益。然而,要实现RC柱的应用必须先实现柱-桁架节点的可靠连接。中建科技有限公司设计开发了采用预制RC柱、钢桁架和预应力混凝土楼板的装配式交错桁架结构,重庆大学对该结构体系进行了静力弹塑性分析,以评估其抗震性能。国内外学者对交错桁架结构体系中的桁架及结构体系抗震性能进行了大量的试验研究与理论分析,但对于交错桁架结构体系节点仅少量学者进行了一些较为初步的研究,且主要针对钢或钢管混凝土柱-桁架节点。为研究交错桁架体系中RC柱与桁架连接节点的受力性能,基于ABSQUS有限元软件,针对该工程中采用的典型RC柱-桁架节点,即RC柱与上弦杆和斜腹杆连接处的牛腿加预埋板式节点,建立了有限元模型,对其在结构设计分析中出现的5种最不利工况下的应力分布、斜腹杆荷载-位移曲线以及弦杆截面内力进行了分析,主要研究参数包括RC柱轴压比、是否限制弦杆水平位移及斜腹杆的受力情况。研究结果表明:1)杆件内力可通过节点板传至牛腿或预埋钢板,再通过锚杆传至柱内,传力路径明确,节点设计�The staggered truss structural system originated from America in the 1960s,which has been widely used.Typical staggered truss structural system consists of columns,floors,plane trusses,etc.The H-shaped steel,steel pipe,and concrete-filled steel tube(CFT)can be used as structural columns.The slabs can be designed to be hollow slab,composite slab,cast-in-place reinforced concrete slab,etc.In addition,there are three typical types of trusses,i.e.open-web truss,parker truss,and hybrid truss.This structural system has advantages of large space,light structural weight,convenient construction process,economic benefits,high efficiency,and environmentally friendly.In addition,the structure has light weight and good integrity,resulting in a small internal force of the column.When steel columns are used,the slenderness ratio is usually considered as the design control condition,resulting in a waste of materials.The precast reinforced concrete(RC)column is characterized by solid section and convenient construction process.Application of precast RC column into the staggered truss structural system can make better use of the mechanical properties of the column and improve economic benefits of this type of structural system.However,a robust column to truss joint is necessary for the application of RC columns.China Construction Science&Technology Co.,Ltd.,designed and developed a prefabricated staggered truss structural system consisting of RC columns,steel trusses and pre-stressed concrete floor.The inelastic static analysis of this structural system was conducted by Chongqing University to evaluate its seismic performance.A host of experimental and theoretical studies have been conducted to investigate the seismic performance of the truss and staggered truss structural system.For the column to truss joint of staggered truss structural system,preliminary investigations are still limited,and previous studies mainly focused on the mechanical performance of steel or CFT column to truss joint.In this study,a finite element model(FE

关 键 词：钢筋混凝土柱-交错桁架结构 节点 应力 内力 荷载-位移曲线 

分 类 号：TU375[建筑科学—结构工程]