摘要
为研究采用钢企口连接的预制叠合主次梁节点受力性能,设计了一个钢企口连接的预制叠合主次梁节点试件和一个整浇主次梁节点试件,进行静力加载试验,考察两试件的破坏模式、承载力、变形能力、荷载-悬臂端挠度关系、钢筋应变和钢企口栓钉应变等。研究结果表明:钢企口连接的预制叠合次梁的裂缝主要集中在主次梁交界面、次梁固端至钢企口范围内和次梁底部,表现为次梁固端弯曲破坏;钢企口连接的预制叠合次梁的开裂荷载和屈服荷载可基本等同整浇次梁,正截面受弯承载力比整浇次梁提高约100%;梁端荷载小于80kN时,钢企口近端栓钉受压、远端栓钉受拉,梁端荷载大于80kN时,钢企口各栓钉应力突增;钢企口连接的预制叠合次梁的正截面受弯承载力实测值与《混凝土结构设计规范》(GB 50010—2010)(2015年版)计算值的比值为109,可按规范计算值预测其正截面受弯承载力;拉-压杆模型计算得出钢企口连接的预制叠合次梁的破坏模式为拉杆破坏(受弯破坏)。
In order to study mechanical performance of precast composite primary and secondary beam joints connected by steel groove,a precast composite primary and secondary beam joint specimen connected by steel groove and a cast-in-place primary and secondary beam joint specimen were designed.Static loading tests were conducted to investigate the failure mode,bearing capacity,deformation capacity,load-cantilever end deflection relationship,steel bar strain and steel groove stud strain,etc.The research results indicate that the cracks of precast composite secondary beam connected by steel groove are mainly concentrated in the interface between the primary and secondary beam,within the range from the fixed end of secondary beam to the steel groove,and the bottom of the secondary beam,which is manifested as the bending failure of the fixed end of secondary beam.The cracking load and yield load of precast composite secondary beam connected by steel groove can be basically equivalent to the cast-in-place beam,and the flexural bearing capacity of normal section is about 100%higher than that of cast-in-place beam.When the load at beam end is less than 80kN,the proximal studs of the steel groove are compressed,while the distal studs are pulled.When the load at beam end is greater than 80kN,the stress of each studs of the steel groove increases sharply.The ratio of the measured value of the flexural capacity of the normal section of the precast composite secondary beam connected by the steel groove to the calculated value of the Code for design of concrete structures(GB 50010—2010)(2015 Edition)is 109.The flexural bearing capacity of the normal section can be predicted according to the calculated value of the specification.The strut-and-tie model calculates that the failure mode of prefabricated composite secondary beam connected by steel groove is failure of the tension bar(flexural failure).
作者
黄泽
黄奕斌
王黎
韦宏
程从密
李家豪
HUANG Ze;HUANG Yibin;WANG Li;WEI Hong;CHENG Congmi;LI Jiahao(Architectural Design&Research Institute of SCUT Co.,Ltd.,Guangzhou 510641,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)
出处
《建筑结构》
北大核心
2024年第15期45-51,共7页
Building Structure
基金
广东省住房和城乡建设厅科技计划项目(2022-K9-473255)。
关键词
钢企口
预制叠合主次梁
受力性能
静力加载试验
拉-压杆模型
steel groove
precast composite primary and secondary beam
mechanical performance
static loading test
strut-and-tie model
