带预埋型钢的装配式混凝土梁受弯性能试验研究  

Experimental study on flexural performance of prefabricated concrete beam with embedded section steel

作　　者：钟瑾 赖晓斌 周琪 胡淑军[3] Zhong Jin;Lai Xiao-bin;Zhou Qi;Hu Shu-jun(Ganzhou Construction Engineering Group Co.Ltd,Ganzhou 341000,China;Zhongmei Engineering Group Ltd,Nanchang 330001,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]赣州建工集团有限公司,江西赣州341000 [2]江西中煤建设集团有限公司,江西南昌330001 [3]南昌大学工程建设学院,江西南昌330031

出　　处：《工程抗震与加固改造》2024年第4期21-28,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51908268);江西中煤建设集团有限公司科研项目(2023JXZMKJ07)。

摘　　要：提出一种带预埋型钢的装配式混凝土梁,可使其与装配式混凝土柱实现干式连接,具有承载力高、连接可靠和施工简单等特点。结合混凝土梁的受力分析,提出预埋型钢的设计方法,分别设计1个带预埋槽钢和1个带预埋角钢的分析模型,并进行受弯性能试验研究,得到相应的破坏模式、荷载-挠度曲线、荷载-钢筋应变曲线和荷载-预埋型钢应变曲线等。结果表明:各试件荷载-挠度曲线均包括弹性阶段、弹塑性阶段和破坏阶段;极限状态下,试件裂缝发展均已充分,底部纵筋已发生严重屈服,但预埋型钢、端部纵筋与端部箍筋均处于弹性,且混凝土梁端与端部钢板未发生分离。另外,带预埋槽钢和带预埋角钢的装配式混凝土梁的荷载-挠度曲线、裂缝发展和破坏模式均基本相同,各阶段荷载和位移误差均小于5%,延性系数均大于3.0,即两种预埋型钢均能满足装配式混凝土梁端连接要求。An innovative prefabricated concrete beam with embedded section steel(PCB-ESS)that has the advantage of high bearing capacity,reliable connection and easy installation is proposed to be used in the column-beam dry connections.Combined with analysis of the concrete beam,the design method of embedded section steel is proposed,so two analysis models based on embedded channel steel and embedded angle steel are designed,and then the flexural performance,and the failure mode,load-displacement curve,load-reinforcement strain curve and load-embedded section steel strain curve can be obtained by test.The results show that the load-displacement curves mainly contain elastic stage,elastic-plastic stage and failure stage.The cracks develop sufficiently and longitudinal reinforcement at the middle bottom of beam are yielded at the ultimate stage,but the embedded section steel and transverse reinforcement are still in elastic,and the separation phenomena between steel plate and end of concrete beam cannot be observed.In addition,the load-displacement curves,crack development and damage modes of the two specimens are basically same,the maximum errors of forces and displacement at each stage are 5%,and the ductility coefficients are more than 3.0,which can achieve the expected mechanical properties.

关 键 词：装配式混凝土梁 预埋型钢 受弯性能 荷载-挠度曲线 破坏模式 

分 类 号：TU392[建筑科学—结构工程]