(1 筑友智造建设科技集团有限公司， 长沙 410000；2 湘潭大学土木工程与力学学院， 湘潭 411105)

［摘要］为解决装配式预制沉箱构件出筋、定位、找平复杂等问题，提出了一种可调竖向受力连接件和永久拉剪连接件，将其试用在全预制沉箱侧壁与边梁的连接上。通过对该全预制沉箱进行四点加载试验，探究该沉箱侧壁与边梁的连接性能及楼板的力学性能与破坏模式。完整记录了全预制沉箱试件的现场装配、连接件安装、叠合梁二次浇筑、试验加载直至破坏的全过程。试验结束后，获得该全预制沉箱与叠合梁的荷载-跨中位移曲线、连接件附近钢筋的应变数据、试件裂缝发展规律等，并通过规范对比探讨试件的力学性能。试验结果表明：试件从屈服到破坏发生了较大变形，延性良好；试件的最大极限承载力远大于卫生间的设计荷载水准，具有足够的安全储备。试验结束以楼板的破坏为标志，最终沉箱底板破坏为典型的双向板破坏，此时，叠合梁与连接件完好，证明该连接件安全、可靠。 

［关键词］装配式建筑；预制后浇；全预制沉箱；连接件；叠合梁；四点加载；力学性能 

中图分类号：TU375-2 文献标识码：A文章编号：1002-848X(2021)16-0021-08

Experimental study on mechanical properties of assembly prefabricated caissons and connectors 

SHI  Mingzhe1,  LI Jie2,  LIAO  Zhenying1,  YU  Dayou1,  CHEN  Jun2,  CHEN  Fuliang1 

(1 DIT Group Limited, Changsha 410000， China；2 College of Civil Engineering and Mechanics, Xiangtan University,  Xiangtan 411105， China) 

Abstract: In order to solve the problems of rebar sticks out of the specimen, positioning and leveling of prefabricated caisson components, an adjustable vertical force connection and permanent tension-shear connection was proposed to apply in the connections of side walls and side beams of the prefabricated caissons. Through the four-point loading test of the prefabricated caisson, the connection performance of the side wall and the side beam of the caissons and the mechanical properties and failure mode of the floor slab were explored. The entire process of on-site assembly of prefabricated caisson specimens, installation of connectors, secondary pouring of composite beams, test loading and failure was fully recorded. After the test, the load and mid-span displacement curve of the prefabricated caisson and the composite beam, the strain data of the reinforcing steel near the connection piece, the crack development law of the specimen were obtained. And the mechanical properties of the specimen were discussed through the comparison of specifications. The test results show that the specimen undergoes large deformation from yielding to failure, and has good ductility; its maximum ultimate bearing capacity is much greater than the design load level of the bathroom, and it has sufficient safety reserves. The end of the test is marked by the failure of the floor slab, and the final failure of the caisson bottom plate is a typical two-way slab failure. At this time, the laminated beam and the connector are intact, which proves that the connector is safe and reliable. 

Keywords:assembly building； prefabricated post-pouring； fully prefabricated caisson； connector； composite beam； four-point loading； mechanical property

*“科技助力经济2020”重点专项（SQ2020YFF0426587），湖南省创新型省份建设专项（2019RS1059），湖南省自然科学基金(2019JJ60047)。

 作者简介：施明哲，博士，工程师，Email:shi.mingzhe@outlook.com； 通信作者：俞大有，学士，高级工程师，Email:1119252971@qq.com。