大跨度预应力叠合楼盖新型拼缝构造研究  

STUDY OF A NEW MONOLITHIC STRUCTURE JOINT OF LONG-SPAN COMPOSITE PRESTRESSED CONCRETE FLOOR SLABS

作　　者：廖智强 陈甫亮 廖桢颖 俞大有 李俊杰 LIAO Zhiqiang;CHEN Fuliang;LIAO Zhenying;YU Dayou;LI Junjie(CMIG Drawin,Changsha 410000,China)

机构地区：[1]中民筑友建设科技集团有限公司,长沙410000

出　　处：《工业建筑》2020年第10期63-68,共6页Industrial Construction

基　　金：“科技助力经济2020”重点专项(SQ2020YFF0426587);湖南省创新创业投资项目(2018GK5003)共同资助。

摘　　要：预应力密拼叠合楼盖的拼缝连接性能是当前研究的热点。通过斜交叉伸出预制底板的钢筋,并在预制板的拼缝位置紧贴预制板顶配置附加钢筋,构造了一种新型拼缝形式。通过试验研究表明:采用斜交叉预制底板钢筋能较好地将两侧的预应力板结合在一起受力,拼缝连接处强于现浇板,试件在拼缝两侧破坏;采用箍筋代替桁架钢筋,试件破坏时拼缝处叠合板的预制层与叠合层混凝土均未脱开,表明箍筋能有效地限制预制层与叠合层混凝土裂缝发展。通过不同厚度的叠合板试验进一步表明采用该新型拼缝构造的板承载力和变形能力可满足设计要求,为大跨度预应力双向叠合楼盖设计提供新思路。There is a current research hotspot on performances of monolithic structure joints composite prestressed concrete slabs.A new monolithic structure joint of composite prestressed concrete slab was proposed,in which the rebars of the prefabricated panel were outstretched with oblique crossing,and several additional rebars were placed close to the top of the prefabricated panel.The experimental results showed that the rebars oblique-cross details of steel bars in the prefabricated panel could effectively transfer the forces between two prefabricated panels.The mechanical performances of the new joint were superior to that of the cast-in-place panel,and the specimens were destroyed on both sides of the joint.Stirrups were used to replace the truss bar,and neither the precast layer nor the composite layer of the composite concrete slab at the joint of the specimen was not disengaged when the specimen was destroyed.It indicated that stirrup bars could effectively limit the development of cracks in the precast and composite layers of concrete.The experimental results of the composite concrete slab with different thickness showed that the bearing capacity and deformation capacity of the new joint could meet the design requirements.It could provide a new idea for design of long-span composite prestressed bi-directional concrete slabs.

关 键 词：拼缝 箍筋 受力性能 静载试验 拼缝构造 

分 类 号：TU378[建筑科学—结构工程]