密拼叠合板接缝构造与抗弯受力性能试验研究  

Study on the joint structure and bending resistance of composite slab connected without gap

作　　者：何庆锋[1] 杨凯华 HE Qingfeng;YANG Kaihua(School of Civil Engineering, Hunan University, Changsha 410000, China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410000

出　　处：《西安建筑科技大学学报（自然科学版）》2020年第5期684-692,共9页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家重点研发计划(2016YFC0701400)。

摘　　要：双向叠合板的拼缝性能是保持其整体性的关键.根据整体式拼缝构造优点,文章对原密拼拼缝叠合板进行了一定的改进,并对采用马镫钢筋作为抗剪拉结钢筋的该种密拼叠合板拼缝变化前后的受力性能进行了试验研究.通过四块简支板的静力加载试验,对规范密拼拼缝形式下的叠合板、改进后密拼缝叠合板的荷载挠度曲线、承载力、变形以及拼缝性能等进行了分析,并研究了其裂缝成因、拼缝处受力机理以及开裂荷载的计算.试验表明:规范分离式拼缝叠合板易产生沿着叠合面的撕裂破坏,其附加钢筋容易发生局部滑移或者锚固失效;构件屈服荷载受附加钢筋的粘结滑移影响有一定的降低,其破坏形态接近两折线形;改进后的拼拼缝叠合板其密拼钢筋的粘结滑移行为有较大改善,其屈服荷载基本达到其设计值,破坏形态以及变形曲线较原有密拼板丰满.The joint performance of the two-way composite slab is the key to the maintenance of its integrity.In this paper,the original close jointed composite slab is improved by combining the advantages of integral jointed structure and the mechanical properties of this kind of composite slab with stirrup reinforcement as shear tie reinforcement before and after the change of joint are studied.Through static loading test of four simply supported plates,the load deflection curve,bearing capacity,deformation and joint performance of the original composite slab and the improved composite slab are analyzed,and the causes of the cracks,the stress mechanism at the joints and the calculation of the cracking load are studied.Test results show that the standard split joint composite plate is easy to tear along the composite plane,and its additional reinforcement is easy to slip or cause anchor failure.The yield load of the specimen is affected by the bond slip of the additional reinforcement,and its failure mode is close to two fold linear.The bond slip behavior of additional reinforcement of the improved slab is improved greatly;its yield load basically reaches its design value;and its failure deflection is fuller than that of the original slab.

关 键 词：钢筋混凝土叠合板 密拼连接 马镫钢筋 拼缝受力机理 

分 类 号：TU375.2[建筑科学—结构工程]