新型叠合板力学性能试验  

Mechanical Properties Test of New Type of Laminated Slab

作　　者：吴方伯[1] 秦浩 文俊 李博 周绪红[1,2] WU Fang-bo;QIN Hao;WEN Jun;LI Bo;ZHOU Xu-hong(College of Civil Engineering,Hunan University,Changsha 410082,Hunan,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]重庆大学土木工程学院,重庆400045

出　　处：《建筑科学与工程学报》2020年第1期33-40,共8页Journal of Architecture and Civil Engineering

基　　金：“十三五”国家重点研发计划项目(2016YFC0701308)

摘　　要：为了分析叠合板在使用阶段的性能,如挠度、钢筋应力-应变曲线等,进行了1块现浇板与1块新型叠合板的静力加载试验。试验采用大型反力架、液压千斤顶与两级分配梁作为加载工具,对带可拆桁架叠合简支板与现浇简支板进行四点加载,以模拟均布荷载作用下板的受力状态,并对试验数据进行对比。结果表明:叠合板挠度满足使用阶段的要求,延性性能良好;叠合板在最终加载结束时产生了与现浇双向板相似的裂缝;板底裂缝首先出现在4个加载点的下方,并随着后续加载由4个加载点向叠合板的4个角延伸,裂缝出现的形态表明叠合板在破坏时钢筋的受拉性能得到了充分利用;在最后一级加载完成后叠合板顶面混凝土没有被压溃,说明叠合板依然具有继续承载的能力;预埋件与混凝土的黏结性能良好,预埋件周边混凝土未出现大面积的破坏;在构件的侧面发现了若干条竖向裂缝,叠合面上未发现横向裂缝,说明表面刮毛可以满足叠合面的抗剪要求。In order to analyze the performance of laminated slab in service, such as deflection, stress-strain curve of steel bars, the static loading test of a cast-in-place slab and a new type of laminated slab was carried out. In the test, the large reaction frame, a hydraulic jack and a two-stage distribution beam were used as loading tools for four-point loading on the composite simply supported slab with detachable truss and the cast-in-place simply supported slab to simulate the stress state of the slab under uniform load, and the test data were compared. The results show that the deflection of the laminated slab meets the requirements of the use stage, and the ductility is good. At the end of the final loading, the cracks of the laminated slab is similar to the cast-in-place two-way slab. The cracks at the bottom of the slab first appear below the four loading points, and with the subsequent loading from four loading points to four corners of the laminated slab. The appearance of cracks indicates that the tensile properties of steel bars are fully utilized when the laminated slab are damaged. After the last stage of loading, the concrete on the top of the laminated slab is not crushed, this indicates that the laminated slab still has the capacity of continuous bearing. The bonding performance between the embedded parts and concrete is good, and the concrete around the embedded parts is not damaged in a large area. Several vertical cracks are found on the side of the component, and no transverse cracks are found on the laminated surface, which shows that the surface scratching can meet the shear requirements of the laminated surface.

关 键 词：叠合板 力学性能 四点加载 挠度 承载力 

分 类 号：TU311[建筑科学—结构工程]