全预制空腔混凝土楼板受力性能试验研究  

Experimental Study on Mechanical Performance of Full Precast Cavity Concrete Slab

作　　者：郑志远 万方琪 张悦 Zheng Zhiyuan;Wan Fangqi;Zhang Yue(School of Urban Construction,Hubei Business College,Wuhan 430070,China)

机构地区：[1]湖北商贸学院城市建设学院,武汉430070

出　　处：《特种结构》2024年第5期13-16,86,共5页Special Structures

基　　金：湖北省住建厅建设科技计划项目(一种内置木丝水泥板的装配式全预制楼板受力性能与保温性能研究);湖北省教育厅科学技术研究计划指导性项目(B2021381)。

摘　　要：为研究一种单向贯通全预制混凝土楼板的受力性能,设计了一组3块单向贯通全预制板试件与现浇楼板进行抗弯性能对比,通过考察楼板破坏形式、跨中挠度变化、板内钢筋应力变化、板底混凝土应变变化等特性,得出各试验板在试验过程中未出现明显的脆性破坏现象,抗弯性能良好。试验板裂缝的开展情况表明全预制木丝混凝土楼板受力性能类似于现浇实心楼板,裂缝分布较为均匀。贯通类型相同的全预制板,其空腔尺寸越小,板的弯曲性能越好。所有空腔板极限承载力均高于实心板,相比实心板极限承载力提升约46.1%。相比全预制楼板,在同一荷载下实心板受拉区钢筋、板底混凝土的应变较大,板底荷载-拉应变曲线转折变化更明显。全预制板极限压应变在2000~3000微应变之间,实心板在1000~1500微应变之间。To study the influence of the mechanical performance of a unidirectional through precast concrete slab,a group of 3 unidirectional through precast slab specimens were designed to compare the bending performance with that of cast-in-place slabs.By investigating the characteristics of the slab failure form,mid-span deflection change,stress change of the reinforcement in the slab,and strain change of the concrete at the bottom of the slab,the following conclusions were drawn:No obvious brittle failure was observed during the test,and the bending resistance of each test plate was good.The crack development of the test slab shewed that the mechanical performance of the precast wood fiber concrete slab was similar to that of cast-in-place solid slab,and the crack distribution was more uniform.The smaller the cavity size,the better the bending performance of the fully prefabricated plate was with the same penetrating type.The ultimate bearing capacity of all cavity plates was higher than core plate,and the ultimate bearing capacity of core plate was increased by about 46.1%.Compared with the prefabricated slab,the strain of reinforcement bar and concrete at the bottom of solid slab under the same load was larger,and the curve of load-tension strain at the bottom of slab turned more obviously.The ultimate compressive strain of the full prefabricated plate was between 2000~3000 microstrain,and the solid plate was between 1000~1500 microstrain.

关 键 词：装配式结构 抗弯性能 全预制楼板 空腔楼板 单向贯通 

分 类 号：TU394[建筑科学—结构工程]