摘要
基于无支撑钢筋桁架楼承板在施工过程存在普遍开裂的现象,以实际工程为例,开展有支撑与无支撑钢筋桁架楼承板混凝土浇筑及混凝土硬化过程中楼板体系变形的试验研究,分析从混凝土开始浇筑到硬化过程中楼板的裂缝与支撑立杆轴力的变化规律。试验结果表明:钢筋桁架楼承板体系的传力途径随着混凝土硬化和其强度发展发生质的变化,对跨度较大的板块设置支撑是解决楼板在混凝土硬化阶段裂缝较多的有效措施,实际工程不宜将跨度较大的板跨作为边板带,否则应设置支撑或其他有效措施,防止楼板在施工过程中出现早期变形过大的问题。
Based on cracks of unbraced steel-bars truss deck in the process of construction and the actual engineering,an experimental study was carried out on the deformation of floor system with braced or unbraced steel-bars truss deck from concrete casting to hardening and the change rules of both floor slab cracks and the axial force of the bracing pole from the concrete casting to the hardening were analyzed.The test results show that,with the concrete hardening and strength developing,the force transmission path of the steel-bars truss deck system has a qualitative change.Putting bracing to large-span plates is an effective measure to solve the cracks in the floor slab during the concrete hardening,but it is not advisable to use plates with a large span as the edge strip in practical engineering,otherwise bracing or other effective measures should be set up to avoid the large deformation of the floor slab in the early stage of construction.
作者
王金波
刘利先
WANG Jinbo;LIU Lixian(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500)
出处
《工业安全与环保》
2021年第5期34-37,41,共5页
Industrial Safety and Environmental Protection
关键词
钢筋桁架楼承板
现浇
裂缝
变形
steel-bars truss deck
cast-in-situ
crack
deformation
