摘要
通过将楼板的上层钢筋和楼板底部配筋用直径为3～6mm的细钢筋作为腹杆焊接连接,形成桁架,并在底部焊接一层厚度为0.4～0.6mm的薄钢板,就可以节省施工节点的模板费用,加快施工进度.这种楼板施工方法称为自承式模板.本文对自承式模板在施工阶段的挠度和钢筋应力进行了试验,验证了施工阶段可以采用上下弦连续的桁架计算模型,对正常使用阶段的楼板刚度和极限承载力也进行了试验研究,结果表明,自承式模板的楼板,由于在施工阶段楼板混凝土和钢筋自重在混凝土内不产生应力,这种楼板在使用状态下基本不开裂,和普通支模板的混凝土楼板相比可以改善抗裂性能,使用阶段楼板的刚度也比普通混凝土楼板大,但是极限承载力和普通楼板相同.
Connecting top and bottom rebars of the floor slab with web-rebars of diameter 3～6mm, trusses are formed which can carry the vertical loads during slab construction after a thin steel plate with thickness of 0.4～0.6mm is attached at the bottom.This saves the cost of formwork, and shortens the construction period.This paper reported a test on this self-supported slab system. The aim of this test is to verify the mechanical model used to calculate the slab deflection and stresses in the rebars during construction and the behaviour of the slab under the working load and its ultimate load-carrying capacity. Seven simply supported slabs are tested. It is found that the truss model with its chords to be continuous and webs to be pined to the chord may closely predict the slab deflection and the stresses of the rebars during construction. This slab is nearly uncracked under working load because the self weight of the slab does not produce tensile stress in the concrete so the stiffness is greater compared with the common concrete slab with formwork. However,the ultimate load carrying capacity of this salb is the same as the common concrete slab.
出处
《建筑钢结构进展》
2005年第3期16-22,8,共8页
Progress in Steel Building Structures
