现浇混凝土空心楼板横向受剪试验研究

发布时间：2018-01-03 04:35

本文关键词：现浇混凝土空心楼板横向受剪试验研究　出处：《建筑结构学报》2015年05期 　论文类型：期刊论文

【摘要】：对混凝土空心楼板横向受剪时隔离体平衡和受剪破坏机理分析可知,肋宽和翼缘厚度是影响其受剪承载力的主要因素。进行了A、B两类18个现浇混凝土空心楼板试件的受剪试验,A类试件保持板厚和空心管直径不变,肋宽分别为50、75、100 mm,研究肋宽对受剪承载力影响;B类试件保持板厚不变和较大肋宽,上、下翼缘厚度分别为40、60、80 mm,研究翼缘厚度对受剪承载力影响。试验研究表明,在肋宽较小时,剪切破坏发生在肋上,裂缝先在孔内壁主拉应力较大处出现,随之近似水平开展并与相邻圆孔贯通,受剪承载力随肋宽的增大而增大;当肋宽较大时,空心板剪切破坏发生在上、下翼缘处,裂缝先在孔内壁靠近上、下翼缘位置出现,逐渐延伸到板的表面,受剪承载力与上、下翼缘厚度存在明显正比关系,承载力随翼缘加厚而线性增大。综合试验和理论分析结果给出了混凝土空心楼板横孔方向受剪承载力计算的双控计算式。
[Abstract]:The concrete hollow slab transverse shear isolation body balance and by analysis of shear failure mechanism, rib width and flange thickness are the main factors influencing the shear strength. The A, B two class 18 cast-in-place concrete hollow floor shear test specimen, specimen thickness and keep a the hollow pipe diameter unchanged, rib width were 50,75100 mm, study the rib width effect on the shear capacity; B specimens keep invariant thickness and large rib width, and flange thickness are respectively 40,60,80 mm, influence of flange thickness on shear capacity. Test results show that the rib width is small, the shear failure occurred in the ribs, cracks in the main draw hole wall stress is relatively large, with the approximate level to carry out and is communicated with the adjacent hole, the shear capacity with rib width increases; when the rib width is large, hollow plate shear failure occurred in the upper, lower flange. In the first crack The hole near the inner wall, the lower flange position, and gradually extended to the surface of the plate, and the shear capacity, there was proportional to the flange thickness, flange thickness and bearing capacity with a linear increase. The comprehensive experimental and theoretical analysis results are given for the double control of concrete horizontal hole hollow floor to shear calculation the bearing capacity calculation formula.

【作者单位】：中冶建筑研究总院有限公司;
【分类号】：TU375.2
【正文快照】： 0引言现浇圆孔空心板具有明显的正交各向异性,顺孔方向和横孔方向具有不同的受弯刚度[1-6],可以通过等效各向同性板方法[7-8]计算这种正交各向异性板的内力和变形,也可进行简化计算[9-10]。另外,顺孔方向和横孔方向由于圆孔布置形成的不同构造也使得两个方向受剪机理与受剪强

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