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为研究骨料种类对无腹筋梁受剪性能的影响,以剪跨比和纵筋配筋率为变量,进行了16根集中荷载作用下的无腹筋混凝土简支梁受剪性能试验,其中8根采用普通碎石混凝土,8根梁采用页岩陶粒(轻骨料)混凝土,对轻骨料和普通混凝土梁的裂缝发展、破坏形态、斜向开裂荷载、受剪承载力、跨中挠度、裂缝面相对位移等进行了观察和测量。对比分析表明:轻骨料混凝土梁的斜向开裂荷载和受剪承载力均低于普通混凝土梁,其裂缝面较普通混凝土的更加光滑;将轻骨料混凝土梁受剪承载力试验值与采用我国JGJ 12—2006《轻骨料混凝土结构技术规程》和美国规范ACI 318-11、加拿大规范CSA 23.3-04、欧洲规范EC 2方法的计算值进行对比分析,结合此次试验结果和从国内外文献中搜集的126组已有试验数据,对我国JGJ 12—2006的受剪承载力公式的准确性和安全性进行探讨,提出了无腹筋轻骨料混凝土梁受剪承载力计算的建议公式。
In order to study the effect of aggregate types on the shear behavior of non-web beams, the shear-resistance tests of 16 RC beams with concentrated webs under concentrated loads were carried out with the shear span ratio and the longitudinal reinforcement ratio as the variables, of which 8 The common crushed stone is used for the root and the shale ceramsite (lightweight aggregate concrete) is used for the eight beams. The crack development, failure mode, diagonal cracking load, shear capacity, midspan deflection of lightweight aggregate and common concrete beam , The relative displacement of fracture surface were observed and measured. The comparative analysis shows that the diagonal cracking load and shear capacity of lightweight aggregate concrete beam are lower than that of ordinary concrete beam, and the crack surface is smoother than ordinary concrete. The test values of shear capacity of lightweight aggregate concrete China JGJ 12-2006 “lightweight aggregate concrete technical specifications” and the United States Code ACI 318-11, Canadian norms CSA 23.3-04, the European norms EC 2 calculated value of the comparative analysis, combined with the test results and from domestic and foreign 126 sets of existing experimental data collected in the literature are used to discuss the accuracy and safety of the formula of the shear capacity of JGJ 12-2006 in China. The formula for calculating the shear capacity of non-cored lightweight aggregate concrete beams is proposed.