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共完成22块钢筋混凝土无腹筋简支单向板的受剪试验,分析了有无柱头、剪跨比、纵向配筋率对试验板的受剪承载力和破坏模式的影响,并采用非线性有限元软件ATENA对试验结果进行模拟;结合试验数据和收集到的无腹筋单向板、梁(有效高度大于500 mm)试验数据,对中国规范GB 50010—2010、美国规范ACI 318-11、欧洲规范EN 1992-1-1:2004的受剪承载力计算公式的准确性进行评估。结果表明:剪跨比、纵向配筋率等因素对单向板受剪破坏的影响与其对梁受剪破坏的影响类似;有限元分析结果能够从受力机理上反映柱头对单向板受剪承载力的影响;对于截面有效高度约150 mm的单向板,上述各规范的计算公式偏于安全,但是对于截面有效高度大于500 mm的厚板,特别是在配筋率较低的情况下,规范中的公式均存在不同程度的安全隐患。
A total of 22 reinforced concrete specimens without web tendons were tested, and the effects of stiffeners, shear span ratio and longitudinal reinforcement ratio on the shear capacity and failure mode of the test plates were analyzed. The nonlinearity The finite element software ATENA was used to simulate the test results. Based on the experimental data and the collected test data of unidirectional web and beam (effective height greater than 500 mm), the Chinese standard GB 50010-2010, the American standard ACI 318-11, Standard EN 1992-1-1: 2004 shear strength calculation formula to assess the accuracy. The results show that the influence of shear span ratio and longitudinal reinforcement ratio on the shear failure of one way slab is similar to that of the shear beam. The finite element analysis can reflect the effect of stigma on the shear strength of one- For the one-way slab with the effective height of about 150 mm, the above formulas are biased to be safe, but for slabs with an effective section height of more than 500 mm, especially in the case of low reinforcement ratio , The formula in the specification there are different levels of security risks.