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基于空腹桁架破坏机理,根据腹板开洞组合梁在极限状态下的洞口区域塑性应力分布建立洞口4个次弯矩函数。提出了一种带加劲肋腹板开洞组合梁极限承载力的计算方法,该方法考虑了洞口上方混凝土板对组合梁的竖向抗剪承载力的贡献。计算结果表明:洞口设置加劲板能有效的提高腹板开洞组合梁的抗弯和竖向抗剪承载力,而且竖向抗剪承载力随着加劲板面积的增大而增大,混凝土板对组合梁的抗剪承载力有较大的贡献。并与试验和有限元结果进行了比较,结果吻合较好,算例验证了该计算方法的准确性和可靠性。
Based on the failure mechanism of the fasting truss, the four times-bending moment functions of the hole are established according to the plastic stress distribution in the hole region under the ultimate state of the composite beam with web openings. A method to calculate the ultimate bearing capacity of a composite beam with web stiffener webs is proposed. The method takes into account the contribution of the concrete slab above the opening to the vertical shear strength of the composite beam. The calculation results show that the stiffener plate can effectively improve the flexural and vertical shear strength of composite beam with web opening, and the vertical shear capacity increases with the increase of stiffener area. Shear strength of composite beam has a greater contribution. Compared with the experimental results and the finite element results, the results are in good agreement. The example shows that the method is accurate and reliable.