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考虑翼缘弹性转动约束的腹板在弯、剪应力单独作用下的临界屈曲应力表达式可通过里兹能量法进行推导,然而在运用里兹能量法求解弹性转动约束边界下弯、剪复合作用的腹板临界屈曲应力时,会出现难以求解的复杂偏微分式。为掌握边界弹性转动约束的组合梁腹板在弯、剪复合作用下的屈曲特性,该文建立了考虑翼缘弹性转动约束的腹板有限元模型,分析腹板上、下边界弹性转动约束系数χ、弯剪应力比η、弯曲荷载应力梯度λ、宽高比γ等参数对腹板弯、剪复合屈曲的影响。根据有限元计算结果重新拟合弹性转动约束的弯、剪复合屈曲修正方程,与一个钢-混组合梁负弯矩区腹板屈曲试验结果比较,试验结果与修正曲线误差为2.5%。
The critical buckling stress expression under the action of bending and shearing stress can be deduced by the method of Ritz energy. However, in the application of Ritz energy method to solve the bending and shearing effect of the elastic rotation constraint boundary The critical buckling stress of the web, there will be difficult to solve the complex partial differential. In order to know the buckling behavior of the composite web under the combined bending and shearing of the boundary elastic rotational constraint, a finite element model of the web considering the elastic rotation constraint of the flange is established. The elastic rotation restraint coefficient χ, bending shear stress ratio η, bending load stress gradient λ, aspect ratio γ and other parameters on bending and shearing of webs. According to the results of finite element analysis, the bending and shear combined buckling correction equations with elastic rotational constraint were re-fitted. Compared with the web buckling test results of the negative bending moment zone of a steel-concrete composite beam, the error of the test results and the correction curve was 2.5%.