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主要分析组合梁的性能,特别是板的有效宽度,可用于简化结构分析和设计。现行设计规范提出的计算有效宽度的公式中,只考虑梁跨长而忽略了其他重要参数的影响。为了说明这些参数的影响,本文对多个三维模型进行数值模拟分析,并且由此提出计算有效宽度的新方法。相比其他基于综合压力的分析方法,此方法更容易应用,并且在简化方法中,它提供的有效宽度数值能更真实地反映梁的实际状态。新方法的应用表明有效宽度主要与实际板宽有关,在大多数情况下,这个数值与规范提议的数值有明显的差别。新方法的有效性通过对比简化的二维模型和最近试验研究的结果以及更复杂的三维数值模拟而得到验证。
The main analysis of composite beam performance, especially the effective width of the plate, can be used to simplify structural analysis and design. In the formula for calculating the effective width proposed by the current design code, only the length of the beam is considered and the influence of other important parameters is neglected. In order to illustrate the influence of these parameters, several 3D models are numerically simulated and a new method of calculating the effective width is proposed. This method is easier to apply than other methods based on comprehensive stress analysis, and in the simplified method it provides a more realistic representation of the true beam behavior with the effective width values. The application of the new method shows that the effective width is mainly related to the actual width, which in most cases is significantly different from the proposed value. The effectiveness of the new method is verified by comparing the simplified two-dimensional model with the results of the most recent experimental studies and the more complex three-dimensional numerical simulations.