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在实际工程中,通常采用换算截面法计算组合梁应力,而不考虑截面滑移的影响。但是当组合梁采用部分剪力连接或者需要考虑疲劳问题时,忽略滑移的影响可能会引起较大的误差。该文推导了考虑界面滑移效应的简支组合梁在多种荷载工况下的弯曲应力和界面剪力的解析解,并据此进行分析,得到了弯曲应力和界面剪力在各种荷载工况下的变化规律。根据实际情况,对最不利位置的解析解进行了简化。经对比,简化计算公式的计算结果与解析解吻合良好。
In practical engineering, the stress of the composite beam is usually calculated by the method of the modified section, irrespective of the effect of section slip. However, neglecting the effects of slippage can cause large errors when the composite beams are partially sheared or require fatigue considerations. In this paper, the analytical solutions of bending stress and interfacial shear of simply supported composite beams considering interfacial slippage effects under various loading conditions are deduced. Based on this analysis, the bending stresses and interfacial shear forces are obtained under various loads Variation under conditions. According to the actual situation, the analytical solution of the most unfavorable position has been simplified. By comparison, the calculated results of the simplified calculation formula agree well with the analytical solutions.