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通过对弹性补偿有限元法的改进,提出可考虑恒荷载和活荷载同时作用的结构塑性极限分析方法。该方法利用弹性补偿有限元法采用迭代法进行极限分析的特点,在活荷载比例加载逼近极限荷载的同时,保持恒荷载作用效应不变,得到考虑恒荷载作用效应的工程结构极限承载力。典型算例的对比分析和影响因素研究表明,算法分析结果是收敛的、准确的和稳定的。
Through the improvement of finite element method for elastic compensation, a plastic limit analysis method is proposed to consider the simultaneous action of constant load and live load. This method utilizes the characteristics of limit analysis by the iterative method of elastic compensation FEM. When the live load ratio approaches the limit load, the effect of constant load is kept unchanged, and the ultimate bearing capacity of the engineering structure considering constant load effect is obtained. The comparative analysis of typical examples and the research of influence factors show that the results of algorithm analysis are convergent, accurate and stable.