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传统极限承载力分析的塑性铰法(PHM)及其修正格式(mPHM)没有考虑加载历史累积荷载效应对刚架失效的影响,不能正确处理内力反向问题,由此导致刚架结构极限承载力和失效模式分析结果出现错误。为此,首先研究了前序失效阶段累积荷载效应的影响,据此分析结构迭代计算中相邻迭代步出现内力反向时PHM和mPHM发生错误的原因;然后通过合理修改构件截面强度,以反映结构强度损伤演化规律,据此计算刚架结构极限承载力,并识别结构潜在失效模式,提出了刚架结构的失效判据,建立了刚架结构分析的改进塑性铰法(iPHM);最后,进一步通过iPHM与PHM、mPHM、弹塑性增量加载法对比分析,验证了iPHM的适用性、计算精度和效率。
The plastic hinge method (PHM) and its modified format (mPHM) of the traditional ultimate capacity analysis do not consider the influence of the cumulative load history of loading history on the failure of rigid frame and can not correctly deal with the inverse problem of internal force, which leads to the ultimate bearing capacity And failure mode analysis results error. Therefore, firstly, the effect of cumulative load effect in the pre-failure phase is studied. Based on this, the reasons for PHM and mPHM errors when the internal force is reversed in the adjacent iteration are analyzed. Then, by reasonably modifying the cross-section strength of the member to reflect According to this, the ultimate bearing capacity of rigid frame structure is calculated, and the latent failure mode of the structure is identified. The failure criterion of rigid frame structure is proposed and an improved plastic hinge method (iPHM) is established for structural analysis of rigid frame. Finally, Furthermore, iPHM was compared with PHM, mPHM and elasto-plastic incremental loading method to verify the applicability, accuracy and efficiency of iPHM.