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模态静力弹塑性分析法中,动力时程分析部分的可操作性较差,且分析结果不稳定。用能力谱法替代原有的动力时程分析,在现行规范加速度反应谱基础上计算结构各振型等效单自由度体系各性能水平的位移反应,然后将其转化为相应多自由度结构的位移反应,并通过平方和开方法求得结构的总位移反应,用其与结构某一性能水平的位移(层间位移角)限值进行比较,判断设计结果是否满足性能目标要求。该方法改善了模态静力弹塑性分析法的可操作性,使其评估结果更加稳定。
In the modal static elasto-plastic analysis method, the maneuvering time history analysis part is poor in maneuverability and the analysis result is not stable. By using the power spectrum instead of the original dynamic time history analysis, the displacement response of each single-degree-of-freedom system with various vibrational modes of the structure is calculated on the basis of the current standard acceleration response spectrum, which is then transformed into the corresponding multi-degree-of-freedom structure Displacement reaction is carried out. The total displacement response of the structure is calculated by the square sum method. The displacement of the structure is compared with the limit of displacement of a certain level of structure to determine whether the design result meets the performance target requirement. This method improves the maneuverability of modal static elasto-plastic analysis and makes the result of evaluation more stable.