基于多模态能量平衡法的层间隔震结构性能评估研究

Evaluation of Seismic Performance for Mid-story Isolation Based on MMEB

目的建立一种能够对层间隔震结构进行抗震性能评估的实用方法.方法通过建立层间隔震结构的简化动力方程,根据多模态能量平衡方法给出层间隔震建筑抗震性能评估方法的评估流程,并通过实际工程案例验证评估方法的精确度及可靠性.结果基于多模态能量平衡法的层间隔震抗震性能评估方法预测结果与弹塑性时程分析法计算结果平均值接近,误差为0~15%,在可接受范围内.结论笔者提出的层间隔震抗震性能评估方法可以考虑高阶振型的影响,流程清晰、精度可靠且计算简单,适用于层间隔震结构的抗震性能评估.

The aim is to establish a simplified evaluation method for seismic performance of mid-story isolation structures.The simplified system of a mid-story isolation structure is established,and the high-order vibration mode energy ratio associated with model-related parameters is examined.Based on the multi-modal energy balance principle(MMEB),a simplified evaluation method for seismic performance of mid-story isolation structures is proposed.Using examples demonstrate the validity of the method and the calculation accuracy.The results show that the predicted displacement distribution of each layer are equivalent to those calculated by elastoplastic time-history analysis.The calculation method proposed can take into account the influence of high-order mode,and it has the advantages of good seismic performance analysis and analysis accuracy.