在模态推覆分析( MPA) 方法的基础上，提出了改进的模态推覆分析( IMPA) 方法; IMPA 方法克服了MPA 方法采用固定加载模式的不足，考虑对结构屈服前后采用分段的加载机制进行推覆分析; 并通过两个算例对IMPA 方法、MPA 方法计算得到的结构顶点位移和层间位移角与弹塑性时程分析结果进行了比较． 结果表明，IMPA 方法在评估结构地震反应时较MPA 方法在精度方面有了较大的提高．

On the basis of the modal pushover analysis ( MPA) method, a method of improved modal pushover analysis ( IMPA) is proposed. This method overcomes the shortcomings of the fixed loading patterns of the MPA ( Modal Pushover Analysis) method, and its loading mechanisms before and after a structure yields are different. Then, by two examples, the IMPA method is compared with the MPA method in terms of roof displacement, interstory drift angle and elasto-plastic time-history. The results show that the IMPA method is much more accurate than the MPA method when the two methods are used to estimate the structural seismic response.