中文摘要：

四川汶川5·12地震及随后的多次余震导致绵竹市底框房屋遭受不同程度的破坏．根据震损房屋安全鉴定结果，分析底框房屋震损特征和原因，提出采用钢结构快速加固的目标、思路、基本方案，讨论需要重视的关键问题，结合某底框商住楼给出3种钢结构快速加固方案：增设摩擦耗能钢支撑加固、增设钢隅撑支撑加固、增设钢支撑十层间隔震加固方案，可供绵竹市灾后恢复重建以及其他地区底框房屋抗震加固参考．

英文摘要：

Many multi-story Wenchuan Earthquake and masonry buildings with bottom-frame in Mianzhu City were damaged in 5· 12 subsequent aftershocks. According to the results of earthquake damaged building safety assessment, the characteristics and reasons of earthquake damaged multi-story masonry buildings with bottom-frame were analyzed. The targets, considerations and basic planning of rapid strengthening with steel structures are presented, and the key-problems were discussed. Combining with one multi-story masonry building with the bottom-frame, three kinds of basic planning were proposed： adding friction energy dissipation steel braces, adding steel knee-braces, adding steel braces and inter- layer seismic isolation. They can be regard as a useful reference for the post-disaster reconstruction and strengthening in Mianzhu City and other regions.