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教室的两层使用了木框架结构，跨在公共应急避难所的上方，在不改变后者结构的条件下满足了抗震要求。
The two storeys of classrooms are built using a wooden frame to allow earthquake-resistant construction over the public emergency shelter without altering the structure of the latter.
本文作者利用清华大学的拟动力试验系统进行了两层两跨钢筋混凝土框架结构的地震反应试验研究。
The on-line test of two-story and two-span R/C frame under earthquake is presented in this paper.
某居民楼原为八层钢筋混凝土框架结构，后加建两层。
A8-storeyed reinforced concrete frame building is added two floors.
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