已建建筑结构
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storey-adding of existing building structures 既有房屋加层
existing building masonry structures 既有砌体结构
·2,447,543篇论文数据，部分数据来源于NoteExpress
But the seismic performance of the masonry walls isn't researched systemically, and this makes a new project design and assessment of existing building structures lack of basis.
但由于国内对该类墙体的抗震性能未进行系统的研究，使新建工程的设计和已建工程的评估缺少依据。
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