• 1. existing building structures: 已建建筑结构
• 2. storey-adding of existing building structures: 既有房屋加层
• 3. existing building masonry structures: 既有砌体结构

• 1.That\\\'s hard to say, because the existing building structures are much, much larger.
  很难说，因为那里的建筑结构种类实在太多。
  dict.yoduao.com
• 2.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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• 3.Occasionally structures are designed from scratch when the existing building has collapsed beyond repair.
  偶尔会有现存的建筑物已经倒塌而无法修复时需要重新临时设计结构。
  dict.yoduao.com

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