ABSTRACT This paper discusses and quantifies the minimum requirements of walls and tie-columns in confined masonry (CM) buildings located in earthquake-prone regions. A research database including 238 damaged CM buildings obtained from the 2008 Wenchuan earthquake survey is established and comprehensively examined. The requirements of masonry walls in CM buildings are discussed, and a simplified tie-column density index is proposed for evaluating the potential damage of the structures. Besides, the minimum requirements of reinforced concrete tie-columns and their maximum allowable spacing in CM buildings at different seismic intensity zones are discussed.

中文翻译：

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地震带密闭砌体建筑物墙体和拉杆柱的简化密度指标

摘要 本文讨论并量化了位于地震多发地区的密闭砌体 (CM) 建筑中墙和拉杆的最低要求。建立并综合研究了2008年汶川地震调查中获得的238座受损CM建筑的研究数据库。讨论了CM建筑对砌体墙的要求，并提出了一种简化的系柱密度指数来评估结构的潜在损坏。此外，讨论了不同地震烈度区的CM建筑中钢筋混凝土连接柱的最低要求及其最大允许间距。