Life Safety, Economic & Liability Risks Associated with Strengthened Unreinforced Masonry Buildings

惠蒂尔纳洛斯地震（1987年）和洛马普列塔地震（1989年）共震动了9286座未经加固的砖石建筑（UMB），这些建筑的修正Mercalli烈度为VI或更高。据报道，在两次地震之前已经翻新的建筑物中有599座受损。这为研究提供了重要的数据基础。某些现有的针对未加固砖石结构的建筑修复方案正在成为加州的标准，以及美国其他地区在减轻地震危害方面的榜样。这项研究工作的主要目标是为不同地震带的市政当局提供信息数据库、技术设计方案和法律分析，以选择恢复措施。它还将指导设计专业人员了解他们的修复责任和潜在责任。

The Whittier Narrows earthquake (1987) and the Loma Prieta earthquake (1989), collectively shook 9,286 unreinforced masonry buildings (UMB) in Modified Mercalli Intensity zone VI and higher. Damage was reported on 599 of the buildings which had been retrofitted prior to the two earthquakes. This provided a significant data base for study. Certain existing building rehabilitation schemes for unreinforced masonry structures are becoming standards for California and models for the rest of the U.S. in earthquake hazard mitigation efforts. The main goal of this research effort is to provide an informative data base, technical design alternatives, and legal analysis for municipalities in various seismic zones to use in selecting rehabilitation measures. It will also guide design professionals as to their rehabilitation responsibilities and potential liabilities.