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

惠蒂尔海峡地震（1987年）和洛马普列塔地震（1989年），总共震动了9,286座无钢筋砌体建筑（UMB），这些建筑都在修正的麦加利烈度区VI或更高。据报告，在两次地震前进行过改造的建筑物中，有599座遭到破坏。这为研究提供了重要的数据基础。某些现有的无钢筋砌体结构的建筑物修复计划正在成为加州的标准和美国其他地区在减轻地震灾害方面的典范。这项研究工作的主要目标是提供一个信息丰富的数据库，技术设计的替代方案，和法律的分析，在不同的地震区的市政当局用于选择恢复措施。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.