Improving Seismic Performance of Asymmetric Buildings: Plan-wise Distribution of Supplemental Damping

对称的建筑（质量、刚度和/或强度分布不规则的建筑）特别容易受到地震的影响。该研究项目的主要目的是开发必要的背景和指导方针，以通过使用补充阻尼来改善非对称建筑的抗震性能。第一阶段的研究将集中在具有非延性结构元件（梁，柱，墙等）的建筑物上，这些结构元件可以允许没有损坏或非常有限的损坏，即必须在或接近线性弹性范围内响应的建筑物。这是一门重要的课。许多位于高震区的老建筑，如加利福尼亚（在现代抗震规范制定之前设计的），以及大多数位于低至中等震区的新建筑，如美国中部和东部，都属于这一类。第二阶段将重点关注具有延性结构元素的建筑物，即允许在非弹性行为范围内做出反应的建筑物，但元素需求（位移，延性或能量）必须集中在使用带有补充阻尼装置的非对称建筑物的大型模型的概念验证实验上。目前，正在为三个阶段中的前两个阶段提供资金；最后阶段的经费将在前两个阶段圆满完成后请求提供。所进行的调查将有助于开发改进的非对称建筑的地震保护方法，这类建筑特别容易受到地震的影响，但并不总是可以避免。从拟议的研究中产生的指导方针和简化的设计程序也将导致基于性能的地震标准的改进，例如FEMA-273。

A symmetric building (buildings with irregular distribution of mass, and/or stiffness, and/or strengths in their floor plans) is especially vulnerable to earthquakes. The primary objective of the research project is to develop the background and guidelines necessary to improve seismic performance of asymmetric buildings by using supplemental damping.The first phase of research will focus on buildings with non-ductile structural elements (beams, columns, walls etc.) that can be allowed to experience no damage or very limited damage, i.e., buildings that must respond in or close to the linearly elastic range of behavior. This is an important class. Many older buildings in high seismic regions like California (designed prior to the development of modern seismic codes) as well as most newer buildings in low to moderate seismic regions like central and eastern U.S. of all in this category. The second phase will focus on buildings with ductile structural elements, i.e., buildings that may be permitted to respond in the inelastic range of behavior but the element demands (displacement, ductility, or energy) must focus on proof-of-concept experiments using large scale models of asymmetric buildings with supplemental damping devices. At present, funding is being provided for first two of the three phases; funding for the final phase would be requested after successful completion of the first two phases.The investigation undertaken will enable the development of improved methods for seismic protection of asymmetric buildings, a class that is especially vulnerable to earthquakes but not always possible to avoid. The guidelines and simplified design procedures that will result from the proposed research would also lead to improvements in performance-based seismic standards such as FEMA-273.