U.S.-Japan Cooperative Program: Displacement Amplification Factors for the Seismic Evaluation and Retrofit of Existing RC Frames

许多根据旧规范规定设计的现有建筑物在最近的强震中表现不佳（例如，1994美国北岭1995 Hyogo-Ken Nanbu，日本）。 这些事件造成的损失达到了前所未有的数字，导致了近代历史上一些代价最高的自然灾害事件。 由于损伤和侧向变形是相互关联的，地震过程中侧向位移的控制是提供损伤控制的关键。本研究的主要目的是：a）量化旧建筑物的退化特性对侧向位移的影响; B）开发近似表达式来计算位移放大系数。 这些目标将通过计算受到地震记录的大型数据库的各种旧系统的横向位移来实现。 将对数据进行统计和回归分析，以开发用于计算位移放大系数的简化表达式。 该项目将与日本名古屋技术研究所的调查密切合作进行。 这项调查的结果将提供新的和所需的数据，使研究人员和执业工程师能够在美国和日本的评估和康复程序中做出更好的决定

Many existing buildings designed according to older code provisions have performed poorly in recent strong earthquakes (e.g., 1994 Northridge, U.S., 1995 Hyogo-Ken Nanbu, Japan). The damage caused by these events reached unprecedented figures which resulted in some of the costliest natural hazard events in recent history. Since damage and lateral deformations are interrelated, the control of lateral displacement during an earthquake is key to providing for damage control.The main objectives of this investigation are: a) to quantify the influence of the degrading characteristics of older buildings on the lateral displacements and b) to develop approximate expressions to compute displacement amplification factors. These objectives will be accomplished by computing the lateral displacement of a variety of older systems subjected to a large database of earthquake records. Statistical and regression analysis of the data will be conducted to develop simplified expressions for the calculation of displacement amplification factors. The project will be conducted in close collaboration with investigation at Nagoya Institute of Technology in Japan. The results of this investigation will provide new and needed data that will allow researchers and practicing engineers to make better decisions in their evaluation and rehabilitation procedures in both the U.S. and in Japan