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

许多根据旧的规范设计的现有建筑在最近的强烈地震中表现不佳（例如，1994年美国北岭，1995年日本兵库县南部）。这些事件造成的损害达到了前所未有的数字，导致了近代历史上一些最昂贵的自然灾害事件。由于破坏和侧向变形是相互关联的，地震中侧向位移的控制是提供破坏控制的关键。本研究的主要目标是：a)量化老建筑退化特征对横向位移的影响，b)建立位移放大系数的近似表达式。这些目标将通过计算受大型地震记录数据库影响的各种旧系统的横向位移来实现。对数据进行统计和回归分析，得到位移放大系数计算的简化表达式。该项目将与日本名古屋工业大学的调查密切合作进行。这项调查的结果将提供新的和需要的数据，这将使美国和日本的研究人员和实践工程师在评估和修复过程中做出更好的决定

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