Presidential Young Investigators Award

该项目得到了 总统青年调查员 奖励计划（PYI）。 项目 从1991财政年度开始， 期 该项目的目标是 进行以下研究： (a)更一般类型的分析 基于弹性和 钢的非弹性建模，钢筋混凝土， 和砖石结构。 效果 各种结构和 碰撞激励参数 反应和损害将是 明确了 发展一个非常 简单实用的评估工具 抗震性能已经 现有建筑或新建建筑 设计的建筑物， 撞击事件 述的方法 将通过将其 结果与碰撞损坏 现有建筑物。 发展 冲击缓解方案。 研究 基础隔震的碰撞问题 系统 振动台试验研究 相邻建筑物的撞击 钢筋混凝土钢，和砖石 建设 现有测试模型 将被修改和测试， 用振动台研究敲打。 (b)灵活的应用 用于（EBF）偏心的连接 支撑框架，以抵抗风或 中度地震 真实的尺寸 将进行实验， 研究极限强度， 变形，抗疲劳性， 和链路的故障模式 采用柔性连接。 非线性分析连杆单元 将被修改以模拟 链接的行为， 灵活的连接，以及全球 行为的EFB采用 将进行研究。 基于 在此基础上， 柔性连接以及 将提出EFB。 这项研究将提高 对建筑物撞击的理解 在城市环境中， 最小化建模的技术 不准确性，并改善 基于偏心知识 支撑框架体系

This project is supported under the Presidential Young Investigator Award Program (PYI). The project is initiated in FY 91 for a 5-year period. The objectives of the project are to conduct the following studies: (a) Analysis of more general types of pounding based on elastic and inelastic modeling of steel, RC, and masonry structures. The effect of various structural and excitation parameters on pounding response and damage will be clarified. Development of a very simple and practical tool to assess seismic performance of already existing buildings or newly designed buildings against possible pounding incidents. The method will be verified by correlating its results with pounding damage of existing buildings. Development of pounding mitigation scheme. Study on pounding of base isolation system. Shaking table tests for pounding of adjacent buildings of steel, R.C., and masonry construction. Existing test models will be modified and tested to study pounding using shake table. (b) Application of flexible connections for (EBF) Eccentrically Braced Frames to resist winds or moderate earthquakes. Real size experiments will be conducted to investigate ultimate strength and deformation, fatigue resistance, and failure modes of the link employing the flexible connection. Nonlinear analysis link element will be modified to simulate the behavior of the link with the flexible connection, and global behavior of an EFB employing the connection will be studied. Based on these, design method for the flexible connection as well as the EFB will be proposed. This research will enhance the understanding of building pounding in the urban context by developing techniques which minimize modelling inaccuracies and improve the knowledge base on eccentrically braced frame systems.