Instability in Multistory Buildings Subjected to Earthquake

在强震中防止结构倒塌是抗震设计的一个公认目标。该项目通过确保建筑物在经历非弹性反应时不会倒塌，解决了实现这一目标的重要性。这项研究是一项努力的一部分，旨在提供一种实用可靠的方法来检查建筑物对非弹性动力失稳的安全性。该研究的具体目标是：a)研究识别运动机制的方法，该机制将控制建筑物对足够强的地面运动的动态响应。b)利用精确的数学模型计算若干具有代表性的建筑物和地面运动的失稳极限。c)在基于规范的抗震设计背景下，研究非弹性动力失稳问题，并制定设计指南。开发一种方法来检查不稳定性，这说明了问题的非弹性动力性质，目前被认为是提高抗震设计性能标准的优先需要之一。这项研究将有助于更好地理解如何防止单层和其他不良倒塌机制。

The prevention of structural collapse during an earthquake having a major intensity at a site is a well recognized objective of seismic design. This project addresses the importance in attaining this objective by ensuring that buildings will not fail while undergoing inelastic response. This research is part of an effort which seeks to provide a practical and reliable methods to check the safety of a building against inelastic dynamic instability. The specific objectives of the research are: a) To investigate the means of identifying the kinematic mechanism that will control a building's dynamic response to sufficiently strong ground motions. b) To calculate instability limits for a number of representative buildings and ground motions using accurate mathematical models. c) To examine the matter of inelastic dynamic instability in the context of code-based seismic design and develop recommended guidelines for design. The development of a method to check instability which accounts for the inelastic dynamic nature of the problem is currently recognized as one of the priority needs for improving seismic design performance standards. This research will lead to a better understanding of how to prevent single story and other undesirable collapse mechanisms.