Implication of Northridge Earthquake on 1994 NEHRP Provisions and Seismic Restraint Performance on Nonstructural Components

在大地震中观测到的非结构损伤在研究非结构构件地震行为的广泛研究问题中起着重要作用。其中包括制定非结构构件的规范和规定，规定这些构件必须锚定或附着在主要结构上的安全级别，以及制定其锚定细节和约束的抗震设计指南。本研究项目的目标是评估北岭地震对下列两个具体和相互关联的研究问题的影响：(a)最近建议的1994年NEHRP关于非结构部件的规定。Northridge损伤数据为评估力和位移公式中包含的各种动态影响因素的值提供了独特的机会。(b)位于受影响地区的一组选定的抗震装置的性能，其中一些是最近才开发的。Northridge事件为在实际代码级地震下评估它们的性能提供了第一次机会。这项研究的结果将有助于更好地理解非结构构件在各种条件下的抗震性能。反过来，这些结果将导致在地震环境中操作这些组件的更安全，更合理的设计指南的发展。＊＊＊

9416480 Soong Observed nonstructural damage during major earthquakes has played an important role in the investigation of a wide range of research issues dealing with seismic behavior of nonstructural components. These include the formulation of codes and provisions for nonstructural components which specify safety levels at which these components must be anchored or attached to a primary structure and the development of seismic design guidelines for their anchorage details and restraints. The objectives of this research project ar to assess the impact of the Northridge earthquake on the following two specific and interlocking research issues: (a) The recently recommended 1994 NEHRP provisions for nonstructural components. The Northridge damage data provides a unique opportunity for assessing the values assigned tovarious dynamic-effect factors contained in the force and displacement formulas. (b) The performance of a selected group of seismic restraints located in the affected area, some of which were only recently developed. The Northridge event provides the first opportunity for evaluating their performance under an actual code-level earthquake. The results of this research will lead to a better understanding of the seismic behavior of nonstructural components under a wide variety of conditions. In turn, these results will leade to the development of safer and more rational design guidelines for operating these components in a seismic environment. ***