Design of gravity force-resisting systems accounting for seismic displacement demands

考虑地震位移需求的抗重力系统设计

基本信息

批准号：
543549-2019
负责人：
MolinaHutt, Carlos
金额：
$ 1.53万
依托单位：
University of British Columbia
依托单位国家：
加拿大
项目类别：
Engage Grants Program
财政年份：
2019
资助国家：
加拿大
起止时间：
2019-01-01 至 2020-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=677722
关键词：
Design gravity force resisting systems

项目摘要

The structural system in a building must be designed to resist both vertical loads from gravity, as well as lateral loads imposed by wind or seismic action. It is common in structural design for the structural frame to consist of two separate systems: a gravity force-resisting system and a lateral force-resisting system. While seismic codes have traditionally focused on the design requirements of lateral force-resisting systems, ground shaking due a seismic event will cause the entire structure to deform, i.e. it will impose deformation demands both in the gravity and the lateral force-resisting systems. In this regard, the latest edition of the concrete design standard in Canada recognizes that failure of gravity frames is one of the most common causes of building collapse during an earthquake. Thus, the code introduced a new requirements intended to ensure adequate levels of strength and ductility in elements that are not part of the seismic force-resisting system, but are subjected to seismically induced deformations. Conventional structural design relies on equivalent linear elastic analysis models to replicate anticipated nonlinear response in buildings. However, this new requirement of the concrete design standard in Canada does not address how to accurately develop this equivalent linear elastic analysis model for the seismic design of gravity frames. To address this challenge, Glotman Simpson is partnering with the University of British Columbia to develop a procedure that provides consistent and trustworthy results to facilitate these new design checks of gravity frames per the latest code requirements. This work will facilitate the continued delivery of safe and economical designs.

建筑物的结构系统必须设计成能够抵抗重力引起的垂直载荷以及风或地震作用施加的横向载荷。在结构设计中，结构框架通常由两个独立的系统组成：抗重力系统和抗侧向力系统。虽然地震规范传统上侧重于抗侧力系统的设计要求，但地震事件引起的地面震动会导致整个结构变形，即它将对重力和抗侧力系统提出变形要求。在这方面，加拿大最新版本的混凝土设计标准承认，重力框架的失效是地震期间建筑物倒塌的最常见原因之一。因此，该规范引入了一项新要求，旨在确保不属于抗震系统但会遭受地震引起变形的元件具有足够的强度和延展性水平。传统的结构设计依赖于等效线弹性分析模型来复制建筑物中预期的非线性响应。然而，加拿大具体设计标准的这一新要求并没有解决如何准确开发这种用于重力框架抗震设计的等效线弹性分析模型。为了应对这一挑战，Glotman Simpson 正在与不列颠哥伦比亚大学合作开发一种程序，提供一致且值得信赖的结果，以促进根据最新规范要求对重力框架进行新的设计检查。这项工作将有助于持续交付安全且经济的设计。