New approaches to seismic design of steel framed buildings

钢框架建筑抗震设计新方法

• 批准号: 298297-2007
• 负责人: Koboevic, Sanda
• 金额: $ 1.24万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=365098
• 关键词: New; approaches; seismic; design; steel

The majority of the international seismic design provisions, including the National Building Code of Canada (2005), employ the principles of capacity design to obtain structures capable of withstanding seismic solicitations. Although the main design objectives are usually achieved using this approach, the method presents several intrinsic inconsistencies. For instance, the procedures used to predict design values of displacements and deformations are not transparent and rely on somewhat artificial rules which fail to reflect the complex interactions that exist in actual structures. For certain structural systems, this can result in an important increase of structural mass without significantly improving the seismic behaviour.The research program described herein aims to develop new design procedures for the seismic design of steel structures based on performance objectives. The studies will focus on (i) the definition of performance criteria and (ii) the preliminary development of design procedures. Initially seismic behaviour of eccentrically braced frames will be examined in the framework of the global structural response through extensive numerical studies and innovative experimental program using shaking table. In particular, the relationship between the inelastic shear link rotation and the inelastic storey drifts will be examined to define the drifts associated with specific link performance. Subsequently, different approaches to performance-based design will be assessed to determine the appropriate methodology for this system and to propose design procedures suitable for practical use. The results will help better understand the global behavior of buildings under seismic loads and contribute to develop Canadian code provisions for seismic design of steel structures.

大多数国际抗震设计规定，包括加拿大国家建筑规范(2005)，都采用能力设计原则，以获得能够承受地震请求的结构。虽然主要的设计目标通常是使用这种方法来实现的，但这种方法存在一些内在的不一致之处。例如，用于预测位移和变形的设计值的程序并不透明，并且依赖于某种人为的规则，这些规则无法反映实际结构中存在的复杂相互作用。对于某些结构体系，这可能会导致结构质量的显著增加，而不会显著改善抗震性能。本文所述的研究计划旨在开发基于性能目标的钢结构抗震设计的新设计方法。研究将集中于(1)业绩标准的定义和(2)设计程序的初步制定。首先，偏心支撑框架的抗震性能将在全球结构响应的框架内通过广泛的数值研究和创新的振动台试验程序进行检验。特别是，将研究非弹性剪力连接转动和非弹性层间位移之间的关系，以确定与特定连接性能相关的位移。随后，将对基于绩效的设计的不同方法进行评估，以确定适用于该系统的适当方法，并提出适合实际使用的设计程序。研究结果将有助于更好地了解建筑物在地震荷载作用下的整体性能，并有助于制定加拿大钢结构抗震设计规范条款。