Dynamic Analysis Procedures for Performance-based Seismic Engineering of Unsymmetric-plan Buildings

非对称平面建筑基于性能的抗震工程动力分析程序

• 批准号: 0336085
• 负责人: Anil Chopra
• 金额: $ 4.98万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-15 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0336085&HistoricalAwards=false
• 关键词: Dynamic; Analysis; Procedures; Performance; based

While nonlinear response history analysis (RHA) is the most rigorous procedure to estimate seismic demands for buildings, it remains impractical for widespread use by the profession. This is especially true for unsymmetric-plan buildings, which require three-dimensional analysis to account for coupling between lateral and torsional motions. Before nonlinear RHA can become a standard tool in structural engineering practice, commercial software must become more robust, reliable, and convenient for structural modeling, input data preparation, and interpretation of response results. The overall objective of this research proposal is to explore the possibility of developing an analytical procedure to estimate seismic demands for unsymmetric-plan buildings. This method must be sufficiently accurate and reliable for performance-based seismic engineering, but at the same time, it should not be so complicated that it is impractical for use by the profession. The challenge then is to develop a simplified method based on structural dynamics theory for nonlinear seismic demand analysis of buildings. A Small Grant for Exploratory Research (SGER) would provide an opportunity to explore the several conceptual issues that must be resolved before meeting this challenge. These issues include: coupling of x-lateral, y-lateral, and torsional motions of unsymmetric-plan buildings, and simultaneous action of two horizontal components of ground motion. The proposed research program will provide an opportunity to explore the feasibility of developing dynamic analysis procedures for performance-based seismic engineering of unsymmetric-plan buildings, considering various types of ground motions, including near-fault ground motions. The challenge is to develop a simplified method simpler than rigorous nonlinear RHA, rooted in structural dynamics theory for nonlinear seismic demand analysis of buildings. The method should be designed to work directly with the earthquake design spectrum, which is the standard approach to defining seismic hazard. If this exploratory research leads to promising results, it will provide the foundation for developing a novel procedure that is expected to be much superior than existing methods. Intellectual Merit: Based on structural dynamics theory, the MPA procedure has the potential to be a major improvement over other existing simplified methods for estimating seismic demands on buildings and other structures. It could provide a unified analytical formulation for tackling two- or .three-dimensional analysis of buildings for any type of excitation, near-fault or far-fault. Concepts underlying the MPA may be applicable to other classes of structures, e.g., bridges, intake-outlet towers, etc. The MPA procedure thus may open the door for research aimed at systematically developing approximate but rational methods for estimating the seismic demands for different classes of structures, recognizing their vibration properties. Broader Impact: This collaborative research program between Anil K. Chopra at the University of California, Berkeley, a major research institution, and Rakesh K. Goel at the California Polytechnic State University, San Luis Obispo, a primarily undergraduate university, could also lead to significant broader impacts, including integration of research into graduate and undergraduate education; increased participation of under-represented groups; broad dissemination of results to educators, researchers, engineers, and code-writing professionals; as well as integration of diversity into the NSF-sponsored research.

虽然非线性反应历史分析(RHA)是估计建筑物地震需求的最严格的程序，但它仍然不适用于该行业的广泛应用。对于不对称平面的建筑尤其如此，这需要进行三维分析来考虑横向运动和扭转运动之间的耦合。在非线性RHA成为结构工程实践中的标准工具之前，商业软件必须变得更加健壮、可靠，并且在结构建模、输入数据准备和响应结果解释方面更加方便。本研究方案的总体目标是探索开发一种分析程序来估计非对称平面建筑的地震需求的可能性。对于基于性能的地震工程，这种方法必须足够准确和可靠，但同时也不应该太复杂，以至于对专业人员来说是不切实际的。因此，面临的挑战是开发一种基于结构动力学理论的建筑物非线性地震需求分析的简化方法。一小笔探索性研究补助金(SGER)将提供一个机会，探讨在迎接这一挑战之前必须解决的几个概念性问题。这些问题包括：非对称平面建筑的X向、Y向和扭转运动的耦合，以及地面运动的两个水平分量的同时作用。拟议的研究计划将提供一个机会，探索开发基于性能的非对称平面建筑抗震工程动态分析程序的可行性，考虑各种类型的地面运动，包括近断层地震运动。挑战在于开发一种比严格的非线性RHA更简单的方法，这种方法植根于结构动力学理论，用于建筑物的非线性地震需求分析。该方法的设计应该直接与地震设计谱一起工作，这是定义地震危险的标准方法。如果这项探索性研究取得了有希望的结果，它将为开发一种新的程序提供基础，预计这种程序将比现有方法优越得多。智能优点：基于结构动力学理论，相对于其他现有的估计建筑物和其他结构的地震需求的简化方法，MPA程序有可能成为一个重大改进。它可以为处理任何类型的激励、近故障或远故障的建筑物的二维或三维分析提供统一的解析公式。MPA的基本概念可能适用于其他类型的结构，例如桥梁、进出水塔等。因此，MPA程序可能为旨在系统地开发近似而合理的方法来估计不同类型结构的地震需求的研究打开大门，认识到它们的振动特性。更广泛的影响：主要研究机构加州大学伯克利分校的Anil K.Chopra和以本科为主的加州理工州立大学的Rakesh K.Goel之间的这一合作研究项目也可能产生重大的更广泛的影响，包括将研究纳入研究生和本科教育；增加代表不足的群体的参与；向教育工作者、研究人员、工程师和代码编写专业人员广泛传播结果；以及将多样性纳入NSF赞助的研究。