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

虽然非线性反应时程分析（RHA）是最严格的程序来估计建筑物的抗震需求，它仍然是不切实际的广泛使用的专业。这对于非对称平面的建筑物尤其如此，这需要三维分析来考虑横向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强大，可靠和方便，用于结构建模，输入数据准备和响应结果的解释。本研究提案的总体目标是探索开发一种分析程序来估计非常规计划建筑物的抗震需求的可能性。这种方法必须足够准确和可靠的性能为基础的地震工程，但同时，它不应该太复杂，它是不切实际的专业使用。然后，挑战是开发一个简化的方法，基于结构动力学理论的非线性地震需求分析的建筑物。探索性研究小额赠款（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问题。这些问题包括：耦合的x-横向，y-横向，扭转运动的unconjunctive-plan建筑物，和同时行动的两个水平分量的地面运动。拟议的研究计划将提供一个机会，探讨开发动态分析程序的可行性，以性能为基础的抗震工程的unexplanic-plan建筑物，考虑各种类型的地面运动，包括近断层地面运动。挑战在于开发一种比严格的非线性RHA更简单的简化方法，该方法植根于建筑物非线性地震需求分析的结构动力学理论。该方法应设计为直接与地震设计谱一起工作，这是定义地震危险性的标准方法。如果这项探索性研究产生了有希望的结果，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上级得多。智力优势：基于结构动力学理论，MPA程序有可能是一个重大的改进，比其他现有的简化方法估计建筑物和其他结构的地震需求。它可以提供一个统一的分析公式，用于处理任何类型的激励，近断层或远断层的建筑物的二维或三维分析。MPA的基本概念可以适用于其他类型的结构，例如，因此，MPA程序可能会打开大门，研究旨在系统地开发近似但合理的方法，估计不同类别的结构的地震需求，认识到他们的振动特性。更广泛的影响：这个合作研究计划之间的阿尼尔K。乔普拉在加州大学伯克利分校，一个主要的研究机构，和Rakesh K。戈埃尔在加州理工州立大学圣路易斯奥比斯波，一个主要的本科大学，也可以导致显着的更广泛的影响，包括研究整合到研究生和本科教育;增加参与的代表性不足的群体;广泛传播的结果，教育工作者，研究人员，工程师，和代码编写专业人士;以及整合多样性到NSF赞助的研究。

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.