Research in Support of a Transparent Seismic Design Methodology

9322524 Krawinkler这一研究项目将开发所需的基本数据，以正式确定和实施基于需求/能力的地震设计方法，明确考虑结构的非弹性响应特征。其目的是使设计过程透明，并同样适用于现有结构的抗震评估和新结构的抗震设计，使用传统结构系统以及新的结构系统、材料和创新的耗能或基础隔震系统。设计目标是提供具有足够的强度、刚度和延性的结构，以使设计地震施加的变形要求不超过与设计极限状态(例如，适用性、倒塌安全性)相关的变形能力。它的目的是为可能位于不同地震活动地区的不同配置和结构体系的结构实现一致的抗震保护水平。拟议的研究旨在通过集中于以下目标来实现这一目标：(1)评估、改进、修改和发展(如果需要)可以基于一致和透明的抗震设计方法的基本概念；(2)开发一套关于非弹性单自由度体系地震需求参数的综合信息，这将构成多自由度结构设计的基础；(3)发展修改单自由度需求参数所需的知识，以考虑真实多自由度结构中存在的多振型效应；(4)调查预期累积损伤效应的地面运动特性的影响；以及(5)对所提出的抗震设计方法进行形式化和测试，以使其对工程专业有用。项目中产生的关于需求和能力的信息将对知识状况产生影响，并将促进和加速采用更加现实和透明的设计程序。***

9322524 Krawinkler This research project will develop basic data needed to formalize and implement a demand/capacity based seismic design methodology that explicitly considers the inelastic response characteristics of structures. The objective is to make the design process transparent and equally applicable to the seismic evaluation of existing structures and seismic designs of new structures, using conventional structural systems as well as new structural systems, materials, and innovative energy dissipation or base isolation systems. The design objective is to provide a structure with sufficient strength, stiffness, and ductility such that the deformation demands imposed by design earthquakes do not exceed the deformation capabilities associated with design limit states (e.g. serviceability, collapse safety). It is intended to achieve a consistent level of seismic protection for structures of different configurations and structural systems, which may be located in regions of different seismicity. The proposed research is directed towards achieving this goal by focusing on the following objectives: (1) evaluate, refine, modify, and develop (if needed) the basic concepts on which a consistent and transparent seismic design methodology can be based; (2) develop a comprehensive set of information on seismic demand parameters for inelastic SDOF systems, which will form the basis for the design of MDOF structures; (3) develop the knowledge needed to modify the SDOF demand parameters in a manner that accounts for multi-mode effects present in real MDOF structures; (4) investigate the effects of ground motion characteristics for expected cumulative damage effects; and (5) formalize and test the proposed seismic design methodology in order to make it useful for the engineering profession. The information on demands and capacities created in the project will have an impact on the state of knowledge and will facilitate and accelerate the adoption of more realistic and transparent design procedures. ***