CAREER: Performance-Based Design of Earthquake Resisting Structural Systems

职业：基于性能的抗震结构系统设计

• 批准号: 9733959
• 负责人: Joseph Bracci
• 金额: $ 20万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9733959&HistoricalAwards=false
• 关键词: CAREER; Performance; Based; Design; Earthquake

9733959 BracciThe proposed 1997 NEHRP (National Earthquake Hazard Reduction Program) Provisions for seismic regulations of new buildings and other structures (BSSSC-1997), show marked improvement in trying to define, in the design process, the performance levels of structures during earthquakes. Performance levels are expressed in terms of allowable damage to structural and non-structural components, with the intention of providing definite margins of safety. Three performance levels are considered, including Immediate Occupancy, Life Safety, and Collapse Prevention. Although the guidelines represent a significant advance in the practice of seismic engineering, calibration of the analysis procedures and acceptance criteria for actual building performance is clearly needed. The objectives of this CAREER Development Program are to: (a) Evaluate and compare the design of various lateral force resisting structural systems according to the proposed 1997 NEHRP Recommend Provisions for Seismic Regulations for New Buildings & Other Structures; (b) Evaluate and compare their performance-based response during various levels of seismic excitation using nonlinear time history dynamic analyses; and (c) enhance an existing graduate course in Civil Engineering at Texas A&M and develop a short-course for students, researchers, and practicing engineers from the United States and Mexico which will emphasize performance- based design of seismic force resisting structural systems. The impact of the project will be recognized by providing probabilities of occurrence for various performance levels of several types of structural systems due to earthquakes of varying intensities. Therefore, given performance based- design objectives for a structural systems during earthquakes of varying intensities, the lateral load resisting mechanism can be selected for optimal performance. In addition, given an existing structural system designed according to previous building codes, the ex pected performance level under various earthquake intensities can be identified and the need for seismic retrofit can be determined.

1997年提出的《新建筑和其他结构抗震管理规定》（BSSSC-1997）在设计过程中对结构在地震中的性能水平进行了界定，这方面有了明显的改进。性能水平是用结构和非结构部件的允许损坏来表示的，目的是提供明确的安全边际。考虑了三个性能级别，包括立即占用，生命安全和防止倒塌。虽然该指南代表了地震工程实践的重大进步，但显然需要对实际建筑性能的分析程序和验收标准进行校准。本职业发展计划的目标是：(a)根据拟议的1997年NEHRP新建筑和其他结构抗震法规建议规定，评估和比较各种抗侧力结构体系的设计；(b)利用非线性时程动力分析评价和比较它们在不同地震激励水平下基于性能的反应；(c)加强德克萨斯农工大学现有的土木工程研究生课程，并为来自美国和墨西哥的学生、研究人员和执业工程师开发一门短期课程，该课程将强调基于性能的抗震结构系统设计。该项目的影响将通过提供几种类型的结构系统的不同性能水平由于不同强度的地震而发生的概率来识别。因此，给定结构体系在不同烈度地震作用下的性能设计目标，可以选择抗侧载机制以获得最佳性能。此外，根据以前的建筑规范设计的现有结构系统，可以确定在各种地震烈度下的预期性能水平，并确定抗震改造的需要。