CAREER: Performance-Based Design of Earthquake Resisting Structural Systems

9733959 Bracci1997年拟议的NEHRP(国家减少地震灾害计划)关于新建筑和其他结构的地震法规的规定(BSSSC-1997)在试图在设计过程中确定结构在地震中的性能水平方面有了显著的改进。性能水平是以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裕度。考虑了三个性能级别，包括立即入住率、生命安全和防止坍塌。尽管这些准则代表着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。该职业发展计划的目标是：(A)根据1997年NEHRP建议《新建筑及其他结构抗震规程》的规定，评估和比较各种抗侧向力结构体系的设计；(B)使用非线性时程动力分析来评估和比较它们在不同水平地震激励下的基于性能的反应；以及(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个短期课程，该课程将重点放在基于性能的抗震结构体系设计上。该项目的影响将通过提供由于不同强度的地震而导致的几种类型结构系统的不同性能水平的发生概率来认识。因此，给定结构体系在不同烈度地震作用下的基于性能的设计目标，可以选择抗侧向载荷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体系，可以确定在不同地震烈度下的预期性能水平，并可以确定是否需要进行抗震加固。

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.