强震持时效应对中心支撑钢框架抗震性能的影响及对策研究

Duration is an important characteristic of earthquake ground motions, which affects the cumulative damage in a structure during an earthquake event. However, such a factor has never been explicitly considered in seismic design and performance evaluation for building structures. Recent earthquakes in China, Japan, Chile, and other countries have demonstrated the catastrophic feature of long-duration earthquakes. There is an urgent need to thoroughly and systematically investigate the influence of strong motion duration on seismic performance of building structures. This research focuses on Steel Concentrically Braced Frames (SCBFs), a system suiting the future needs of construction industry in China. Through extensive theoretical analyses, computer simulations, and laboratory tests, this research intends to establish a scientific method for evaluating the effect of ground motion duration; investigate the behavior and failure mechanism of SCBFs under the ground motions with different durations; generate knowledge for achievement of expected performance and damage control; improve the current seismic design and analyses of SCBFs; and develop efficient, economical, practical and reliable techniques for rehabilitating SCBFs before and after earthquakes. The proposed research not only has a scientific value in the field of earthquake engineering but also provides a theoretical and technological basis for promoting the use of SCBFs in our country. The expected outcome of this research will enhance seismic performance and resilience of the mid-rise and high-rise steel building structures while reducing their life-cycle costs, which offers long-term social and economical benefits.

持时是地震动的一个重要参数，影响结构在地震中的累积损伤。然而，这一因素却被国内外的结构抗震设计和性能评估长期忽视。在我国、日本和智利等国近期发生的地震已证实长持时地震的严重危害。因此，系统研究强震持时对建筑结构抗震性能的影响已迫在眉睫。本项目以适应我国建筑工业化发展趋势的中心支撑钢框架为切入点，结合理论分析、数值仿真和结构试验等手段；着力建立对强震持时效应分析和评价的科学方法；揭示中心支撑钢框架在各类持时强震作用下的破坏机理；为该体系建立性态和损伤控制准则；完善和改进抗震分析与设计理论；并为其建立快速、经济、可靠的震前和震后加固方案。预期成果不仅对地震工程领域有基础性的科学意义；而且为中心支撑钢框架在我国的推广应用提供理论基础和技术积累。相关成果的应用将有助于提高我国多高层钢结构的抗震性能和震后恢复能力，达到降低建筑结构全寿命周期成本的目的，具有深远的社会效益。

持时是地震动的一个重要参数，影响结构在地震中的累积损伤。然而，这一因素却被国内外的结构抗震设计和性能评估长期忽视。系统研究强震持时对建筑结构抗震性能的影响已迫在眉睫。本项目以适应我国建筑工业化发展趋势的中心支撑钢框架为切入点，结合理论分析、数值仿真和结构试验等手段；着力建立对强震持时效应分析和评价的科学方法；揭示中心支撑钢框架在各类持时强震作用下的破坏机理；为该体系建立性态和损伤控制准则；完善和改进抗震分析与设计理论；并为其建立快速、经济、可靠的震前和震后加固方案；论述了不同类型的高性能支撑对中心支撑钢框架抗震性能的影响；建立了附属于柔性中心支撑钢框架的非结构构件的抗震设计方法；研发了适用于中心支撑钢框架的组合梁、内墙和外墙等体系。预期成果不仅对地震工程领域有基础性的科学意义；而且为中心支撑钢框架在我国的推广应用提供理论基础和技术积累。相关成果的应用将有助于提高我国多高层钢结构的抗震性能和震后恢复能力，达到降低建筑结构全寿命周期成本的目的，具有深远的社会效益。