Development of Innovative Design Methods for Enhanced Seismic Stability of Steel Framed Building Structures

开发增强钢框架建筑结构抗震稳定性的创新设计方法

• 批准号: RGPIN-2017-04013
• 负责人: Imanpour, Ali
• 金额: $ 1.6万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=710644
• 关键词: Development; Innovative; Design; Methods; Enhanced

When industrial, commercial and residential buildings are designed in Canada to resist seismic load, two structural frames are frequently used: steel multi-tiered braced frames and steel moment-resisting frames. Multi-tiered braced frames have two or more bracing panels stacked between the ground and roof levels. Moment-resisting frames are built from beams and columns that are rigidly framed together. Research on behaviour of both systems led to seismic design guidelines and adaptations in steel design standards. However, recent analytical and experimental studies observed several undesirable failures that are not fully understood. Further, some failures are not properly addressed in current steel design standards. For multi-tiered braced frames under earthquake loads induced in the plane of the frame, special design requirements were recently proposed to improve frame behaviour. Still, frame stability may be compromised by concomitant out-of-plane bending moments induced in the frame columns; this must be reflected in design. Alternative design strategies that reflect actual behaviour of the frame under earthquake loads and reduce construction costs must also be developed for better stability response. For moment-resisting frames under earthquake loads, flexural yielding and local buckling may cause instability of columns. By understanding combined effects, we can develop suitable earthquake-resistant design criteria that reflect interactions. My long-term research program aims to develop novel systems and design methods that improve seismic response and safety of steel structures in Canada, with minimized construction costs. This research program's general objective is to develop seismic design guidelines for steel multi-tiered braced frames and moment-resisting frames in order to prevent column instability. The specific objectives of this research program are to: 1) develop design methods for columns of multi-tiered braced frames under coupled in-plane and out-of-plane seismic demands 2) develop special analysis and design methods to control in-plane seismic behaviour of multi-tiered braced frames by selection of bracing members 3) establish strength and stability requirements for dominant lateral stability limit states of deep, slender moment-resisting frame columns under seismic load effects. Our methods for each objective include theoretical modeling, experiments and structural analysis knowledge. We will develop seismic design recommendations for the next Canadian steel design standard. Furthermore, we will provide practitioners with improved analysis and design tools that can be applied in day-to-day practice.

当加拿大设计工业，商业和住宅建筑以抵抗地震载荷时，经常使用两个结构性框架：钢制多层支撑框架和抗钢固定框架。多层支撑框架在地面和屋顶之间堆叠了两个或多个支撑面板。抗矩框架是由横梁和圆柱构造的，这些框架被牢固地框起来。两种系统行为的研究导致了地震设计指南和钢设计标准的改编。然而，最近的分析和实验研究观察到了几个尚未完全理解的不良故障。此外，在当前的钢设计标准中未正确解决一些故障。 对于在框架平面引起的地震载荷下的多层支撑框架，最近提出了特殊的设计要求以改善框架行为。尽管如此，框架稳定性可能会因框架柱中引起的平面外弯曲力矩而损害。这必须反映在设计中。还必须制定反映地震负载下框架实际行为并降低建筑成本的替代设计策略，以改善稳定性响应。 对于地震负荷下的抗矩框架，弯曲屈服和局部屈曲可能会导致柱的不稳定。通过理解综合效应，我们可以开发出适当的抗震设计标准来反映相互作用。 我的长期研究计划旨在开发新颖的系统和设计方法，以最小化的建筑成本来改善加拿大钢结构的地震反应和安全性。该研究计划的一般目标是为钢制多层支撑框架和抗矩框架制定地震设计指南，以防止柱不稳定。 该研究计划的具体目标是： 1）开发设计方法，用于在平面内和平面外地震需求下的多层支撑框架的列 2）开发特殊分析和设计方法，通过选择支撑构件来控制多层支撑框架的面内地震行为 3）在地震载荷效应下，建立强度和稳定性要求，对横向稳定性限制的主要横向稳定性极限状态。 我们针对每个目标的方法包括理论建模，实验和结构分析知识。我们将为下一个加拿大钢铁设计标准制定地震设计建议。此外，我们将为从业者提供改进的分析和设计工具，可以在日常实践中应用。