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

当加拿大设计工业、商业和住宅建筑以抵抗地震荷载时，经常使用两种结构框架：钢多层支撑框架和钢抗弯矩框架。多层支撑框架有两个或更多的支撑板堆叠在地面和屋顶之间。抗弯矩框架是由梁和柱紧密结合而成的。对这两种系统性能的研究导致了抗震设计指南和钢设计标准的调整。然而，最近的分析和实验研究发现了一些不受欢迎的失败，这些失败尚未得到充分理解。此外，在目前的钢铁设计标准中，有些缺陷没有得到适当的解决。****对于受地震荷载作用的多层支撑框架，最近提出了特殊的设计要求，以改善框架的性能。然而，框架稳定性可能会受到框架柱伴随的面外弯矩的影响；这一点必须反映在设计中。还必须制定反映框架在地震荷载下的实际行为并降低建筑成本的替代设计策略，以获得更好的稳定性响应。****对于地震荷载作用下的抗弯矩框架，受弯屈服和局部屈曲可能导致柱失稳。通过理解综合效应，我们可以制定出反映相互作用的合适的抗震设计标准。****我的长期研究计划旨在开发新的系统和设计方法，以最大限度地降低建筑成本，提高加拿大钢结构的地震反应和安全性。本研究计划的总体目标是制定钢多层支撑框架和抗弯矩框架的抗震设计准则，以防止柱失稳。****本研究项目的具体目标是：****1)发展面内面外耦合地震要求下多层支撑框架柱的设计方法****2)发展通过选择支撑构件来控制多层支撑框架面内地震行为的特殊分析和设计方法****3)建立深部主要侧向稳定极限状态的强度和稳定性要求；地震荷载作用下的细长抗弯矩框架柱。****我们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材设计标准制定抗震设计建议。此外，我们将为从业者提供改进的分析和设计工具，这些工具可以应用于日常实践

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.***