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

加拿大在设计工业、商业和住宅建筑抗震荷载时，经常使用两种结构框架：钢多层支撑框架和钢抗弯框架。多层支撑框架有两个或多个堆叠在地面和屋顶之间的支撑板。抗力矩框架由刚性框架在一起的梁和柱构成。对这两个系统行为的研究导致了抗震设计指南和钢结构设计标准的调整。然而，最近的分析和实验研究发现了一些尚未完全理解的不良故障。此外，当前的钢设计标准没有正确解决一些故障。****对于在框架平面内引起的地震荷载作用下的多层支撑框架，最近提出了特殊的设计要求，以改善框架的性能。尽管如此，框架柱中随之产生的平面外弯矩可能会损害框架的稳定性；这必须体现在设计中。还必须制定反映框架在地震荷载下的实际行为并降低施工成本的替代设计策略，以获得更好的稳定性响应。****对于地震荷载下的抗弯框架，弯曲屈服和局部屈曲可能会导致柱的不稳定。通过了解综合效应，我们可以制定反映相互作用的合适抗震设计标准。****我的长期研究计划旨在开发新颖的系统和设计方法，以最大限度地降低建筑成本，提高加拿大钢结构的地震响应和安全性。本研究项目的总体目标是制定钢制多层支撑框架和抗弯框架的抗震设计指南，以防止柱失稳。****本研究项目的具体目标是：****1) 开发平面内和平面外耦合地震需求下多层支撑框架柱的设计方法****2) 开发特殊的分析和设计方法，通过选择支撑构件来控制多层支撑框架的面内抗震性能****3) 确定主要侧向的强度和稳定性要求深细长抗弯框架柱在地震荷载作用下的稳定性极限状态。****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抗震设计建议。此外，我们将为从业者提供可应用于日常实践的改进的分析和设计工具。***

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.***