Advanced seismic force resisting systems for cold-formed steel framed building structures

先进的冷弯型钢框架建筑结构抗震系统

• 批准号: RGPIN-2019-04782
• 负责人: Rogers, Colin
• 金额: $ 2.62万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=737856
• 关键词: Advanced; seismic; force; resisting; systems

Cold-formed steel (CFS) framed buildings are complex systems that under earthquake ground motion excitation experience the most severe demands of their life cycle. The current CFS lateral systems described in AISI S400 are intended for use in 1 to 3 storey buildings. Given the continually increasing population in urban centres, there exists a need to develop taller & larger buildings to better optimize land use in our cities; that is, CFS framed mid-rise buildings extending up to 8 storeys in height. The force and deformation demands placed on such buildings in a design level earthquake require the development of a lateral framing system that improves upon the capability of existing CFS systems. Preliminary studies at McGill have demonstrated the potential of a centre-sheathed framing system constructed of CFS members & panels to carry shear loads far in excess of what is possible using designs from AISI S400, with substantially improved ductility.   The objectives of the 5 year research program are: (i) Develop a CFS centre-sheathed shear wall system for use in mid-rise building construction, (ii) Expand on the CFS lateral seismic systems (R-values & height limits) listed in the NBCC, and (iii) Provide guidelines covering the design & construction of these systems for inclusion in the AISI design standards.   Methodology: Characterize through laboratory testing the response of framing / sheathing connections, frame action, response of chord members to combined loading, and the impact of non-structural components on shear resistance and stiffness. Complete a FE based parametric study of the shear walls and their chord stud configurations to broaden the database of characterization information. Establish an analytical design method for the centre-sheathed walls. Institute dynamic analyses of buildings using OpenSees models, capable of representing the high strength & ductility of the shear walls, the flexibility of the diaphragms, the added strength & stiffness of the non-structural components & bearing walls & the non-linear response of the chord studs, to verify the analytical design approach and to quantify the contribution of all wall components. Develop a design method for overturning / uplift and propose seismic R-values through dynamic analyses of building models for various locations and applicable suites of scaled ground motions. Use fragility curves to quantify the probability of failure. HQP: 1 PhD, 4 Master's, 5 Ugrad students & lab technicians.   This innovative research will advance the discipline of CFS framed mid-rise building seismic design. Codes & standards will be updated for the seismic design and analysis of CFS framed structures. The likelihood of collapse of CFS framed structures during a seismic event will be improved, as will the safety of building owners & occupants. Academic research programs beyond Canada will have access to these research findings that can be incorporated in comparable design guides worldwide.

冷弯型钢 (CFS) 框架建筑是复杂的系统，在地震地面运动激励下会经历其生命周期中最严格的要求。 AISI S400 中描述的当前 CFS 横向系统适用于 1 至 3 层建筑。城市中心的人口不断增加，需要开发更高更大的建筑，以更好地优化城市的土地利用；即，CFS 框架中层建筑的高度可达 8 层。麦吉尔大学的初步研究表明，由 CFS 构件和面板构成的中心护套框架系统具有抗震设计的潜力，需要开发横向框架系统，以提高现有 CFS 系统的能力。承受的剪力载荷远远超过使用 AISI S400 设计所能承受的剪力载荷，并且延展性显着提高。 5 年研究计划的目标是： (i) 开发 CFS 中心护套剪力墙系统。用于中层建筑施工，(ii) 扩展 NBCC 中列出的 CFS 横向地震系统（R 值和高度限制），以及 (iii) 提供涵盖这些系统的设计和施工的指南以供纳入AISI 设计标准中的方法：通过实验室测试表征框架/护套连接的响应、框架作用、弦杆构件对组合载荷的响应以及非结构部件对抗剪力和刚度的影响。参数研究剪力墙及其弦柱配置，以扩大中心护套墙的分析设计方法，使用 OpenSees 模型对建筑物进行动态分析，能够代表剪力墙的高强度和延展性。 、隔板的灵活性、非结构部件和承重墙的附加强度和刚度以及弦螺柱的非线性响应，以验证分析设计方法并量化所有墙部件的贡献。倾覆/隆起的设计方法，并通过对不同位置的建筑模型和适用的缩放地面运动套件进行动态分析来提出地震 R 值。使用脆性曲线来量化失败的概率：1 个博士，4 个硕士， 5 大学学生和实验室技术人员​这项创新研究将推动 CFS 框架中层建筑抗震设计学科的发展。 CFS 框架抗震设计和分析的规范和标准将得到更新。地震事件期间 CFS 框架结构倒塌的可能性将得到改善，加拿大以外的学术研究项目也将能够获得这些研究成果，并将其纳入全球类似的设计指南中。