Advancing lateral design standards for cold-formed steel structures in Canada

拟议的研究旨在改善加拿大的知识和设计规定的状态 冷弯型钢（CFS）抗横向荷载结构。加拿大薄钢板建筑研究所表示需要两个相关的研究项目：1）开发信息，以帮助CFS框架楼板和屋顶隔板的设计和分析，2）开发CFS剪力墙，用钢护套，具有足够的标称阻力用于中高层建筑（最高5层）。第一个项目解决的情况下，工程师面临的地方，他们必须在CFS框架建筑物的横隔板的建筑物分析的总简化。 简化导致效率低下，因为忽略了横隔板和横隔板-墙界面的能量耗散潜力;由于横隔板传递到墙的力近似不准确，并且横隔板本身产生的力没有得到很好的理解;这些导致对完整的3D横向力抵抗系统的不完整理解。模型开发的研究正在进行中;然而，迫切需要隔膜的测试数据，以提高模型的准确性，并促进对隔膜响应的更好理解。本项目的目的是通过实验室测试（包括满负荷测试），提供典型CFS地板和屋顶隔膜响应的特征 vs.变形滞后响应第二个项目涉及全钢剪力墙配置（不可燃），可以承载超过30 kN/m的横向荷载，以弥合CFS和热轧钢横向框架剪力墙系统之间的差距，并扩大目前在相关设计标准（如AISI S400）中列出的现有剪切强度值范围。拟议的研究的总体目标是：（一）确定剪切阻力值CFS框架钢护套剪力墙建造的更厚的框架和护套成员比目前可用于设计，通过改进的条带分析方法和测试方法;（二）确定低和高纵横比墙的框架阻塞的效果;和（三）;建议加拿大的标称抗剪强度值。

The proposed research is directed towards improving the state of knowledge and design provisions in Canada of cold-formed steel (CFS) lateral load resisting structures. The Canadian Sheet Steel Building Institute has expressed the need for two related research projects: 1) to develop information to aid in the design and analysis of CFS framed floor and roof diaphragms, and 2) to develop CFS shear walls, sheathed with steel, with nominal resistances that are adequate for use in mid-rise construction (up to 5 storeys). The 1st project addresses the situation that engineers face where they must make gross simplifications in the building analyses for the diaphragms of CFS framed buildings. Simplifications that lead to inefficiencies, as the energy dissipating potential of the diaphragm & diaphragm-to-wall interface is ignored; inaccuracies as the forces transmitted by the diaphragm to the walls are approximated, and the forces that develop in the diaphragms themselves are not well understood; these lead to an incomplete understanding of the full 3D lateral force resisting system. Research on model development is underway; however, there is immediate need for test data on diaphragms to improve model accuracy and facilitate an improved understanding of diaphragm response. The objective of this project is to provide characterization of typical CFS floor & roof diaphragm response by means of laboratory testing, including full load vs. deformation hysteretic response. The 2nd project involves all-steel shear wall configurations (non-combustible) that can carry lateral loads in excess of 30 kN/m to bridge the gap between CFS and hot-rolled steel lateral framing shear wall systems, and to expand on the existing range of shear strength values currently listed in relevant design standards, e.g. AISI S400. The general objectives of the proposed research are: (i) determine shear resistance values for CFS frame steel sheathed shear walls constructed of thicker framing and sheathing members than currently available for design through an improved strip analysis method and testing approaches; (ii) determine the effect of frame blocking for low and high aspect ratio walls; and (iii); recommend nominal shear resistance values for Canada.