Find the most up-to-date version of AISI S at Engineering 2 to the North American Specification for the Design of Cold-Formed Steel Structural Members, Edition February ; AISI S/S ()AISI . Cold-Formed Steel─Special Bolted Moment Frame (CFS─SBMF) system in the proposed AISI Seismic Standard (AISI S) are developed.
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Future editions are expected to expand on analysis methods and their implementation for cold-formed steel SFRS. This chapter outlines requirements for Diaphragms.
Specifically, the available strength of the SFRS must be greater than or equal to the required strength determined from the applicable load combinations to ensure adequate performance in a design-level seismic-event. The nominal shear strength, V ncan be determined:.
Type II shear walls Figure 2b permit openings in the wall s1110 specific design for force transfer around the openings.
STRUCTURE magazine | AISI S/S
Seismic energy is dissipated through sliding and bearing deformations in the wisi connections between the beams and columns. If an opening exists, details must be provided for load transfer around the opening. Your message Submit Comment. Cold-formed steel special bolted moment frame. This chapter, Analysisprescribes that the structural analysis should be done in accordance with the applicable building code and AISI S Expected strength is used to estimate the maximum forces the SFRS is anticipated to resist prior to dissipating energy through yielding.
The expected strength of the SFRS can be derived by simple mechanics based on the strap expected strength. The modification coefficient for strength increase due to cold work of forming is determined as: The shear wall strength is determined by the nominal strength of the strap as follows:. Type I shear walls Figure 2 a are fully sheathed and require hold-downs and anchorage at each end aksi the shear wall. This system is formed by cold-formed channel beams and HSS columns with bolted moment connections, as detailed in Figure 3.
Unique to cold-formed steel, an additional yield stress increase must be considered due to the cold work of forming and inelastic reserve capacity:.
Aug, By Rob Madsen P. Sheathed shear wall analysis models. Chapter D This chapter, General Member and Connection Design Requirementsreferences Chapters E and F aaisi specific member and connection design and is reserved for future development. The designated energy dissipating mechanism and methods for determining the expected strength of the various SFRS are included in Chapter E, as discussed below.
Determine the nominal shear strength of the strap braced wall, as illustrated in Figure 4a iasi, and the expected strength of the system. This is intended to dovetail with ASCE Chapter 12, which provides general guidance on this topic.
Chapter B This chapter, General Design Requirementsoutlines fundamental seismic design requirements. Chapter C This chapter, Analysisprescribes that the structural analysis should be done in accordance with the applicable building code and AISI S Seismic energy is dissipated in wood structural panel shear walls through titling and bearing deformation in the screw connections between the wood structural panel sheathing and the cold-formed steel structural members, and in the wood structural panels themselves.
Leave a Comment Click here to cancel reply. This chapter, Use of Substitute Components and Connections in Seismic Force-Resisting Systemspermits the substitution of components or connections in any s11 the SFRS specified in Chapter E as long as they follow the applicable building code requirements and are approved by the authority having jurisdiction.
The nominal shear strength and detailed requirements are provided in Section E6 of the standard.
The zisi shear strength per unit length, v nis based on the values for Type I shear walls and C a is tabulated in the xisi for a variety of shear wall geometries. Shear wall sheathed with wood structural panels. The nominal shear strength, V ncan be determined using the same equations provided in Section a except that values for v n and C a are tabulated separately in the standard.
Chapter A, Scope and Applicability Aisj standard focuses on the design and construction of cold-formed steel members and connections in seismic-force-resisting systems SFRS and diaphragms in buildings and other structures.
To ensure the shear wall performs as intended, additional system requirements must be met as further detailed in AISI S, Section E2.
This chapter, General Design Requirementsoutlines fundamental seismic design requirements. To perform as intended in a design level seismic event, this common SFRS must be designed and detailed asi ensure that the diagonal tension strap yields first, thus dissipating the seismic energy, while other limit states such as fracture at the strap ends and buckling of the chord studs are avoided.
Seismic energy is dissipated through the connections between the steel sheet and the cold-formed steel structural members. In e110 absence of an applicable building code, the design requirements must follow accepted engineering practice for the location under consideration, as specified by ASCE This first edition of AISI S represents a merging of the following previously published standards: The expected strength of steel-sheet sheathed shear walls is specified as 1.