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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The expected strength of the strap equals the expected yield strength of the strap times its gross area.

The nominal shear strength per e110 length, v nis based on the values for Aiei I shear walls and C a is tabulated in the standard for a variety of shear wall geometries. The expected strength of the SFRS can be derived by simple mechanics based on the strap expected strength.

For instance, it is limited to single story structures no higher than 35 feet. Chapter C This chapter, Analysisprescribes that the structural analysis should be done in accordance with the applicable building code and AISI S This is intended to dovetail with ASCE Chapter 12, which provides general guidance on this topic.

Future editions may be extended to include other common diaphragm systems. 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. For instance, provisions must be made a110 guard against loose strap bracing z110 by pre-tensioning the straps or through other similar methods of installing the tension-only strap bracing.

AISI to Develop New Unified Cold-Formed Steel Seismic Design Standard

First Name Last Name. Braced shear wall design example.


Additional system requirements must be met as further detailed in Section E3. The beams and columns, therefore, need to be designed to resist the expected moment M e and shear V e at the bolted connections defined as:. Yielding also occurs in the tension fields across the steel sheet. This chapter, Analysisprescribes that the structural analysis should be done in accordance with the applicable building code and AISI S This chapter, General Member and Connection Design Requirements s110, references Chapters E and F for specific member and connection design and is reserved ss110 future development.

Chapter B This chapter, General Design Requirementsoutlines fundamental seismic design requirements. This consolidated seismic design standard brings together all North American cold-formed steel seismic-force-resisting systems SFRS into one standard, adding a consistent capacity-based design philosophy to each. Aug, By Rob Madsen P. To ensure the shear wall performs as intended, additional system requirements must be met as further detailed in AISI S, Section E1.

AISI to Develop New Unified Cold-Formed Steel Seismic Design Standard

Shear wall sheathed with wood structural panels. The standard also provides Canadian seismic design provisions where the d110 force modification factors, R d R oare taken as greater than or equal to 1. Chapter A also provides the provisions for determining the material expected strength for steel.

Determine the nominal shear strength of the strap braced wall, as illustrated in Figure 4aand the expected strength of the system. The expected strength of this SFRS equals 1. This first edition of AISI S represents a merging of the following previously published standards: A design guide for the seismic design of cold-formed steel framing will be published in Expected strength is used to estimate the maximum forces the SFRS is anticipated to resist prior to dissipating energy through yielding.


Section 2210 Cold-Formed Steel

Detailed guidance on how to determine the a110 strength is provided in the standard. To perform as intended in a design level seismic event, this common SFRS must be designed and detailed to ensure that the diagonal tension strap yields first, thus dissipating the seismic energy, while other limit states aissi as fracture at the strap ends and buckling of the chord studs are avoided.

This chapter, Use of Substitute Components and Connections in Seismic Force-Resisting Systemspermits the substitution of components or connections in any of the SFRS specified in Chapter E as long as they follow the applicable building code requirements and are approved by the authority having jurisdiction.

Leave a Comment Click here to cancel reply. Your message Submit Comment. Sheathed shear aiisi analysis models. The shear wall strength is determined by the nominal strength of the strap as follows:.

Safety and resistance factors: This standard currently provides the design ss110 for cold-formed steel-framed diaphragms sheathed with wood structural panels. Seismic energy is dissipated through sliding and bearing deformations in the bolted connections between the beams and columns.

The expected strength of the SFRS, capped by the seismic load effects including overstrength, is to be used to design other components in the SFRS that are not part of the designated energy-dissipating mechanism, including any collectors.

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