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Posted by MSC on September 5, 2008 at 10:03 AM.
Third Quarter 2008 Article Abstracts The following papers appear in the third quarter 2008 issue of AISC’s Engineering Journal. EJ is available online to AISC members and ePubs subscribers at http://www.aisc.org/epubs.
Fracture Modeling of Rectangular Hollow Section Steel Braces
Xiang Ding, Douglas Foutch, and Sang-Whan Han
Steel braced frames are widely used in all regions of the U.S. including those with high levels of seismicity. Rectangular hollow sections (RHS) are popular because of good section properties and ease of construction. A refined beam model has been developed which is efficient for use in finite element models of buildings. It accounts for local buckling and fracture in the brace and is shown to have good accuracy for nonlinear seismic analyses.
Topics: Seismic Design, Hollow Structural Sections, Stability and Bracing
Design Aid for Triangular Bracket Plates Using AISC Specifications
Shilak Shakya and Sriramulu Vinnakota
This paper presents a model to determine the nominal strength of a triangular steel bracket plate using the column strength equations in AISC Specification. Also included are two design tables for such bracket plates for two grades of steel. The nominal strengths obtained by using the relations developed by the authors are compared with the available experimental results and results from other available theoretical approaches. The authors’ approach predicts results closer to the experimental results than the other theoretical approaches. Two example problems are worked to illustrate the use of the design tables.
Topics: Connections-Simple Shear, Columns and Compression Members, Steel
A Comparison of Frame Stability Analysis Methods in ANSI/AISC 360-05
Charles J. Carter and Louis F. Geschwindner
Two simple unbraced frames are used to illustrate the application of the following four frame stability analysis methods:
1. The Second-Order Analysis Method (ANSI/AISC 360-05, Section C2.2a)
2. The First-Order Analysis Method (ANSI/AISC 360-05, Section C2.2b)
3. The Direct Analysis Method (ANSI/AISC 360-05, Appendix 7)
4. The Simplified Method (13th Ed. Steel Construction Manual page 2-12; AISC Basic Design Values cards)
Topics: Analysis, Specifications, Stability and Bracing
Effects of Slab Post-Tensioning on Supporting Steel Beams in Steel Framed Parking Deck Structures
Bhavna Sharma and Kent A. Harries
AISC Design Guide 18, Steel Framed Open-Deck Parking Deck Structures, discusses the use of cast-in-place post tensioned concrete slabs in steel framed parking structures. In Section 22.214.171.124 of Design Guide 18, the authors reflect on the manner in which the post-tensioning force is resisted by and affects the supporting beam: in a non-composite or composite manner. They conclude that the post-tensioning force is carried almost entirely in a composite manner (minus effects of shrinkage and elastic shortening). This conclusion is based on results of unpublished research and is corroborated by earlier design guidance. The objective of this field study is to quantitatively assess the effect that slab post-tensioning forces have on their supporting steel members.
Keywords: Beams and Flexural Members, composite construction
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