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Posted by MSC on October 13, 2008 at 4:05 PM.

The following papers appear in the fourth quarter 2008 issue of AISC’s Engineering Journal. EJ is available online (free to AISC members) at www.


Cyclic Behavior and Seismic Design of Bolted Flange Plate Steel Moment Connections




The AISC Connection Prequalification Review Panel (CPRP) is currently reviewing the bolted flange plate moment connection for inclusion in the next edition of the AISC Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications. To expand the experimental database for prequalifying the bolted flange plate (BFP) moment connection for special moment frames, cyclic testing of three full-scale BFP steel moment connection specimens has been conducted. Beam sizes for these specimens (W30×108, W30×148, and W36×50) were larger than previously tested to extend the range of available experimental results. All three specimens performed well and met the Acceptance Criteria of the AISC Seismic Provisions. The specimens achieved an interstory drift angle of 0.06 radians before failure.

Topics: Connections-Moment, Seismic Design, Lateral Systems


Simplified LRFD Design of Steel Members for Fire


Tai-Kuang Lee, Austin D.E. Pan, and Ken Hwa


This paper proposes a simplified design methodology for steel members under fire in accordance with LRFD provisions. The fire design criterion compares the required design strength ratio with the design strength reduction ratio. Design strength ratios are derived from the required strength factor and the overstrength factor. Simplified formulas for member strength at elevated temperatures, as well as their corresponding critical temperatures, are derived for steel members under tension, compression and flexure, for unrestrained boundary conditions. An illustrative example is presented and comparisons are made with experimental data.

Topics:  Fire and Temperature Effects, Tension Members, Columns and Compression Members, Beams and Flexural Members


Quantifying and Enhancing the Robustness in Steel Structures:

Part 1 – Moment-Resisting Frames






Quantifying and Enhancing the Robustness in Steel Structures:

Part 2 – Floor Framing Systems




The objective of this two-part manuscript is to provide information that can lead to: (a) better understanding of disproportionate collapse in structural steel framing systems; (b) improved understanding of secondary load paths that form within structural steel framing systems in the event of a localized failure; (c) development of minimum general structural integrity provisions for structural steel framing systems analogous to those present in ACI 318; (d) recommendations for minimum tie forces that can be used as the basis of indirect design methodologies for structural steel framing systems; (e) an understanding of the distribution of tensile forces within typical steel floor framing systems to facilitate compartmentalization damage or collapse; and (f) identification of simple and economical means with which to enhance the robustness in the typical structural steel framing system.

Topics:  Blast, Physical Security and Progressive Collapse, Lateral Systems



Current Steel Structures Research


Reidar Bjorhovde


This regular feature of the Engineering Journal provides information on new and ongoing research around the world.  In the 16th installment, research projects are summarized on the following topics:  Behavior and Strength of Link-to-Column Connections in Eccentrically Braced Frames (University of Texas-Austin), Use of Cast Steel Connectors for Bracing Connections in Special Concentrically Braced Frames (University of Toronto), Minimizing the Strength of Bracing Connections (Canam Corp.), Block Shear Evaluation for Members with Uncommon Failure Paths (University of Alberta), Testing of Shear Lugs for Column Bases (Technical University Federico Santa Maria, Valparaíso, Chile), Punching Shear Resistance of Tension Bolts (University of Thessaloniki in Greece and University of Pécs in Hungary), Three-Dimensional Web-Based Semi-Rigid Steel Frame Analysis with Graphical Interface (University of Texas at Arlington), Monitoring of Crane Girders in Actual Structures (University of the Witwatersrand in Johannesburg, South Africa), and Cold-Formed Stainless Steel HSS (University of Hong Kong).

Topics:  Research

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