Static Resistance of Open Web Steel Joist Roof Trusses for Blast Response Analysis
Publication: Journal of Performance of Constructed Facilities
Volume 31, Issue 6
Abstract
Open web steel joists (OWSJs) are prefabricated lightweight roof structure components that are designed for conventional loads in accordance with current standards and specifications. The resistance function currently used to design joists against blast loading is linearly elastic and perfectly plastic after the elastic deflection limit, which does not account for the different failure mechanisms of the joist components and system. For blast analysis and design of such roof trusses, further investigation of the behavior of these joists is needed. This paper presents numerical modeling and experimental evaluation of three different steel joist systems to failure to develop an accurate representation of the static resistance and energy absorption capabilities of OWSJ roof trusses to failure. Experimental results were used to verify robust explicit numerical models for predicting the static resistance function of OWSJ roof trusses. A deformable weld behavior was used to simulate all spot welds connecting web members to the joist top and bottom chords. Additionally, a criterion that predicts the failure of the end connection bearing seat of the joist system was included in the numerical simulation. The results of the numerical modeling and the experimental evaluation demonstrate the inadequacy of the current resistance models used for blast analysis purposes based on energy comparisons using various damage levels.
Get full access to this article
View all available purchase options and get full access to this article.
References
ABAQUS version 6.11 [Computer software]. Dassault Systemes, Providence, RI.
Avci, O., and Murray, T. (2012). “Effect of bottom chord extensions on the static flexural stiffness of open-web steel joists.” J. Perform. Constr. Facil., 620–632.
Baylot, J., Bogosian, D., Dunn, B., and Simmons, L. (2000). “Retrofits for steel joist roofs exposed to blast loads.” Proc., Structures Congress 2000—Advanced Technology in Structural Engineering, ASCE, Reston, VA, 1–8.
Biggs, J. M. (1964). Introduction to structural dynamics, McGraw-Hill, New York.
Broekemeier, M. W., and Fisher, J. M. (2007). “Evaluation and modification of open-web steel joists and joist girders.” Proc., North American Steel Construction Conf., Curran Associates, Red Hook, NY.
Buckley, E. T., Dinehart, D. W., Green, P. S., Gross, S. P., and Yost, J. R. (2008). “Experimental study of open web steel joists with crimped critical web members.” Proc., SSRC Annual Stability Conf., Structural Stability Research Council, Chicago.
Fisher, J. M. (2005). “Strengthening open-web steel joists.” Eng. J., 42(4), 247–260.
Geringer, J., Tuan, C., and Lindsey, P. (2013). “Assessment of software for blast loading and structural response analysis using a lightweight steel-joist roof as a test case.” J. Perform. Constr. Facil., 144–154.
McClendon, M. A. (2007). “Blast resistant design for roof systems.” M.S. thesis, Univ. of Missouri, Columbia, MO.
PDC (Protective Design Center). (2008). “Single degree of freedom structural response limits for antiterrorism design.”, U.S. Army Corps of Engineers, Washington, DC.
SJI (Steel Joist Institute). (2010). Standard specifications load tables and weight tables for steel joists and joist girders, 43rd Ed., Myrtle Beach, SC.
STAAD [Computer software]. Bentley Systems, Yorba Linda, CA.
UFC (Unified Facilities Criteria). (2008). “Structures to resist the effects of accidental explosions.”, U.S. Dept. of Defense, Washington, DC.
Yost, J., Dinehart, D., Gross, S., Pote, J., and Gargan, B. (2004). “Strength and design of open web steel joists with crimped-end web members.” J. Struct. Eng., 715–724.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 31 • Issue 6 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 12, 2016
Accepted: May 25, 2017
Published online: Sep 25, 2017
Published in print: Dec 1, 2017
Discussion open until: Feb 25, 2018
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.