Simplified Lateral-Torsional Buckling Analysis in Special Truss-Reinforced Composite Steel-Concrete Beams

Trentadue, Francesco; Quaranta, Giuseppe; Carlo Marano, Giuseppe; Monti, Giorgio

doi:doi:10.1061/(ASCE)ST.1943-541X.0000390

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Simplified Lateral-Torsional Buckling Analysis in Special Truss-Reinforced Composite Steel-Concrete Beams

J. Struct. Eng. 137, 1419 (2011); http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000390 (9 pages)

Francesco Trentadue¹, Giuseppe Quaranta², Giuseppe Carlo Marano³, and Giorgio Monti⁴

¹Associate Professor, Dept. of Environmental Engineering and Sustainable Development, Technical Univ. of Bari, viale del Turismo 10, 74100 Taranto, Italy. E-mail: f.trentadue@poliba.it
²Postdoctoral Scholar, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, One Shields Ave., Davis, CA 95616 (corresponding author). E-mail: gquaranta@ucdavis.edu
³Assistant Professor, Dept. of Environmental Engineering and Sustainable Development, Technical Univ. of Bari, viale del Turismo 10, 74100 Taranto, Italy. E-mail: g.marano@poliba.it
⁴Full Professor, Dept. of Structural Engineering and Geotechnics, Sapienza Univ. of Rome, via A. Gramsci 53, 00197 Roma, Italy. E-mail: giorgio.monti@uniroma1.it

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(Submitted 25 March 2010; accepted 10 February 2011; posted ahead of print 12 February 2011)

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Abstract

References (14)

Article Objects (11)

The paper addresses the lateral-torsional buckling for a special steel truss structure which is adopted to reinforce a particular class of composite steel-concrete beams. The investigated instability phenomenon deals with a transitory ultimate limit state that may occur when the truss structure is being assembled and is bearing the precast floor system, before the concrete has hardened. During this transitory stage the truss beam works as a steel structure and may exhibit local or global instability phenomena. It provides the reinforcement of the final composite steel-concrete beam once the concrete has hardened. The main result of this paper is an analytical approach for the estimation of the elastic critical moment which is required to calculate the final design lateral-torsional buckling resistance moment in accordance with the technical code in force (the European standard for steel structures is considered in this paper). The simplified analysis this paper presents leads to a closed-form solution for the elastic critical moment, thus providing a simple and rapid tool for the calculation of the lateral-torsional buckling resistance moment. A comparison to a finite element analysis has been performed to demonstrate the correctness of the proposed analytical formulation.

Acknowledgments

This work is partially supported by Regione Puglia PO 2007-2013—Asse I-Linea 1.1-Azione 1.1.2-“Aiuti agli investimenti in Ricerca per le PMI”-Progetto I8KBEB2 “Nuovo sistema costruttivo (MTR) in elementi reticolari misti di acciaio e calcestruzzo per l’ingegneria strutturale”-Metal.Ri snc.

Article Outline

Introduction
1. Generalities about the Lateral-Torsional Buckling
2. Truss-Reinforced Composite Steel-Concrete Beams
3. Goal of the Paper
Design Lateral-Torsional Buckling Resistance Moment
1. Beam Geometry
2. Calculation of the Design Lateral-Torsional Buckling Resistance Moment
Analytical Calculation of the Elastic Critical Moment
1. Kinematic Equations
2. Critical State Condition
3. Primary Torsional Stiffness
4. Secondary Torsional Stiffness
5. Equivalent Inertia of the Upper Bars
Validation
1. Problem Data and Finite-Element Model
2. Comparison
Conclusions

KEYWORDS

ASCE SUBJECT HEADINGS

Buckling, Trusses, Floors, Composite beams, Steel, Concrete

AUTHOR KEYWORDS

Lateral-torsional buckling, Steel truss structure, Precast floor system

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ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000390

PUBLICATION DATA

ISSN

0733-9445 (print)

1943-541X (online)

Publisher

American Society of Civil Engineers

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