Abstract
This paper presents the outcome of a study of two-span glass fiber reinforced polymer (GFRP) I-section beams susceptible to lateral-torsional buckling when subjected to gradually increasing concentrated vertical load(s) in the presence of two different types of lateral bracing schemes. It is found that loading one span results in a smaller buckling load as compared with the cases with loading in both spans regardless of the type of bracing scheme used. Also, the study shows that the addition of midspan braces for the GFRP beams results in up to 5.5 times increase in the buckling load capacity.
Highlights
Supports and at the middle of each span
Pultruded glass fiber reinforced polymer (GFRP) I-section beams are often susceptible to lateral-torsional buckling when subjected to gradually increasing flexural loads about the cross-sectional major axis
The present paper summarizes the outcome of an investigation of a two-span GFRP I-section beam with two different types of bracing systems
Summary
Pultruded glass fiber reinforced polymer (GFRP) I-section beams are often susceptible to lateral-torsional buckling when subjected to gradually increasing flexural loads about the cross-sectional major axis. The authors have previously published studies on lateral-torsional buckling behavior of laterally unbraced single-span GFRP beams [1], [4], [6]. In [3], the authors presented a practical solution for avoiding lateral-torsional buckling of single-span I-section beams by addition of lateral bracing. Amponin and Razzaq [5] presented a theoretical and experimental study of a threespan FRP beam under a gradually increasing concentrated load at the center of the middle span. Qiao et al [7] presented a lateral-torsional buckling study of GFRP I-beams including sectional distortions. The present paper summarizes the outcome of an investigation of a two-span GFRP I-section beam with two different types of bracing systems. The effectiveness of the bracing systems is studied for two different types of loading conditions
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