Author
Lakshmi Subramanian
Bio: Lakshmi Subramanian is an academic researcher from Georgia Institute of Technology. The author has contributed to research in topics: Flexural strength & Girder. The author has an hindex of 3, co-authored 6 publications receiving 48 citations.
Topics: Flexural strength, Girder, Buckling, Test data, Flange
Papers
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TL;DR: The lateral torsional buckling (LTB) resistance equations of the current AISC and AASHTO Specifications are based on unified design provisions as discussed by the authors, which are a fit to a large body of experimental test data for light to medium weight rolled and welded I-section members.
36 citations
TL;DR: The I-section member lateral torsional buckling (LTB) resistance equations of the unified provisions underlying the current AISC and AASHTO specifications are a fit to a large body of experimental test data as discussed by the authors.
Abstract: The I-section member lateral torsional buckling (LTB) resistance equations of the unified provisions underlying the current AISC and AASHTO specifications are a fit to a large body of experimental test data. It has been observed that finite-element (FE) test simulations commonly predict smaller capacities than the AISC/AASHTO LTB equations, especially in the inelastic LTB region. One reason for this disconnect is the fact that the residual stresses and geometric imperfections are often approximated by conservative nominal values in test simulations. Another reason for the discrepancy is the common lack of consideration of inelastic effective length effects within calibrations to experimental test results. This paper recommends improvements to the current LTB resistance equations to address these shortcomings. The impact of inelastic end restraint in representative beam LTB experimental tests is illustrated through FE test simulations. In addition, extensive test simulation results are presented, b...
11 citations
TL;DR: The lateral torsional buckling (LTB) equations in some current standards are based on unified equations that are a fit to a large body of experimental test data However, these curves tend
Abstract: The lateral torsional buckling (LTB) equations in some current standards are based on unified equations that are a fit to a large body of experimental test data However, these curves tend
7 citations
TL;DR: In this paper, the authors evaluate the contribution of single-web longitudinal stiffeners to the yield limit state flexural resistance of slender-web steel I-girders, often referred to as the plateau resistance for the lateral torsional and flange local buckling limit states.
Abstract: The current AASHTO specification requirements for the web bend-buckling strength-reduction factor (Rb) do not consider the influence of longitudinal stiffeners on the flexural resistance of steel I-girders subsequent to the theoretical bend-buckling of a slender web. This is a deficiency that can have significant impact, especially in regions of continuous-span girders subjected to negative moment. This paper evaluates the contribution of single-web longitudinal stiffeners to the yield limit state flexural resistance of slender-web steel I-girders, often referred to as the plateau resistance for the lateral torsional and flange local buckling limit states. Based on test simulation studies, the authors recommend a cross-section model that captures the response of the postbuckled web for both homogeneous and hybrid girders subjected to uniform moment. The proposed model offers up to 60% improvement relative to the current AASHTO specifications.
6 citations
TL;DR: The non-compact web-slenderness limit in current design specifications is based on an assumed value of the plate buckling coefficient for a web subjected to flexure that is between the value...
Abstract: The noncompact web-slenderness limit in current design specifications is based on an assumed value of the plate buckling coefficient for a web subjected to flexure that is between the value...
5 citations
Cited by
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TL;DR: The lateral torsional buckling (LTB) resistance equations of the current AISC and AASHTO Specifications are based on unified design provisions as discussed by the authors, which are a fit to a large body of experimental test data for light to medium weight rolled and welded I-section members.
36 citations
TL;DR: In this paper, the effect of web distortion in LDB resistance of doubly-symmetric welded I-beams is investigated, using GBTul and ABAQUS softwares, respectively.
34 citations
TL;DR: In this article, a statistical analysis of the residual stresses distribution for welded I section members was performed, using the experimental and numerical results, as well as literature data, and some guidelines for the statistical characterization of residual stresses in welded members were proposed.
34 citations
TL;DR: In this paper, a stiffness reduction method for the lateral-torsional buckling assessment of welded web-tapered steel beams is presented, where the adverse influence of the development of plasticity and imperfections on the ultimate member strengths are fully accounted for through stiffness reduction, the presented method does not require any further global instability assessment using member design equations; thus, the proposed method is both direct and practical.
31 citations
TL;DR: In this paper, a finite element model able to replicate the lateral torsional buckling response of steel beams at elevated temperatures is developed and validated, and the validated finite element models are used to carry out extensive parametric studies to explore the LTB behaviour of steel beam in fire, considering various cross-section shapes, member slendernesses, steel grades, elevated temperature levels and different fabrication processes.
27 citations