Inelastic Lateral-Torsional Buckling Load on Fixed Circular Channels Arches Under Transverse Point Load

<p>A series of six 3D printed discretely optimized truss specimens and two warren truss specimens were experimentally loaded until failure. The results were compared to the theoretical failure loads and stresses determined using Maxwell’s Method. Each set of truss specimens were loaded in a simple span condition, with a point load applied at the center of the span. Each truss specimen was configured into pairs in order to prevent lateral torsional buckling (LTB) while testing. Strain, load, and displacement data was gathered for each truss specimen tested. These results were compared to the predicted results calculated by Maxwell’s theorem. Of the 6 specimens tested, all of the trusses failed within 1% - 20% of the analytical vales. The trends in the experimental results support efficacy of previously developed theories of optimized truss topology in order to increase strength and efficiency of lateral systems in high rise structures.</p>

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Effect of Eccentric Lateral Bracing Stiffness on Lateral Torsional Buckling Resistance of Wooden Beams

International Journal of Structural Stability and Dynamics ◽

10.1142/s021945541850027x ◽

2018 ◽

Vol 18 (02) ◽

pp. 1850027 ◽

Cited By ~ 3

Author(s):

Ye Hu ◽

Magdi Mohareb ◽

Ghasan Doudak

Keyword(s):

Threshold Value ◽

Point Load ◽

Symmetric Mode ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Buckling Modes ◽

Buckling Resistance ◽

Load Height ◽

Lateral Bracing ◽

Critical Moments

An energy-based solution is developed for the lateral torsional buckling (LTB) analysis of wooden beams with flexible mid-span lateral bracing offset from section mid-height and subjected to uniformly distributed or mid-span point load. The study shows that such beams are prone to two potential buckling modes; symmetric or anti-symmetric. The symmetric mode is shown to govern the capacity of the beam for low bracing stiffness while the anti-symmetric mode governs the capacity when the bracing stiffness exceeds a threshold value. Using the present formulation, the threshold bracing stiffness required to suppress the symmetric mode and maximize the critical moments is directly obtained by solving a special eigenvalue problem in the unknown bracing stiffness. The technique thus eliminates the need for trial and error in standard solutions. A parametric study is conducted to investigate the effect of bracing height, load height, and bracing stiffness on the critical moments. A large database of runs is generated and used to develop simple expressions for determining the threshold bracing stiffness required to maximize the elastic LTB resistance.

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Lateral-torsional buckling of arches under an arbitrary radial point load in a thermal environment incorporating shear deformations

Engineering Structures ◽

10.1016/j.engstruct.2018.10.071 ◽

2019 ◽

Vol 179 ◽

pp. 189-203 ◽

Cited By ~ 8

Author(s):

Hanwen Lu ◽

Airong Liu ◽

Yong-Lin Pi ◽

Mark Andrew Bradford ◽

Jiyang Fu

Keyword(s):

Thermal Environment ◽

Point Load ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Shear Deformations

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Lateral-Torsional Buckling Strength of Two-Span Glass Fiber Reinforced Polymer Beams

European Journal of Engineering Research and Science ◽

10.24018/ejers.2020.5.11.2211 ◽

2020 ◽

Vol 5 (11) ◽

pp. 1319-1321

Author(s):

Mojtaba B. Sirjani ◽

Zia Razzaq

Keyword(s):

Glass Fiber ◽

Load Capacity ◽

Buckling Load ◽

Fiber Reinforced Polymer ◽

Fiber Reinforced ◽

Glass Fiber Reinforced Polymer ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Reinforced Polymer ◽

Glass Fiber Reinforced

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.

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STUDI EKSPERIMENTAL KUAT LENTUR BAJA PROFIL I KOMPAK SIMETRIS GANDA BERDASARKAN RSNI 03-1729-201X

Forum Mekanika ◽

10.33322/forummekanika.v6i2.122 ◽

1970 ◽

Vol 6 (2) ◽

pp. 99-105

Author(s):

Redaksi Tim Jurnal

Keyword(s):

Flexural Strength ◽

Cross Section ◽

Experimental Testing ◽

Point Load ◽

National Standard ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Element Analysis ◽

Long Span ◽

The Stability

The danger of buckling and instability structures easily occurs on the steel beam structure, it will make the structure fails before it reaches the cross section ultimate capacity.In that case the strength of a beam is not only determined by cross-section ultimate capacity. The instability of the structure causes lateral torsional buckling eventhough there is no torque on the beam. There is one way to support the stability of the beam; by installing lateral support on its side. This research is intended to obtain information about flexural strength by comparing the theoretical results based on SNI 03-1729-2002 and (Indonesian National Standard Draft) RSNI 03-1729.1- 201x with the results of experimental testing and finite element analysis results (using the ABAQUS program). The flexural specimens which are studied are in the long-span with a length of 3.3 meters span test. The loading uses three-point load system. The results of the test show information that flexural strength for the long-span specimen from experimental test results has the smallest difference of 33.18% of the theoretical result. As for analysis with FEM also hasthe same difference of 33.18% with the experimental results. Failure that occurs for long-span specimen is due to lateral torsional buckling failures.

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Responses of PFRP Cantilevered Channel Beams under Tip Point Loads

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.471-472.578 ◽

2011 ◽

Vol 471-472 ◽

pp. 578-583 ◽

Cited By ~ 5

Author(s):

Jaksada Thumrongvut ◽

Sittichai Seangatith

Keyword(s):

Beam Theory ◽

Point Load ◽

Lateral Torsional Buckling ◽

Torsional Buckling ◽

Buckling Loads ◽

Linear Elastic ◽

Reinforced Plastic ◽

Modification Factor ◽

Elastic Responses ◽

Structural Behaviors

In this paper, the experimental results on the structural behaviors of the pultruded fiber reinforced plastic (PFRP) cantilevered channel beams under tip point load are presented. The dimensions of the beam specimens are 76 22 6, 102 29 6 and 152 43 10 mm. The span-to-depth ratios of the specimens are in the range of 10 to 46. A total of 36 specimens were tested to investigate the effect of unbraced length of the beam on the behavior of lateral-torsional buckling and buckling load. Then, the obtained buckling loads were compared to the critical buckling loads calculated by using the modified classical beam theory. From the tests, it was found that the beams have linear elastic responses up to 90-95% of their buckling loads. The mode of failure of the specimens is in the form of lateral-torsional buckling. The modified Timoshenko and Gere’s equation unsatisfactorily predicts the critical buckling loads of the beams. Finally, by using a curve fitting, a modification factor was proposed, and the obtained test results and those calculated by the proposed modified equation are in good agreement.

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