Experimental and Numerical Investigation on Behavior of Rectangular Closed Section Steel Truss Beams with Concrete-Filled Joints

This study investigates the flexural performance of steel trusses with concrete infill and gradient stiffeners at the joints. Three specimens were fabricated and subjected to flexural tests. A finite element model was developed and validated based on experimental results. This model was used to stud...

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Published inBuildings (Basel) Vol. 14; no. 12; p. 3857
Main Authors He, Junlong, Kong, Fanlei, Huang, Pingming, Mei, Kuihua
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2024
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Abstract This study investigates the flexural performance of steel trusses with concrete infill and gradient stiffeners at the joints. Three specimens were fabricated and subjected to flexural tests. A finite element model was developed and validated based on experimental results. This model was used to study the stiffness to evaluate the effects of concrete infill and gradient stiffeners at joints on the steel truss. The results demonstrated that all three specimens were subjected to joint tensile–compression failure. The ultimate bearing capacity of specimens with concrete infill and stiffening ribs increased by 29.7% and 35.6%, respectively. The displacement deformation of joints decreased by 21.6% and 18.9%, respectively, and the initial stiffness increased by 31.3% and 39.1%, respectively. Therefore, the concrete infill significantly enhanced the ultimate bearing capacity and flexural stiffness of the steel truss while reducing slip deformation at the joints. The concrete infill improved the deformation resistance of the joints and increased the overall stiffness of the structure. Gradient stiffeners had a limited effect on enhancing the ultimate bearing capacity and flexural stiffness but contributed to a smoother stress transition between filled and unfilled sections. This could also reduce stress distortion at the joints.
AbstractList This study investigates the flexural performance of steel trusses with concrete infill and gradient stiffeners at the joints. Three specimens were fabricated and subjected to flexural tests. A finite element model was developed and validated based on experimental results. This model was used to study the stiffness to evaluate the effects of concrete infill and gradient stiffeners at joints on the steel truss. The results demonstrated that all three specimens were subjected to joint tensile–compression failure. The ultimate bearing capacity of specimens with concrete infill and stiffening ribs increased by 29.7% and 35.6%, respectively. The displacement deformation of joints decreased by 21.6% and 18.9%, respectively, and the initial stiffness increased by 31.3% and 39.1%, respectively. Therefore, the concrete infill significantly enhanced the ultimate bearing capacity and flexural stiffness of the steel truss while reducing slip deformation at the joints. The concrete infill improved the deformation resistance of the joints and increased the overall stiffness of the structure. Gradient stiffeners had a limited effect on enhancing the ultimate bearing capacity and flexural stiffness but contributed to a smoother stress transition between filled and unfilled sections. This could also reduce stress distortion at the joints.
Audience Academic
Author Kong, Fanlei
Huang, Pingming
He, Junlong
Mei, Kuihua
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StartPage 3857
SubjectTerms Bearing capacity
Concrete
concrete infill
Deformation effects
Deformation resistance
Finite element method
flexural stiffness
flexural test
Metal fatigue
Numerical analysis
Redevelopment
Slip resistance
Steel
Steel pipes
Steel structures
steel truss
Stiffeners
Stiffening
Stiffness
Strain gauges
Stress analysis
Stress concentration
Trusses
ultimate bearing capacity
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Title Experimental and Numerical Investigation on Behavior of Rectangular Closed Section Steel Truss Beams with Concrete-Filled Joints
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