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Experimental and parametric studies of SCFs in FRP strengthened tubular T-joints under axially loaded brace
Highlights Strengthening the T-joint test specimen with 10 layers of Glass/Vinyl ester, resulted in SCF reduction at both Crown (28%) and Saddle (27%). Increasing β and γ enhanced the SCF reducing effect of FRP, while increasing τ led to less effectiveness at Saddle. Comprehensive parametric studies were conducted to investigate the effect of joint geometrical and FRP parameters on SCFs in the FRP strengthened T-joints. A new set of SCF design equations was proposed for the fatigue design of FRP strengthened tubular T-joints under brace axial loading.
Abstract An experimental program was carried out on an axially loaded steel welded tubular T-joint made of circular hollow sections and strengthened with Glass/vinyl ester to study the effect of Glass Fiber Reinforced Polymer (GFRP) material on the Stress Concentration Factors (SCF) at both crown and saddle points on the chord member. Four tests were executed. The first test was performed on the plain joint which served as the reference for comparison, and the remaining three tests were performed on the strengthened joints with various FRP strengthening schemes. The arrangement of tests as well as specimen details together with most pertinent results are discussed. A significant drop in SCF values was observed for the FRP-strengthened T-joint as compared to the SCFs of the corresponding un-strengthened joint. The finite element model of the T-joint specimens were made and verified against the experimental data. Furthermore, extensive numerical analyses comprising of 1188 finite element models were performed to achieve a better understanding of the effect of the FRP parameters as well as the joint’s geometric parameters on the chord's SCFs. Additionally, through nonlinear regression analysis, SCF design equations were proposed for the fatigue design of axially loaded FRP strengthened tubular T-joints.
Experimental and parametric studies of SCFs in FRP strengthened tubular T-joints under axially loaded brace
Highlights Strengthening the T-joint test specimen with 10 layers of Glass/Vinyl ester, resulted in SCF reduction at both Crown (28%) and Saddle (27%). Increasing β and γ enhanced the SCF reducing effect of FRP, while increasing τ led to less effectiveness at Saddle. Comprehensive parametric studies were conducted to investigate the effect of joint geometrical and FRP parameters on SCFs in the FRP strengthened T-joints. A new set of SCF design equations was proposed for the fatigue design of FRP strengthened tubular T-joints under brace axial loading.
Abstract An experimental program was carried out on an axially loaded steel welded tubular T-joint made of circular hollow sections and strengthened with Glass/vinyl ester to study the effect of Glass Fiber Reinforced Polymer (GFRP) material on the Stress Concentration Factors (SCF) at both crown and saddle points on the chord member. Four tests were executed. The first test was performed on the plain joint which served as the reference for comparison, and the remaining three tests were performed on the strengthened joints with various FRP strengthening schemes. The arrangement of tests as well as specimen details together with most pertinent results are discussed. A significant drop in SCF values was observed for the FRP-strengthened T-joint as compared to the SCFs of the corresponding un-strengthened joint. The finite element model of the T-joint specimens were made and verified against the experimental data. Furthermore, extensive numerical analyses comprising of 1188 finite element models were performed to achieve a better understanding of the effect of the FRP parameters as well as the joint’s geometric parameters on the chord's SCFs. Additionally, through nonlinear regression analysis, SCF design equations were proposed for the fatigue design of axially loaded FRP strengthened tubular T-joints.
Experimental and parametric studies of SCFs in FRP strengthened tubular T-joints under axially loaded brace
Sadat Hosseini, Alireza (author) / Bahaari, Mohammad Reza (author) / Lesani, Mohammad (author)
Engineering Structures ; 213
2020-03-18
Article (Journal)
Electronic Resource
English
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