Stiffness of RHS "T" Joints under Combined Brace Bending and Axial Loading

2014 ◽  
Author(s):  
R.M.M.P. Matos ◽  
L.F. Costa Neves ◽  
L.R.O. de Lima ◽  
P.C.G. da S. Vellasco ◽  
J.G. Santos da Silva
Keyword(s):  
Axial Loading ◽  
T Joints

STRUCTURAL STRESS METHOD FOR FATIGUE DESIGN OF CONCRETE FILLED STEEL TUBULAR T-JOINTS UNDER AXIAL LOADING

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Idris A. Musa
Keyword(s):  
Fatigue Life ◽  
Three Dimensional ◽  
Axial Loading ◽  
Fe Model ◽  
Structural Stress ◽  
Stress Concentrations ◽  
Engineering Structures ◽  
T Joints ◽  
Tubular Joints ◽  
Concrete Filling

Steel tubular structural members are being widely used in various engineering structures. The steel tubular joints will have fatigue problem when subjected to repetitive loading. Fatigue strength is one of the key factors that control the design of steel tubular joints in structures subjected to frequent loading. Research has shown that concrete filling of the steel tubes can effectively reduce stress concentrations at the joint. In this study, the structural stress method which involves the through-thickness stress distribution, has been employed to estimate the fatigue life of concrete filled steel tubular (CFST) T-joints under axial loading in the brace. A Finite Element (FE) model has been developed using ABAQUS. The three-dimensional 8-node hexahedral element has been employed in the FE model. The structural stresses have been extracted and the fatigue life of the joint has been estimated. The results have been verified using experimental results reported in the literature. The current study showed that the structural stress method can effectively predict reliable fatigue life in concrete filled steel tubular (CFST) T-joints.

Fatigue Behavior of Welded T-Joints with a CHS Brace and CFCHS Chord under Axial Loading in the Brace

2013 ◽  
Vol 18 (2) ◽  
pp. 142-152 ◽  
Author(s):  
Ke Wang ◽  
Le-Wei Tong ◽  
Jun Zhu ◽  
Xiao-Ling Zhao ◽  
Fidelis R. Mashiri
Keyword(s):  
Fatigue Behavior ◽  
Axial Loading ◽  
T Joints

scholarly journals Effect of geometric parameters and combined loading on stress distribution of tubular T-joints

Mechanika ◽  
2019 ◽  
Vol 25 (5) ◽  
pp. 350-356
Author(s):  
Samira Belhour ◽  
Hafida Kahoul ◽  
Ahmed Bellaouar ◽  
Sébastien Murer
Keyword(s):  
Axial Loading ◽  
Computation Time ◽  
Geometric Parameters ◽  
Combined Loading ◽  
Offshore Platforms ◽  
Tubular Structures ◽  
Stress Concentrations ◽  
Standard Samples ◽  
T Joints ◽  
Modeling And Analysis

Steel tubular structures are widely used in the construction of offshore platforms and T-type junctions are extensively used in this domain. The tubular members are welded, which generates significant stress concentrations at the edges. The stress levels reached in these critical places are used to assess lifetimes based on fatigue curves from tests conducted on standard samples. This study is devoted to the modeling and analysis of T-type welded tubular structures for the determination of hot spots stresses (HSS) at the chord/brace intersection, A numerical analysis was carried out to study the effect of a combined loading composed of an axial loading and a continuation of rational bending, that best assimilate real conditions, as well as the effect of normalized geometric parameters α, β, g on the distribution of stress concentration (area and values) of T-joints. The mechanical behaviour has been modeled in 2D using quadrangular and triangular thin-shell elements by the finite element method (FEM). It is the most appropriate approach because it considers all geometric complexities and singularities of the structure, while the efforts as well as the computation time are considerably reduced compared to an experimental study or to complex FE models implementing solid elements. In this study, we use the COMSOL-MULTIPHYSICS® software...

The Parametrical Stress Analysis of Tubular T Joints

1985 ◽  
Vol 107 (4) ◽  
pp. 473-478
Author(s):  
T.-Y. Chen ◽  
B.-Z. Chen ◽  
Y.-Q. Wang
Keyword(s):  
Experimental Data ◽  
Stress Concentration ◽  
Stress Analysis ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Axial Loading ◽  
Geometric Parameters ◽  
T Joints ◽  
Data Tables ◽  
The Relationship

The relationship between the geometric parameters of α, β, γ and τ of tubular T joints and chord stress concentration factor, SCF, has been investigated. With the use of calculated values as well as experimental data tables were compiled for a wide variety of cases when axial loading on the branch is applied. Finally, a probability analysis is given as to the reliability of using a particular SCF value.

Stresses in Stiffened Tubular T Joint of an Offshore Structure

1983 ◽  
Vol 105 (2) ◽  
pp. 177-183 ◽  
Author(s):  
M. R. Shiyekar ◽  
M. Kalani ◽  
R. M. Belkune
Keyword(s):  
Finite Element ◽  
Axial Loading ◽  
Offshore Structures ◽  
Internal Ring ◽  
Joint Models ◽  
Offshore Structure ◽  
T Joints ◽  
Tubular Joint ◽  
Simplified Analysis ◽  
Element Technique

The effect of internal ring stiffeners has been studied theoretically and experimentally for the welded tubular T joints occurring in conventional jacket-type offshore structures. Four welded tubular joint models of T shape, with different diameter ratios, have been tested under axial loading in the branch. The analytical results have been obtained by finite element technique. The results indicate a significant reduction in the stress concentration factor and a fairly uniform transfer of load from branch to the chord. A simplified analysis of stiffener rings have been proposed. The stress results of joints strengthened by ring stiffeners and joint can are compared.

Evaluating the Stress Intensity Modification Factor in Offshore Tubular T Joints Using Artificial Neural Networks

2004 ◽  
Author(s):  
Ali Fathi ◽  
A. A. Aghakouchak ◽  
Gh. A. Montazer
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Cracks ◽  
Crack Depth ◽  
Axial Loading ◽  
T Joints ◽  
Modification Factor ◽  
Artificial Neural

Linear Elastic Fracture Mechanics (LEFM) and Stress Intensity Factor (SIF) are applicable tools to evaluate growth rate of existing fatigue cracks in offshore tubular joints. This is because the plastic zone around the fatigue crack tips is satisfactorily small. Several approaches based on LEFM have been proposed in this regard. Each of them uses different methods for estimating Stress Intensity Modification Factor (Y). In this research two types of Artificial Neural Networks (ANN) are trained for predicting the Y factor: Radial Basis Function (RBF) and Multi Layer Perceptron (MLP) networks. These networks are capable of estimating the Y factor at deepest point of a fatigue crack, located in tubular T joints under axial loading, when the crack depth is more than 20% of chord wall thickness. The required input data consist of the crack shape and the percent of the crack growth through thickness. Experimental data from NDE center in University College London are used for training and testing the networks. This data has been gathered by applying constant amplitude axial load to the brace of six full-scaled T joints. The results of this research are compared with different empirical and semi-empirical solutions, used in previous research works. The Y factors obtained from networks show better agreement with actual ones when compared to those obtained from previously established methods.

Experimental Study on SNCF of Welded CHS-CFSHS T-Joints under Axial Loading

2010 ◽  
Vol 163-167 ◽  
pp. 127-131
Author(s):  
De Lei Yang ◽  
Le Wei Tong ◽  
Xiao Lin Zhao
Keyword(s):  
Experimental Study ◽  
Axial Loading ◽  
T Joints ◽  
Strain Concentration ◽  
Hollow Section ◽  
Lower Strain ◽  
Tension And Compression ◽  
Concentration Factors ◽  
Intersection Line ◽  
Circular Hollow Section

The initiation position can be predicted by studying on strain concentration factors (SNCF) and SNCF distributions. This paper concerns an experimental investigation of SNCF of welded T-joints composed of circular hollow section (CHS) braces and concrete-filled square hollow section (CFSHS) chords under axial loading on the braces with two load cases of tension and compression. Static experiments were performed on eight test specimens designed for considering different non-dimensional geometric parameters and C50 grade concrete. Compared with joints made of CHS-SHS, the experimental results indicate that the CHS-CFSHS T-joints have lower strain concentration factors which may increase fatigue strength. The position of the maximum SNCF is usually located at 00 or 900 of the intersection line between a CHS brace and a CFSHS chord.

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