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The effect of brace thickness on the characteristic fatigue damage of the selected joints is also analyzed by a sensitivity study.
A series of tests were carried out by using the verified finite element model to measure the SCF of circular chord and square braces K-joints with a reasonable range of three important parameters, i.e. β ratio of brace side length to chord diameter), 2γ ratio of chord diameter to chord thickness), τ ratio of brace thickness to chord thickness).
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Test results indicated that the failure modes and the connection efficiency of these joints significantly depended on the brace-to-chord thickness ratio τ and the brace-to-chord diameter ratio β.
Furthermore, a parametric study is performed in order to see the variation of the results for several diameters, thicknesses and brace inclination combinations.
The test parameters included gusset plate thickness, size, and brace angle.
A series of tests were conducted where some key parameters were varied, including loading angle, hollow ratio, chord wall thickness, as well as brace to chord diameter ratio.
The effects of SHS brace width to SHS chord width ratio, reinforced plates thickness to SHS chord wall thickness ratio, and reinforced plates length to SHS brace width ratio on the ultimate capacities of collar and doubler plates reinforced SHS X-joints were evaluated.
The test program examined the effects of a number of variables, including the presence or absence of the vent hole, the dimensions of the RHS, the ratio of the brace/chord wall thicknesses and the angle between the brace and the chord members.
The predicted nominal lateral yield strength, S yn, of the wall was based on the tension yield strength of the braces determined using their nominal area (width × thickness) as well as the minimum specified (nominal) yield stress.
The effects of SHS brace to SHS chord width ratio, SHS chord width to 2 times thickness ratio, and SHS brace to SHS chord thickness ratio on the ultimate strengths of square and diamond bird-beak SHS T-joints were evaluated.
The effects of brace to chord width ratio, reinforcement type and reinforced plate thickness on the structural behaviour of SHS T-joints under axial compression were evaluated.
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