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Experimental and numerical study on compressive behavior of welded hollow spherical joints with external stiffeners
Abstract Welded hollow spherical joints are one of the most popular joints used in reticulated shell structures. Welded hollow spherical joints in service may need to be strengthened due to age-related damage or unexpected overloading. Adding external stiffeners to the welded hollow spherical joint is an effective way to strengthen it. In this paper, experimental and numerical studies are performed to investigate the enhanced behavior of welded hollow spherical joint with external stiffeners. Axial compression tests of five specimens are performed with a particular focus on the effects of the number, height, and thickness of the external stiffeners on the load-bearing capacity of the joint. A 3D finite element model is developed and calibrated against the experimental results. Parametric studies on a number of design variables are conducted using the calibrated finite element model. The results show that the external stiffeners significantly enhanced the compressive capacity of the joint, and the compressive capacity of the joint is increasing with the number, height, and thickness of the external stiffeners increasing. It is also found that the diameter of the hollow sphere has little impact on the enhanced behavior of the welded hollow spherical joint with external stiffeners. Practical formulas for axial load-bearing capacity and initial axial stiffness of the welded hollow sphere joint with external stiffeners are developed, based on the results of parametric studies.
Graphical abstract Comparison of enhancement coefficients of load-bearing capacity determined by experiments, numerical simulations and proposed formula. Display Omitted
Highlights Few researches on the mechanical properties of welded hollow spherical joints (WHSJs) with external stiffeners. The failure mode of WHSJs with external stiffeners was obtained through axial compression tests with five specimens. Numerical study on the effects of different parameters on the compressive behavior of WHSJs with external stiffeners. The formulas for calculating the load-bearing capacity and initial axial stiffness of WHSJs with external stiffeners.
Experimental and numerical study on compressive behavior of welded hollow spherical joints with external stiffeners
Abstract Welded hollow spherical joints are one of the most popular joints used in reticulated shell structures. Welded hollow spherical joints in service may need to be strengthened due to age-related damage or unexpected overloading. Adding external stiffeners to the welded hollow spherical joint is an effective way to strengthen it. In this paper, experimental and numerical studies are performed to investigate the enhanced behavior of welded hollow spherical joint with external stiffeners. Axial compression tests of five specimens are performed with a particular focus on the effects of the number, height, and thickness of the external stiffeners on the load-bearing capacity of the joint. A 3D finite element model is developed and calibrated against the experimental results. Parametric studies on a number of design variables are conducted using the calibrated finite element model. The results show that the external stiffeners significantly enhanced the compressive capacity of the joint, and the compressive capacity of the joint is increasing with the number, height, and thickness of the external stiffeners increasing. It is also found that the diameter of the hollow sphere has little impact on the enhanced behavior of the welded hollow spherical joint with external stiffeners. Practical formulas for axial load-bearing capacity and initial axial stiffness of the welded hollow sphere joint with external stiffeners are developed, based on the results of parametric studies.
Graphical abstract Comparison of enhancement coefficients of load-bearing capacity determined by experiments, numerical simulations and proposed formula. Display Omitted
Highlights Few researches on the mechanical properties of welded hollow spherical joints (WHSJs) with external stiffeners. The failure mode of WHSJs with external stiffeners was obtained through axial compression tests with five specimens. Numerical study on the effects of different parameters on the compressive behavior of WHSJs with external stiffeners. The formulas for calculating the load-bearing capacity and initial axial stiffness of WHSJs with external stiffeners.
Experimental and numerical study on compressive behavior of welded hollow spherical joints with external stiffeners
Xu, Xian (author) / Shu, Tingting (author) / Zheng, Junhua (author) / Luo, Yaozhi (author)
2021-10-30
Article (Journal)
Electronic Resource
English
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