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Zhongwei Zhao - One of the best experts on this subject based on the ideXlab platform.
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Probability distribution model of the Bending Capacity for WHSJ with multiple randomly pitting corrosion
Structures, 2020Co-Authors: Ye Yuan, Zhongwei Zhao, Haiqing Liu, Renzhang YanAbstract:Abstract Welded hollow spherical joints (WHSJs) are commonly used joints in reticulated shell structures. Corrosion that occurs on the surface of WHSJs can considerably reduce the Bending Capacity of WHSJs. Randomness, including random location and size, is the nature of corrosion. Random size is indicated by random planar size and random thickness. The corrosion of steel structures is always a multiple random problem. A series of nonlinear numerical analysis is conducted in this work to investigate the probabilistic distribution of Bending Capacity of WHSJs. The objectives of this work are to investigate the influence of corrosion parameters on Bending Capacity and construct a probabilistic distribution model of the Bending Capacity of WHSJs with multiple randomly pitting corrosion. The method to determine the probabilistic model of WHSJs in actual condition is also discussed. This work can serve as a basis for the stochastic analysis of integral structures connected by WHSJs with randomly located corrosion.
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Influence of compression force on the probability distribution of moment Capacity for WHSJs with randomly located corrosion
Journal of Building Engineering, 2020Co-Authors: Zhongwei Zhao, Bing Liang, Ye Yuan, Mengzhou Zhang, Haiqing LiuAbstract:Abstract Welded hollow spherical joints (WHSJs) are commonly used in reticulated shell structures. Corrosion on the surfaces of WHSJs can drastically reduce their loading Capacity. WHSJs in reticulated shell structures are constantly subjected to compression force and moment. Compression force may affect the probability distribution of the moment Capacity of WHSJs with randomly distributed corrosion. A large number of stochastic FE analyses were conducted in this work to investigate the influence of compression force on the probabilistic distribution of the Bending Capacity of WHSJs. The objectives of this work were to investigate the influence of compression force on Bending Capacity and to construct a probabilistic distribution model of Bending Capacity that considers the influence of compression force. The proposed method was validated and determined to have high accuracy in predicting the probabilistic distribution of the Bending Capacity of WHSJs in a complex force state.
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Influence of pitting corrosion on the Bending Capacity of thin-walled circular tubes
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing Liang, Wu XiufengAbstract:Thin-walled circular tubes (TWCTs) have been extensively used in space lattice structures and other industrial areas. Corrosion is inevitable for steel structures with regard to its service life, and it will remarkably reduce the loading Capacity and critically threaten the structural safety. The present work aims to investigate the influence of pitting corrosion on the Bending Capacity of TWCT. A series of nonlinear numerical analyses was conducted to investigate the influences of corrosion pit shape, specification, corrosion thickness, diameter, and thickness of TWCT on Bending Capacity. Corrosion was simulated by reducing the thickness of shell element. Random corrosion distribution was generated, and its influence on Bending Capacity was estimated. The method for generating a random corrosion would provide a reference for the analysis of other structures with corrosion.
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Bending Capacity of corroded welded hollow spherical joints
Thin-Walled Structures, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing LiangAbstract:Abstract Welded hollow spherical joints (WHSJ) have been widely used in space lattice structures. Corrosion is inevitable in the service life of WHSJ, which significantly reduces their Bending Capacity and seriously threatens their structural safety. This study aims to investigate the influence of corrosion that occurred at different places on the Bending stiffness and Bending Capacity of WHSJ. The effects of corroded location and size, corroded thickness, and diameter and thickness of spherical body were investigated through a series of nonlinear numerical analyses. Two types of corroded shape were investigated. The equation used for predicting the residual Bending stiffness of corroded WHSJ was established. Results indicated that corrosions in different places had distinct influence on the Bending Capacity of WHSJ. Loading Capacity could be significantly reduced when corrosion occurred at other areas. The derived results would provide a foundation for estimating the residual Bending stiffness and strength of structures connected by corroded WHSJ.
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Assessment of the Bending Capacity of welded hollow spherical joints with pit corrosion
Thin-Walled Structures, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing LiangAbstract:Abstract Welded hollow spherical joints (WHSJs) are widely used in space lattice structures. Corrosion is inevitable for WHSJs during service, and this phenomenon will significantly reduce loading Capacity and seriously threaten the structural safety. Pit corrosion is a typical corrosion type for steel structures. In this study, nonlinear numerical analyses were conducted to investigate the influence of several parameters on the Bending Capacity of a WHSJ. A numerical model of the WHSJ with random pit corrosion was proposed to investigate the mechanical behavior of the corroded WHSJ. Results indicated that the moment Capacity of the WHSJ with random corrosion pits was normally distributed. A probabilistic distribution model of the corroded WHSJ was proposed. The failure probability could be deduced based on the formulae of the upper and lower bounds of the moment Capacity.
Haiqing Liu - One of the best experts on this subject based on the ideXlab platform.
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Probability distribution model of the Bending Capacity for WHSJ with multiple randomly pitting corrosion
Structures, 2020Co-Authors: Ye Yuan, Zhongwei Zhao, Haiqing Liu, Renzhang YanAbstract:Abstract Welded hollow spherical joints (WHSJs) are commonly used joints in reticulated shell structures. Corrosion that occurs on the surface of WHSJs can considerably reduce the Bending Capacity of WHSJs. Randomness, including random location and size, is the nature of corrosion. Random size is indicated by random planar size and random thickness. The corrosion of steel structures is always a multiple random problem. A series of nonlinear numerical analysis is conducted in this work to investigate the probabilistic distribution of Bending Capacity of WHSJs. The objectives of this work are to investigate the influence of corrosion parameters on Bending Capacity and construct a probabilistic distribution model of the Bending Capacity of WHSJs with multiple randomly pitting corrosion. The method to determine the probabilistic model of WHSJs in actual condition is also discussed. This work can serve as a basis for the stochastic analysis of integral structures connected by WHSJs with randomly located corrosion.
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Influence of compression force on the probability distribution of moment Capacity for WHSJs with randomly located corrosion
Journal of Building Engineering, 2020Co-Authors: Zhongwei Zhao, Bing Liang, Ye Yuan, Mengzhou Zhang, Haiqing LiuAbstract:Abstract Welded hollow spherical joints (WHSJs) are commonly used in reticulated shell structures. Corrosion on the surfaces of WHSJs can drastically reduce their loading Capacity. WHSJs in reticulated shell structures are constantly subjected to compression force and moment. Compression force may affect the probability distribution of the moment Capacity of WHSJs with randomly distributed corrosion. A large number of stochastic FE analyses were conducted in this work to investigate the influence of compression force on the probabilistic distribution of the Bending Capacity of WHSJs. The objectives of this work were to investigate the influence of compression force on Bending Capacity and to construct a probabilistic distribution model of Bending Capacity that considers the influence of compression force. The proposed method was validated and determined to have high accuracy in predicting the probabilistic distribution of the Bending Capacity of WHSJs in a complex force state.
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Influence of pitting corrosion on the Bending Capacity of thin-walled circular tubes
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing Liang, Wu XiufengAbstract:Thin-walled circular tubes (TWCTs) have been extensively used in space lattice structures and other industrial areas. Corrosion is inevitable for steel structures with regard to its service life, and it will remarkably reduce the loading Capacity and critically threaten the structural safety. The present work aims to investigate the influence of pitting corrosion on the Bending Capacity of TWCT. A series of nonlinear numerical analyses was conducted to investigate the influences of corrosion pit shape, specification, corrosion thickness, diameter, and thickness of TWCT on Bending Capacity. Corrosion was simulated by reducing the thickness of shell element. Random corrosion distribution was generated, and its influence on Bending Capacity was estimated. The method for generating a random corrosion would provide a reference for the analysis of other structures with corrosion.
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Bending Capacity of corroded welded hollow spherical joints
Thin-Walled Structures, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing LiangAbstract:Abstract Welded hollow spherical joints (WHSJ) have been widely used in space lattice structures. Corrosion is inevitable in the service life of WHSJ, which significantly reduces their Bending Capacity and seriously threatens their structural safety. This study aims to investigate the influence of corrosion that occurred at different places on the Bending stiffness and Bending Capacity of WHSJ. The effects of corroded location and size, corroded thickness, and diameter and thickness of spherical body were investigated through a series of nonlinear numerical analyses. Two types of corroded shape were investigated. The equation used for predicting the residual Bending stiffness of corroded WHSJ was established. Results indicated that corrosions in different places had distinct influence on the Bending Capacity of WHSJ. Loading Capacity could be significantly reduced when corrosion occurred at other areas. The derived results would provide a foundation for estimating the residual Bending stiffness and strength of structures connected by corroded WHSJ.
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Assessment of the Bending Capacity of welded hollow spherical joints with pit corrosion
Thin-Walled Structures, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing LiangAbstract:Abstract Welded hollow spherical joints (WHSJs) are widely used in space lattice structures. Corrosion is inevitable for WHSJs during service, and this phenomenon will significantly reduce loading Capacity and seriously threaten the structural safety. Pit corrosion is a typical corrosion type for steel structures. In this study, nonlinear numerical analyses were conducted to investigate the influence of several parameters on the Bending Capacity of a WHSJ. A numerical model of the WHSJ with random pit corrosion was proposed to investigate the mechanical behavior of the corroded WHSJ. Results indicated that the moment Capacity of the WHSJ with random corrosion pits was normally distributed. A probabilistic distribution model of the corroded WHSJ was proposed. The failure probability could be deduced based on the formulae of the upper and lower bounds of the moment Capacity.
Bing Liang - One of the best experts on this subject based on the ideXlab platform.
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Influence of compression force on the probability distribution of moment Capacity for WHSJs with randomly located corrosion
Journal of Building Engineering, 2020Co-Authors: Zhongwei Zhao, Bing Liang, Ye Yuan, Mengzhou Zhang, Haiqing LiuAbstract:Abstract Welded hollow spherical joints (WHSJs) are commonly used in reticulated shell structures. Corrosion on the surfaces of WHSJs can drastically reduce their loading Capacity. WHSJs in reticulated shell structures are constantly subjected to compression force and moment. Compression force may affect the probability distribution of the moment Capacity of WHSJs with randomly distributed corrosion. A large number of stochastic FE analyses were conducted in this work to investigate the influence of compression force on the probabilistic distribution of the Bending Capacity of WHSJs. The objectives of this work were to investigate the influence of compression force on Bending Capacity and to construct a probabilistic distribution model of Bending Capacity that considers the influence of compression force. The proposed method was validated and determined to have high accuracy in predicting the probabilistic distribution of the Bending Capacity of WHSJs in a complex force state.
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Influence of pitting corrosion on the Bending Capacity of thin-walled circular tubes
Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing Liang, Wu XiufengAbstract:Thin-walled circular tubes (TWCTs) have been extensively used in space lattice structures and other industrial areas. Corrosion is inevitable for steel structures with regard to its service life, and it will remarkably reduce the loading Capacity and critically threaten the structural safety. The present work aims to investigate the influence of pitting corrosion on the Bending Capacity of TWCT. A series of nonlinear numerical analyses was conducted to investigate the influences of corrosion pit shape, specification, corrosion thickness, diameter, and thickness of TWCT on Bending Capacity. Corrosion was simulated by reducing the thickness of shell element. Random corrosion distribution was generated, and its influence on Bending Capacity was estimated. The method for generating a random corrosion would provide a reference for the analysis of other structures with corrosion.
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Bending Capacity of corroded welded hollow spherical joints
Thin-Walled Structures, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing LiangAbstract:Abstract Welded hollow spherical joints (WHSJ) have been widely used in space lattice structures. Corrosion is inevitable in the service life of WHSJ, which significantly reduces their Bending Capacity and seriously threatens their structural safety. This study aims to investigate the influence of corrosion that occurred at different places on the Bending stiffness and Bending Capacity of WHSJ. The effects of corroded location and size, corroded thickness, and diameter and thickness of spherical body were investigated through a series of nonlinear numerical analyses. Two types of corroded shape were investigated. The equation used for predicting the residual Bending stiffness of corroded WHSJ was established. Results indicated that corrosions in different places had distinct influence on the Bending Capacity of WHSJ. Loading Capacity could be significantly reduced when corrosion occurred at other areas. The derived results would provide a foundation for estimating the residual Bending stiffness and strength of structures connected by corroded WHSJ.
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Assessment of the Bending Capacity of welded hollow spherical joints with pit corrosion
Thin-Walled Structures, 2018Co-Authors: Zhongwei Zhao, Haiqing Liu, Bing LiangAbstract:Abstract Welded hollow spherical joints (WHSJs) are widely used in space lattice structures. Corrosion is inevitable for WHSJs during service, and this phenomenon will significantly reduce loading Capacity and seriously threaten the structural safety. Pit corrosion is a typical corrosion type for steel structures. In this study, nonlinear numerical analyses were conducted to investigate the influence of several parameters on the Bending Capacity of a WHSJ. A numerical model of the WHSJ with random pit corrosion was proposed to investigate the mechanical behavior of the corroded WHSJ. Results indicated that the moment Capacity of the WHSJ with random corrosion pits was normally distributed. A probabilistic distribution model of the corroded WHSJ was proposed. The failure probability could be deduced based on the formulae of the upper and lower bounds of the moment Capacity.
Spyros A. Karamanos - One of the best experts on this subject based on the ideXlab platform.
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ultimate Bending Capacity of spiral welded steel tubes part i experiments
Thin-walled Structures, 2016Co-Authors: Sjors H. J. Van Es, A. M. Gresnigt, Daniel Vasilikis, Spyros A. KaramanosAbstract:Abstract The present investigation refers to the Bending Capacity of spiral-welded steel tubes. The first part of this investigation presents the results of a full-scale experimental program, aiming to investigate the structural behavior of large-diameter spiral-welded steel tubes under Bending. A companion paper (Part II) is also published, which further studies the behavior of these elements numerically, using finite element simulations. The testing program presented in Part I consists of thirteen 42-inch-diameter spiral-welded steel tubes with D/t ranging between 65 and 120. Some of the tubular specimens contain girth welds and coil connection welds, which are shown to penalize the ultimate Bending Capacity of the tubes. Extensive measurements of initial imperfections and material properties are performed for each tubular specimen. The material properties of the specimens are investigated through both uniaxial tensile and compression coupon tests. A series of large-scale four-point Bending tests is performed to determine the structural behavior of the tubes, resulting in local buckling failure of the tubes under consideration. The Bending behavior of the thirteen specimens is documented extensively. The study offers information with regard to the ultimate Bending resistance of the specimens. In addition, the full moment–curvature equilibrium path is presented, supplemented by measurements on the development of cross sectional ovalisation and tube wall wrinkling during the Bending tests.
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Ultimate Bending Capacity of spiral-welded steel tubes – Part I: Experiments
Thin-Walled Structures, 2016Co-Authors: Sjors H. J. Van Es, A. M. Gresnigt, Daniel Vasilikis, Spyros A. KaramanosAbstract:Abstract The present investigation refers to the Bending Capacity of spiral-welded steel tubes. The first part of this investigation presents the results of a full-scale experimental program, aiming to investigate the structural behavior of large-diameter spiral-welded steel tubes under Bending. A companion paper (Part II) is also published, which further studies the behavior of these elements numerically, using finite element simulations. The testing program presented in Part I consists of thirteen 42-inch-diameter spiral-welded steel tubes with D/t ranging between 65 and 120. Some of the tubular specimens contain girth welds and coil connection welds, which are shown to penalize the ultimate Bending Capacity of the tubes. Extensive measurements of initial imperfections and material properties are performed for each tubular specimen. The material properties of the specimens are investigated through both uniaxial tensile and compression coupon tests. A series of large-scale four-point Bending tests is performed to determine the structural behavior of the tubes, resulting in local buckling failure of the tubes under consideration. The Bending behavior of the thirteen specimens is documented extensively. The study offers information with regard to the ultimate Bending resistance of the specimens. In addition, the full moment–curvature equilibrium path is presented, supplemented by measurements on the development of cross sectional ovalisation and tube wall wrinkling during the Bending tests.
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ultimate Bending Capacity and buckling of pressurized 90 deg steel elbows
Journal of Pressure Vessel Technology-transactions of The Asme, 2006Co-Authors: Spyros A. Karamanos, D Tsouvalas, A. M. GresnigtAbstract:The paper examines the nonlinear elastic-plastic response of internally pressurized 90 deg pipe elbows under in-plane and out-of-plane Bending. Nonlinear shell elements from a general-purpose finite element program are employed to model the inelastic response of steel elbows and the adjacent straight parts. The numerical results are successfully compared with real-scale experimental measurements. The paper also presents a parametric study, aimed at investigating the effects of diameter-to-thickness ratio and moderate pressure levels on the ultimate Bending Capacity of 90 deg elbows, focusing on the failure mode (local buckling or cross-sectional flattening) and the maximum Bending moment. Special attention is given to the response of 90 deg elbows under out-of-plane Bending moments.
Jing Zhou - One of the best experts on this subject based on the ideXlab platform.
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Bending Capacity of Corroded Pipeline Subjected to Internal Pressure and Axial Loadings
Volume 3: Structures Safety and Reliability, 2018Co-Authors: Gao Jie, Jing Zhou, Zengli Peng, Wenxing ZhouAbstract:Offshore pipelines operating in a harsh environment are usually subjected to combinations of Bending moment and axial loadings in addition to internal pressure. Due to the corrosive media transported in the pipelines and corrosive substances within seawater and soil outside the pipelines, local corrosion defects will generate on the pipeline’s inner and outer walls, reducing its ultimate bearing Capacity. This paper presents a series of full-scale failure tests and nonlinear finite element analysis (FEA) to study the Bending Capacity and failure mode of corroded pipelines with outside locally-thinned-areas (LTAs) subjected to combinations of internal pressure, axial compressive force and Bending moment. The LTAs are loaded in compression to simulate corrosion. Material tests of API 5L X56 seamless pipe steel were conducted and the stress-strain relationship was obtained. FEA results of the moment versus curvature relation, Bending Capacity and local buckling behavior of each specimen model matched the experimental results very well, validating the accuracy of this simulation. Additional FEA is then performed to investigate the effect of corrosion geometric parameters, such as corrosion depth, corrosion width, and corrosion length, on the ultimate moment. Among them, the width is of the greatest impact, followed by is the depth, the length impact can be ignored.
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Ultimate Bending Capacity of strain hardening steel pipes
China Ocean Engineering, 2016Co-Authors: Yan Fei Chen, Juan Zhang, Xin Li, Hong Zhang, Jing ZhouAbstract:Based on Hencky’s total strain theory of plasticity, ultimate Bending Capacity of steel pipes can be determined analytically assuming an elastic-linear strain hardening material, the simplified analytical solution is proposed as well. Good agreement is observed when ultimate Bending capacities obtained from analytical solutions are compared with experimental results from full-size tests of steel pipes. Parametric study conducted as part of this paper indicates that the strain hardening effect has significant influence on the ultimate Bending Capacity of steel pipes. It is shown that pipe considering strain hardening yields higher Bending Capacity than that of pipe assumed as elastic-perfectly plastic material. Thus, the ignorance of strain hardening effect, as commonly assumed in current codes, may underestimate the ultimate Bending Capacity of steel pipes. The solutions proposed in this paper are applicable in the design of offshore/onshore steel pipes, supports of offshore platforms and other tubular structural steel members.
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Limit Bending Capacity of Steel Pipes Considering Strain Hardening Effect
ICPTT 2014, 2014Co-Authors: Yan Fei Chen, Hong Zhang, Xuaoben Liu, Duan Qingquan, Jing ZhouAbstract:Based on Hencky's total strain theory of plasticity, the limit Bending Capacity of steel pipes can be determined analytically assuming an elastic-linear strain hardening material. The simplified analytical solution is proposed as well. Good agreement is observed when limit Bending capacities obtained from analytical solutions are compared with experimental results from full-size testing of steel pipes. It is shown that pipe considered to be strain hardening yields a higher Bending Capacity than that of pipe assumed as an elastic-perfectly plastic material. Thus, the ignorance of strain hardening effect, as commonly assumed in current codes, may underestimate the limit Bending Capacity of steel pipes. The solutions proposed in this paper are applicable in the design of offshore and onshore steel pipes, supports of offshore platforms and other tubular structural steel members.
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Residual Bending Capacity for pipelines with corrosion defects
Journal of Loss Prevention in the Process Industries, 2014Co-Authors: Yan Fei Chen, Juan Zhang, Hong Zhang, Xiaoben Liu, Jing ZhouAbstract:Residual Bending Capacity for corroded pipelines in the presence of axial force and internal pressure can be determined analytically assuming a full plastic failure mode for the pipeline. In this paper, a set of closed-form analytical solutions for residual Bending Capacity are developed for pipelines with idealized corrosion geometries, namely, constant-depth, elliptical, and parabolic corrosions. It is shown that pipelines with idealized elliptical or parabolic corrosion yield higher Bending resistance than that of constant-depth, with the difference between elliptical or parabolic corrosion particularly significant for the case of deep and wide corrosion. It is further pointed out that the simplification of the actual corrosion geometry by constant-depth, as commonly assumed in current code assessment of corroded pipelines, will inevitably underestimate the residual strength of the pipe, especially for the case of deep and wide corrosion. Finally, the experimentally measured Bending moment is adopted to validate the proposed analytical solutions in this paper.