Experimental investigation and numerical simulation on welding residual stress of innovative double-side welded rib-to-deck joints of orthotropic steel decks

Zhang, Qinghua; Ma, Yan; Cui, Chuang; Chai, Xiang-yu; Han, Sang Yun

doi:10.1016/j.jcsr.2021.106544

Cited by 39 publications

(20 citation statements)

References 34 publications

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“…The temperature distribution across the L-beam during subsequent cooling was calculated by means of the nonlinear transient heat transfer equation [21,22]:…”

Section: Model Description 31 Thermal Analysismentioning

confidence: 99%

Numerical simulation and experimental investigation of bending deformation mechanism during post-rolling air cooling of AH36 L-beam

Zhao

et al. 2022

Int J Adv Manuf Technol

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L-beam is a widely used structural steel. The study of the three-stage bending deformation mechanism of L-beam under non-uniform cooling conditions is of great significance to ensure the quality, improve the yield of steel and reduce the stress level in the finished L-beam. However, it is difficult to investigate experimentally due to the high temperature and simultaneous changes of various influencing factors during the air-cooling process of the L-beam. Numerical simulation provides a convenient and feasible method to study the bending deformation mechanism of the L-beam. In order to investigate the effects of phase transformation and cooling shrinkage on the bending deformation of AH36 L-beam, a three-dimensional thermalmetallurgical-mechanical coupling model was established in this study, the microstructure distribution, hardness，strain, deformation status and stress during the air-cooling of L-beam were calculated. The results show that the microstructure distribution and deformation condition calculated by the model considering the phase transformation effect better agree with the actual situation. Considering the phase change effect is the key to improving the accuracy of the model calculation. The change of heat transfer coefficient caused by phase transformation affects the deformation tendency of the L-beam, while the transformation strain affects the amount of deformation of the L-beam. The alternating changes in the sum of the transformation strain and the cooling shrinkage strain result in a change of stress state which ultimately also results in a three-stage bending deformation of the L-beam.

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“…The temperature distribution across the L-beam during subsequent cooling was calculated by means of the nonlinear transient heat transfer equation [21,22]:…”

Section: Model Description 31 Thermal Analysismentioning

confidence: 99%

Numerical simulation and experimental investigation of bending deformation mechanism during post-rolling air cooling of AH36 L-beam

Zhao

et al. 2022

Int J Adv Manuf Technol

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“…Although the calculation result is consistent with the experimental measurement result, their actual working condition has a great difference from construction site. Although finite element welding simulation has been performed on different materials [20][21][22][23] and different joint types [24][25][26][27], some important welding parameters from structural optimization (e.g., the length of welding seam) and welding process (e.g., welding voltage) were less considered in the numerical simulation process, especially for the welding seam longer than the effective length. Just as this study, the welding seam of the rod support was much longer in the QTZ100 (H6013) flat-top tower crane.…”

Section: State Of the Artmentioning

confidence: 99%

Control of Welding Residual Stress and Deformation for the Rod Support of a Crane

Zhou¹,

Zhu²,

Sun³

et al. 2022

Int. j. simul. model.

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The counter jib and rod support are the main stress-bearing parts of crane due to large load. But the long weld seams of their joints produce great residual stress and deformation affecting the welding strength. In order to reduce the residual stress and the deformation simultaneously, an optimal welding procedure was proposed considering the effective length of welding seam. Firstly, a theoretic model of welding seam was built as T-joint of Q355 steel. The accuracy of model was verified by the welding experiments. By numerical simulation, the appropriate welding process parameters were obtained. Four welding procedures were designed to investigate the influence of the welding sequence. Results show that the welding sequence has a great influence on residual stress and deformation of the long welding seam. The welding quality can be improved by segmented welding and simultaneous welding. The optimized welding procedure of long welding seam can reduce the residual stress by 8.04 % and the maximum deformation by 74.1 % considering welding sequence. Therefore, it is recommended in the actual welding process of crane.

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“…To enhance the fatigue resistance of RTD joints, a new double-side welded RTD joint has been applied in real bridges [3][4] [5]. Compared with the common one-side and partial penetration welded RTD joints, the innovative double-side welded can add welded area of joints, reduce welded defects, avoid stress concentration and cut down out-of-plane deformation [6]. Thus, it can improve fatigue strength of RTD welded joints.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al [11] investigated the WRS distribution of hybrid steel U-ribs stiffened plates by the blind hole method and cutting method. Zhang et al [6] studied the longitudinal and transverse WRS distribution on both surfaces and decks and U-ribs. Of the limited WRS measurement on OSDs reported in the literatures, only a few have been conducted in an innovative double-side welded RTD joints, especially for the magnitude and distribution of transverse WRS.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Residual Stress Distribution and Relaxation Effect at Double-Side Welded Rib-to-Deck Joints of Orthotropic Steel Decks

2022

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The welding residual stresses (WRS) will shorten the fatigue resistance of rib-to-deck (RTD) joints of orthotropic steel decks (OSDs) in bridge engineering. It is essential to obtain WRS and its distribution to accurately assess the fatigue damage of RTD joints in OSDs subjected to vehicle loads. Initial WRS will release under cyclic loading, resulting in the redistribution of WRS in steel bridges. To estimate the relaxation of initial transverse WRS, experimental investigations on WRS distribution in initial state and its relaxation law under cyclic loading were conducted of the double-side welded RTD joints using ultrasonic Non-destructive Testing. The results indicate that the initial transverse WRS at the heat affected zone of both inside and outside of decks vary from 0.50fy to 0.83fy, and transform within the range of 0.27fy~0.43fy at both inside and outside surfaces of U-ribs. WRS relaxation is prone to be activated under cyclic loading, especially at the first cycles. Afterwards, the WRS proceed with relaxation at a lower rate, remaining almost stable with more repetitions of loading.

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Experimental investigation and numerical simulation on welding residual stress of innovative double-side welded rib-to-deck joints of orthotropic steel decks

Cited by 39 publications

References 34 publications

Numerical simulation and experimental investigation of bending deformation mechanism during post-rolling air cooling of AH36 L-beam

Numerical simulation and experimental investigation of bending deformation mechanism during post-rolling air cooling of AH36 L-beam

Control of Welding Residual Stress and Deformation for the Rod Support of a Crane

Experimental Investigation on Residual Stress Distribution and Relaxation Effect at Double-Side Welded Rib-to-Deck Joints of Orthotropic Steel Decks

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