Fatigue performance and evaluation of welded joints in steel truss bridges

Cui, Chuang; Zhang, Qinghua; Bao, Yi; Kang, Jiping; Bu, Yizhi

doi:10.1016/j.jcsr.2018.06.014

Cited by 34 publications

(17 citation statements)

References 22 publications

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“…The model can reveal the effects of damage accumulation and the nonlinear constitutive relation of the plasticstage. (5) The damage parameters and model parameters η, ξ, g, h, K' and n' are fitted by the test results.…”

Section: Discussionmentioning

confidence: 99%

“…The stress-strain hysteretic curves obtained from different loading strain amplitudes are placed in the same coordinate system, and the maximum and minimum stress peaks are connected to obtain the cyclic stress-strain curves, just as depicted in Figure 12, which does not represent the true stress-strain path of the welded material under cyclic loading, but is a cyclic stress-strain curve under steady state. Researches [33,60,61] show that the cyclic stress-strain curves of steady-state are different from those under monotonic loading, the cyclic stress-strain curve can be described by the Ramberg-Osgood [43] model approximately, as presented in Equation (5). E 0 and K 0 are the initial elastic modulus and hardening coefficients, respectively, which can be fitted by the Low-cycle fatigue test of the welding materials.…”

Section: Cyclic Stress-strain Curve Based On Ramberg-osgood Modelmentioning

confidence: 99%

“…For example, 48 railway truss bridges were used as case studies by Khademi [2,3] to study hybrid structural analysis and the procedures that were developed to enhance the load rating of railway truss bridges. There are also many other investigations for the behavior of trusses [4][5][6][7][8][9][10][11][12]. Still, the energy dissipation of a steel tubular truss structure depends mainly on the welded joint under earthquake.…”

Section: Introductionmentioning

confidence: 99%

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Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

2018

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The weld form of intersecting joints in a steel tubular truss structure changes with the various intersecting curves. As the key role of joints in energy dissipation and seismic resistance, the weld is easy to damage, as a result the constitutive behavior of the weld is different from that of the base metal. In order to define the cumulative damage characteristic and study the constitutive behavior of welded metal with the influence of damage accumulation, low-cycle fatigue tests were carried out to evaluate overall response characteristics and to quantify variation of cyclic stress amplitude, unloading stiffness and energy dissipation capacity. The results show that the cyclic softening behavior of welding materials is apparent, however, the steel shows hardening behavior with the increase of cyclic cycles, while the cyclic stress amplitude, unloading stiffness, and energy dissipation capacity of the welding materials degenerate gradually. Based on the Ramberg–Osgood model and introducing the damage variable D, a hysteretic model of welding material with the effect of damage accumulation was established, including an initial loading curve, cyclic stress-strain curve, and hysteretic curve model. Further, the evolution equation of D was also built. The parameters reflecting the damage degradation were fitted by the test data, and the simulation results of the model were proved to be in good agreement with the test results.

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Section: Discussionmentioning

confidence: 99%

Section: Cyclic Stress-strain Curve Based On Ramberg-osgood Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

2018

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“…Nevertheless, the local influence of the welded joints on the stress value is disregarded. For the reason of its simplicity, this method is the most widely used approach to design welded structures against fatigue [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Fatigue Life of Welded Joints Made of Fine-Grained Martensite-Bainitic S960QL Steel and Determination of Crack Origins

Ślęzak

2019

Advances in Materials Science and Engineering

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Due to growing requirements connected with the utilization of advanced structures, nowadays the modern design processes are developed. One of the crucial issues considered in these processes is proper design of the joints against fatigue in order to fulfill a stated life of operation. In this study, the method of fatigue life prediction based on the criterion of permissible strain range in the notch root is presented. An engaged simplified model of fatigue life prediction was previously developed for mild and carbon steels. The evaluation made during the research has proven that this method can also be used for S960QL high-strength steel characterized by entirely different properties and structure. A considered theoretical model demonstrates satisfactory correlation with experimental data and safely describes the fatigue life of weldments. Furthermore, the predicted fatigue life of studied steel without welds shows great comparability with experimental data. The limit value of the strain range in the notch root was estimated. Below this value of strain, the fatigue life of welded joints is infinite, theoretically. Finally, the impact of the surface imperfections on the fatigue crack initiation was revealed. For paternal material, the origins of cracking were discovered at the places of nonmetallic scale particles. In welded joints, the fatigue cracks initiated at the whole length of the fusion line.

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“…Also in the case of bridges welded structures we often meet static loads , as well as variable loads that cause fatigue failures [1][2][3][4][5][6][7]. In the case of static loads, things are simpler and clearer in the sense that structural failures occurs when the tear resistance of the base material is exceeded.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Rehabilitation Techniques on Static and Variabile Loads in Case of a HSLA Steel Samples

Babiş¹,

Solomon²,

Iacobescu³

et al. 2018

Preprint

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Abstract:There are many welded structures in the world such as bridges and viaducts that are subject to fatigue. These structures, generally made of non-alloy or low-alloy steels, have been put into operation some of them with many years ago and have accumulated a large number of variable load cycles over the time. For this reason the occurrence of fatigue phenomenon is inevitable and consists in the occurrence of failures at stresses applied to the structure, below the yield limit of the material. These stresses under the static loads would not cause the failures to appear..This paper will investigate whether two reconditioning techniques "weld toe grinding" and "WIG remelting weld toe", influences favorably the behavior of welded structures made from HSLA steel, in static and variable loads and therefore if the application of these techniques is justified in both cases. In the paper will be presented the chemical composition and mechanical properties of the base and filler materials, micro and macrostructures, graphics with the variation of microhardness, static and fatigue tensile tests will be performed, and it will be rised durability curve in case of fatigue tests.

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Fatigue performance and evaluation of welded joints in steel truss bridges

Cited by 34 publications

References 22 publications

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

Study on Hysteresis Model of Welding Material in Unstiffened Welded Joints of Steel Tubular Truss Structure

Prediction of Fatigue Life of Welded Joints Made of Fine-Grained Martensite-Bainitic S960QL Steel and Determination of Crack Origins

The Influence of Rehabilitation Techniques on Static and Variabile Loads in Case of a HSLA Steel Samples

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