Experiment-based reliability analysis of structural joints in a steel lattice tower

Szafran, Jacek; Juszczyk, Klaudia; Kamiński, Marcin

doi:10.1016/j.jcsr.2018.11.006

Cited by 31 publications

(18 citation statements)

References 26 publications

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“…Since the heat treatment is conducted in laboratory conditions and due to the limited number of specimens, it is unscientific to establish the relationship between the nonlinear parameter and the performance degradation of the TP 304 stainless steel in its whole life cycle [20]. However, we can still obtain some basic findings from these experimental results.…”

Section: Relationship Between the Microstructural Evolution And Nonlimentioning

confidence: 99%

Characterizing Microstructural Evolution of TP304 Stainless Steel Using a Pulse-Echo Nonlinear Method

Liu

Zhang

et al. 2020

Materials

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Tube/Pipe (TP) 304 stainless steel has been widely used in industry, but a change in its microstructures may endanger its service safety, and it is essential to evaluate its microstructural evolution. In this work, a pulse-echo nonlinear method is proposed to characterize the microstructural evolution of the TP304 stainless steel. The detailed pulse-echo nonlinear experimental process is presented, and it is shown that the absolute nonlinear parameter can be determined when the effect of attenuation is taken into account. The microstructural evolution of TP304 stainless steel is artificially controlled by annealing treatments before it is evaluated by using nonlinear ultrasonic method and metallographic method. The results show that the grain sizes increase as the annealing time increases, which leads to the performance degradation of the TP304 steel and an increase in the nonlinear parameters, with the reason discussed considering the variation in the microstructure. The present pulse-echo nonlinear method is easier to conduct than the traditional transmission-through method and the absolute nonlinear parameter can be determined for quantitative characterization. The variation in determined nonlinear parameters provides a reference to evaluate the microstructural evolution of TP304 stainless steel.Materials 2020, 13, 1395 2 of 11 dislocations, precipitates, and fatigue microcracks [6]. Therefore, nonlinear acoustic testing can be used to characterize the degradation of the microstructural properties of TP 304 stainless steel components.When a monochromic ultrasonic wave is transmitted in a material, the waveform is distorted by the nonlinear elastic property of the material and harmonic waves are generated [7]. The nonlinear ultrasonic method often measures these harmonic waves to obtain the relative or absolute nonlinear parameter to evaluate the microstructural evolution of materials. The typical method uses longitudinal waves and is usually conducted in through-transmission mode, which requires access to both sides; however, this technique may be restrictive in a field measurement scenario where, for example, access is only possible to the outer surface of a pipeline [8]. The pulse-echo method, which enables single-side access to the test component using a nonlinear longitudinal wave, provides a useful tool for practical applications of nonlinear ultrasonic measurement.Determining the absolute nonlinear parameter is important in order to quantitatively evaluate the microstructural evolution of materials [9]. Measuring nonlinear parameters for fluids using the pulse-echo method with a rigid boundary has been reported [10]. For solid materials or structures, the stress-free boundary will destructively alter the nonlinear wave generation process. Some researchers have shown that the 'residual' nonlinear wave reflected from stress-free boundaries can still be measured [8,11]. However, there are some difficulties in determining the absolute nonlinear parameters of TP 304 stainless steel using the pulse-echo method...

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Section: Relationship Between the Microstructural Evolution And Nonlimentioning

confidence: 99%

Characterizing Microstructural Evolution of TP304 Stainless Steel Using a Pulse-Echo Nonlinear Method

Liu

Zhang

et al. 2020

Materials

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“…Gordziej-Zagórowska et al [ 24 ] determined the deformation forms and strains in the case of a truss system composed of bars with an open cross-section. The experiment-based reliability of multi-bolted structural connections in a steel lattice tower has been analysed by Szafran [ 25 ] and Szafran et al [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies of an Asymmetric Multi-Bolted Connection under Monotonic Loads

2021

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This article describes the experimental studies of a preloaded asymmetric multi-bolted connection in the exploitation state. The construction of two stands were introduced: for bolt calibration and for evaluating the bolt forces in a multi-bolted connection. The bolts were tightened in a specific optimal sequence, in three passes, monitoring the force values in the bolts using a calibrated strain gauge measuring system. The studies were conducted for the selected multi-bolted connection on an Instron 8850 testing machine. The measurement data were saved in MATLAB R2018b Simulink. The measurement results were analysed statistically and are presented via charts showing the distributions of the normalised values of the bolt forces as a function of the linearly increasing and decreasing exploitation loads. We show that the forces in individual bolts, after unloading the multi-bolted connection, change in relation to the initial values of their preload.

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“…Balagopal et al [23] proposed a simplified bolted connection model considering axial stiffness and rotational stiffness, and deduced the rotational stiffness formula of slip due to eccentric load transfer in angle steel section bolted connection. Szafran et al [24] presented a reliability evaluation method of steel lattice communication tower based on the reliability of tensioning node through test and numerical simulation. Souza et al [25] evaluated the reliability of the transmission tower structure considering the mechanical model uncertainty caused by the connection details.…”

Section: Introductionmentioning

confidence: 99%

Influence of Double-Limb Double-Plate Connection on Stable Bearing Capacity of Quadrilateral Transmission Tower

Zhao

Yan

et al. 2021

Applied Sciences

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Transmission tower connection joint is an important connection component of the tower leg member and diagonal member. Its axial stiffness directly affects the stable bearing capacity of a transmission tower. The axial stiffness of the joint is mainly related to the connection form of joint. This paper takes the double-limb double-plate connection joint as the research object. Through the comparative study with the single-limb single-plate connection joint, the influence law of single-limb single-plate and double-limb double-plate joint on stable bearing capacity of quadrilateral transmission tower is studied from three aspects of model test, theoretical analysis and numerical simulation. Through the scale model test, it is found that the elastic stiffness of the double-limb double-plate joint is 3.12 times that of the single-limb single-plate joint, which can increase the bearing capacity of the joint by 26.1%. Through the energy method, the theoretical calculation expression of the stable bearing capacity of the quadrilateral tower considering the influence of the axial stiffness of the joint is derived. Compared with the effect of the single-limb single-plate connection joint, the double-limb double-plate joint can improve the stable bearing capacity of the quadrilateral tower by 15.6%. Considering the influence of geometric nonlinearity of tower and connecting joint, it is found that the double-limb double-plate connecting joint can improve the nonlinear stability bearing capacity of a transmission tower by 14.9%. The results show that the double-limb double-plate connection joint can not only improve the bearing capacity of the joint, but also greatly improve the stable bearing capacity of the tower. The research results can provide reference for the engineering application and design of double-limb double-plate connection joints.

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Experiment-based reliability analysis of structural joints in a steel lattice tower

Cited by 31 publications

References 26 publications

Characterizing Microstructural Evolution of TP304 Stainless Steel Using a Pulse-Echo Nonlinear Method

Characterizing Microstructural Evolution of TP304 Stainless Steel Using a Pulse-Echo Nonlinear Method

Experimental Studies of an Asymmetric Multi-Bolted Connection under Monotonic Loads

Influence of Double-Limb Double-Plate Connection on Stable Bearing Capacity of Quadrilateral Transmission Tower

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