Experimental study on the shear behavior of friction connections with corrosion damage

Jiang, Chao; Xiong, Wen; Cai, Chongyan; Zhu, Yanjie; Liu, Zhongxiang

doi:10.1016/j.jcsr.2022.107449

Cited by 13 publications

(5 citation statements)

References 30 publications

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“…Так, авторы трудов [3,4] оценили влияние степени коррозионного износа элементов на несущую способность соединения. Выполнены исследования по определению влияния температуры [5], повторной нагрузки [6,7], сейсмических колебаний [8], способа обработки соединяемых поверхностей [9][10][11], технологии и качества подготовки контактных поверхностей [12] на несущую способность соединения.…”

Section: Introductionunclassified

“…Thus, the authors of works [3,4] evaluated the influence of the degree of corrosion wear of elements on the bearing capacity of the connection. Studies have been carried out to determine the influence of temperature [5], repeated loading [6,7], seismic vibrations [8], the method of treatment of the surfaces to be joined [9][10][11], the technology and quality of preparation of contact surfaces [12] on the bearing capacity of the connection.…”

Section: Introductionmentioning

confidence: 99%

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Размер Площадки Трения Фрикционного Болтового Соединения

Василькин,

Зубков,

Прокаев

et al. 2024

(Stroitel stvo nauka i obrazovanie [Construction Science and Ed

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АННОТАЦИЯВведение. В нормативной методике расчета соединений стальных элементов на высокопрочных болтах основное влияние на несущую способность соединения оказывает усилие натяжения болта и коэффициент трения, при этом ширина соединяемых пластин не учитывается, нормами регламентируется шаг расстановки болтов. Поставлена задача определения влияния ширины стальных пластин на несущую способность соединения пакета. Для этого изготовлено несколько стыковых соединений пластин с двусторонними накладками из горячекатаной стали марки Ст3сп5 по ГОСТ 19903-2015. Одна из стыкуемых пластин изготовлена различной ширины и крепится одним болтом так, чтобы в этом сечении произошло исчерпание несущей способности. После чего соединение растягивается и доводится до предельного состояния на разрывной машине. Материалы и методы. Выполнено шесть комплектов фрикционного соединения с двусторонней накладкой на высокопрочных болтах с различной шириной исследуемой стыкуемой пластины -50; 60; 70; 80; 90; 100 мм. Пластины соединены высокопрочным болтокомплектом класса прочности 10.9 размера М14. Поверхность пластин обработана пескоструйной обработкой. Для выявления усилия сдвига пакета использовалась разрывная машина Instron 1000HDX. Результаты. Определена несущая способность соединений с различной шириной стыкуемых пластин, выполнено сравнение полученных результатов с расчетными теоретическими значениями несущей способности, установлены форма и размер площадки трения. Три образца были доведены до разрушения, выявлено, что разрушение происходит в результате исчерпания прочности пластин на растяжение, а также выкола пластины в результате смятия соединяемых элементов. Выводы. Установлено, что размер зоны трения составляет 2,1-2,3 диаметра отверстия, несущая способность соединения не зависит от ширины элементов.

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Section: Introductionunclassified

Section: Introductionmentioning

confidence: 99%

Размер Площадки Трения Фрикционного Болтового Соединения

Василькин,

Зубков,

Прокаев

et al. 2024

(Stroitel stvo nauka i obrazovanie [Construction Science and Ed

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“…Compared with other parts of the steel bridge, FHSB connection nodes are more prone to corrosion and deterioration, which is mainly reflected in their own structural characteristics and the role of surrounding corrosive media [4][5][6][7][8].Because of the frequent gaps between the FHSB connectors of the steel bridge, water and gas containing corrosive ions are easy to invade the node components and cause corrosion. Due to the concealment of FHSB joint diseases and the complexity of removing the joint, the analysis of corroded joint components is mainly based on indoor test.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Corrosion Products of Friction-type High-Strength Bolted Joints of Steel Bridge: A Case Study

Xu¹,

Xu²,

Xu³

et al. 2023

Preprint

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This paper analyzed the main diseases of the friction high-strength bolt (FHSB) joints in order to study the characteristics of the corrosion products of the joints in steel bridge and the influence factors. Seven representative FHSB connection pairs and eight steel plate samples were selected from the Dongying Shengli Yellow River Bridge, which has been in operation for 33 years. Then Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and X-Ray Diffraction (XRD) were used to analyze the microscopic morphology and chemical composition of the corroded surface of the samples. Finally, this paper discussed the relationship between the corroded sample surface and the environmental corrosion. The research results showed that construction quality problems, such as non-standard hole expansion, segmental slab joint dislocation and contact surface pollution, accelerated corrosion of the contact surface. With the increase of corrosion degree of joints, the contact surface of aluminum spraying layer gradually changed from a rugged and dense state to a smooth and porous powder state. With the corrosion of the steel plate substrate, the contact surface gradually changed from a fluffy stratified state to a surface bonding state. It was inferred that the friction coefficient of the FHSB connection node on the corroded aluminum sprayed contact surface first decreased and then increased. The corroded node samples detected not only a large number of S and Cl elements, but also the oxides of Mn, Si and other elements as well as FeS. It was speculated that node corrosion was also related to atmospheric (acid rain) and industrial dust and other corrosive environments. Almost all samples detected the component SiO2 of the Yellow River soil, as well as Mg, Ca, K, Na and other elements at the same time, which is basically consistent with the component elements of the Yellow River soil. Therefore, it was inferred that it was related to the inclusion of the Yellow River soil.

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“…In [5] the effect of corrosion on the bearing capacity was evaluated, and the effects of temperature [6], repeated loading [7], seismic vibrations [8], the method of treatment of the surfaces being joined [9][10][11] were also investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the tightening coefficient of bolts according to the din standard

Vasilkin,

Akhmetzyanov,

Zubkov

et al. 2023

E3S Web of Conf.

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The use of slip-critical connections is very common in the design of critical steel structures and is seen as an effective way to transfer the force in conditions of dynamic loading. The limit state of the connection occurs when the calculated shear stress is reached, which depends on the friction coefficient of the contact planes and the value of the clamping force, equal to the bolt tension stress. In order to ensure the necessary bolt tensioning force, it is necessary to know the bolt tightening coefficient, because according to the current understanding of the slip-critical connection performance, the designed functioning of the bolt connection is ensured when the bolt tensioning force arising at the necessary torque value is achieved. Otherwise, the actual work of the connection will be different from the calculated, because only a given tension force provides the estimated bearing capacity of the bolted connection with friction planes. This article focuses on tensile testing of a bolt and determining the tightening factor of a bolt made of high-strength10.9 M14 steel. The tightening factor is determined with strain gauges by measuring the relative strain of the bolt when the nut is tightened. This method requires specialized equipment and a test bench and can be used in the study of bolt performance in the absence of a certificate or the need to verify or clarify the available data. The results show that the proposed method can provide a stable determination of the coefficient value. The examined bolts were made according to the German standard DIN931, strength 10.9 size M14x220, nuts according to the German standard DIN934, strength 10 size M14. An Instron 1000HDX tensile testing machine was used to plot the performance of the bolt steel. Nut tension control was determined with the use of NOGRAU NTW24-034R torque wrench, and bolt elongation control with FLA 5-11 strain gauges and National Instruments data acquisition system. On the basis of the conducted research, a method for determining the tightening factor of high-strength bolts has been tested and proposed. The proposed method of determining the tightening factor of a high-strength bolt can be used in research work and allows to determine the coefficient in the absence of an appropriate certificate or the need to clarify (verify) the stated value of the coefficient.

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Experimental study on the shear behavior of friction connections with corrosion damage

Cited by 13 publications

References 30 publications

Размер Площадки Трения Фрикционного Болтового Соединения

Размер Площадки Трения Фрикционного Болтового Соединения

Characteristics of Corrosion Products of Friction-type High-Strength Bolted Joints of Steel Bridge: A Case Study

Experimental determination of the tightening coefficient of bolts according to the din standard

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