Fatigue performance of stud shear connectors in steel-concrete composite beam with initial damage

Lu, Kaiwei; Du, Linpu; Xu, Qizhi; Yao, Yiming; Wang, Jingquan

doi:10.1016/j.engstruct.2022.115381

Cited by 14 publications

(2 citation statements)

References 12 publications

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“…Additionally, the number of cycles results in a quick rise in the residual deformations of the composite beams at the beginning and end of the fatigue life, but a linear increase throughout the remainder of the fatigue life [6]. According to the test results, concrete cracks have little effect on fatigue life, but stud damage has a significant impact [7]. Compared to static qualities, the stud's damage had a bigger impact on fatigue performances.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Characteristics of Steel–Concrete Composite Beams

El-Zohairy,

Salim,

Shaaban

et al. 2024

Infrastructures

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Fatigue in steel–concrete composite beams can result from cyclic loading, causing stress fluctuations that may lead to cumulative damage and eventual failure over an extended period. In this paper, the experimental findings from fatigue loading tests on composite beams with various arrangements are presented. Fatigue tests were performed up to 1,000,000 cycles using four-point loading, encompassing various ranges of shear stress at a consistent amplitude. Additionally, the effects of external post-tensioning and the strength of the shear connection were investigated. Static tests were run until failure to assess the enduring strength of the specimens subjected to fatigue. The cyclic mid-span deflections, slippages, and strains were measured during the testing. Based on the experimental findings, it was found that the damage region that the shear studs caused in the concrete slab, which resulted in a reduction in stiffness within the shear connection, grew as the loading cycles increased, leading to an increase in residual deflections and plastic slippages. Controlling the longitudinal fatigue cracks in the concrete slab was largely dependent on the strength of the shear connection between the steel beams and concrete slabs. Moreover, the applied fatigue loading range affected the propagation and distribution of fatigue cracks in the concrete slab. The strains in different parts of the composite specimens were significantly reduced by applying the external post-tensioning. With no signs of distress at the anchors, the tendons displayed excellent fatigue performance.

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Section: Introductionmentioning

confidence: 99%

Fatigue Characteristics of Steel–Concrete Composite Beams

El-Zohairy,

Salim,

Shaaban

et al. 2024

Infrastructures

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“…Steel-UHPC composite bridge decks have been widely applied in bridge engineering in recent years [1][2][3][4][5]. The UHPC structural layer can significantly improve the overall stiffness of steel bridge decks while ensuring their lightweight and high-strength advantages, thereby effectively improving the fatigue performance of the steel bridge deck [6,7].…”

Section: Introductionmentioning

confidence: 99%

Study of Fatigue Performance of Ultra-Short Stud Connectors in Ultra-High Performance Concrete

An,

Wang,

Zhuang

et al. 2024

Buildings

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Steel–UHPC composite bridge decking made of ultra-high performance concrete (UHPC) has been progressively employed to reinforce historic steel bridges. The coordinated force and deformation between the steel deck and UHPC are therefore greatly influenced by the shear stud connectors at the shear interface. Four fatigue push-out specimens of ultra-short studs with an aspect ratio of 1.84 in UHPC were examined to investigate the fatigue properties of ultra-short studs with an aspect ratio below 2.0 utilized in UHPC reinforcing aged steel bridges. The test results indicated that three failure modes—fracture surface at stud shank, fracture surface at steel flange, and fracture surface at stud cap—were noted for ultra-short studs in UHPC under various load ranges. The fatigue life decreased from 1287.3 × 104 to 24.4 × 104 as the shear stress range of the stud increased from 88.2 MPa to 158.8 MPa. The UHPC can ensure that the failure mode of the specimens was stud shank failure. Based on the test and literature results, a fatigue strength design S–N curve for short studs in UHPC was proposed, and calculation models for stiffness degradation and plastic slip accumulation of short studs in UHPC were established. The employment of ultra-short studs in the field of UHPC reinforcing aging steel bridges can be supported by the research findings.

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Shear behavior of stud and SFCBs‐reinforced PBL composite connectors in steel‐concrete structures

Wu,

Zhao,

Liu

et al. 2024

Structural Concrete

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In order to fully utilize the advantages of stud and perfobond leiste (PBL) connectors, a new composite shear connector was proposed in which the studs were welded to the H‐beam of the PBL shear connectors. In addition, to further improve the durability performance of the structure, steel‐fiber‐reinforced polymer composite bars (SFCBs) were used to replace steel rebars as penetrating rebars. In this study, the shear behaviors of SFCBs‐reinforced composite shear connectors were investigated by push‐out tests. The effects of the number of studs, the number of holes, and the type of penetrating rebars on the failure mode, load–slip curve, and shear behavior of the composite shear connectors were analyzed. The specimens' failure modes were mainly shearing the studs and crushing the concrete. Increasing the number of studs and holes has resulted in an increase of at least 7.47% in the shear resistance and 12.36% in the stiffness. SFCB had little effect on the shear resistance and reduced the stiffness but could improve ductility, with a maximum improvement of 11.49%. Additionally, a finite element model was established for parametric analysis. The results showed that the diameter of the SFCB and hole had a significant impact on the shear resistance. An equation for calculating the shear resistance based on the contributions of various components has been established that was applicable to composite shear connectors and has good accuracy and applicability.

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Fatigue performance of stud shear connectors in steel-concrete composite beam with initial damage

Cited by 14 publications

References 12 publications

Fatigue Characteristics of Steel–Concrete Composite Beams

Fatigue Characteristics of Steel–Concrete Composite Beams

Study of Fatigue Performance of Ultra-Short Stud Connectors in Ultra-High Performance Concrete

Shear behavior of stud and SFCBs‐reinforced PBL composite connectors in steel‐concrete structures

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