Fatigue Characteristics of Steel–Concrete Composite Beams

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...

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Main Authors: Ayman El-Zohairy, Hani Salim, Hesham Shaaban, Mahmoud T. Nawar
Format: Article
Language:English
Published: MDPI AG 2024-02-01
Series:Infrastructures
Subjects:
Online Access:https://www.mdpi.com/2412-3811/9/2/29
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author Ayman El-Zohairy
Hani Salim
Hesham Shaaban
Mahmoud T. Nawar
author_facet Ayman El-Zohairy
Hani Salim
Hesham Shaaban
Mahmoud T. Nawar
author_sort Ayman El-Zohairy
collection DOAJ
description 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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spelling doaj.art-7439e7646c6a477685b464ed566c0bca2024-02-23T15:21:15ZengMDPI AGInfrastructures2412-38112024-02-01922910.3390/infrastructures9020029Fatigue Characteristics of Steel–Concrete Composite BeamsAyman El-Zohairy0Hani Salim1Hesham Shaaban2Mahmoud T. Nawar3Department of Engineering and Technology, Texas A&M University-Commerce, Commerce, TX 75429, USADepartment of Civil and Environmental Engineering, University of Missouri, Columbia, MO 65211-2200, USADepartment of Structural Engineering, Zagazig University, Zagazig 44519, EgyptDepartment of Structural Engineering, Zagazig University, Zagazig 44519, EgyptFatigue 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.https://www.mdpi.com/2412-3811/9/2/29steel beamconcrete slabcomposite beamsfatigue loadingdegree of shear connectionexternal post-tensioning
spellingShingle Ayman El-Zohairy
Hani Salim
Hesham Shaaban
Mahmoud T. Nawar
Fatigue Characteristics of Steel–Concrete Composite Beams
Infrastructures
steel beam
concrete slab
composite beams
fatigue loading
degree of shear connection
external post-tensioning
title Fatigue Characteristics of Steel–Concrete Composite Beams
title_full Fatigue Characteristics of Steel–Concrete Composite Beams
title_fullStr Fatigue Characteristics of Steel–Concrete Composite Beams
title_full_unstemmed Fatigue Characteristics of Steel–Concrete Composite Beams
title_short Fatigue Characteristics of Steel–Concrete Composite Beams
title_sort fatigue characteristics of steel concrete composite beams
topic steel beam
concrete slab
composite beams
fatigue loading
degree of shear connection
external post-tensioning
url https://www.mdpi.com/2412-3811/9/2/29
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AT mahmoudtnawar fatiguecharacteristicsofsteelconcretecompositebeams