Vibration of prestressed beams: Experimental and finite-element analysis of post–tensioned thin-walled box-girders

Bonopera, Marco; Chang, Kuo‐Chun; Tullini, Nerio

doi:10.1016/j.jcsr.2023.107854

Cited by 14 publications

(14 citation statements)

References 44 publications

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“…An FEA method for prestressed beams with external tendons was developed [ 23 ]. The following assumptions are adopted: (1) plane section remaining plane (excluding external tendons due to their unbonded nature [ 24 ]); (2) negligible bond-slip for internal steel bars; (3) negligible shear deformation (given that prestressed concrete beams generally have a high slenderness); (4) negligible frictional loss between external tendons and deviators (this assumption is reasonable in practice but may lead to a bit of an overestimation of the tendon stress). The Euler–Bernoulli beam theory is employed.…”

Section: Materials Methods and Verificationmentioning

confidence: 99%

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Lou

Pang

2023

Materials

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This work assesses the flexural performance of prestressed concrete beams with external carbon fiber-reinforced polymer (CFRP) tendons, focusing on tendon-related variables. A finite element analysis (FEA) method is verified. A numerical parametric analysis of prestressed concrete beams with external CFRP tendons is carried out. Four tendon-related variables are considered, namely, the area, initial prestress, depth and elastic modulus of tendons. The analysis shows that flexural ductility decreases as the tendon area, initial prestress or elastic modulus increases but is insensitive to the tendon depth. The ultimate tendon stress increment (Δσp) is influenced by all of the four variables investigated. JGJ 92-2016 (Chinese technical specification for concrete structures prestressed with unbonded tendons) significantly underestimates Δσp and, hence, is over-conservative for the strength design of these beams. An equation is proposed for calculating Δσp, taking into account all four variables investigated. An analytical model is then developed to estimate the flexural strength (Mu) of prestressed concrete beams with external CFRP tendons. The proposed analytical model shows good agreement with FEA, i.e., the mean discrepancy for Δσp is 0.9% with a standard deviation of 11.1%; and the mean discrepancy for Mu is −1.6% with a standard deviation of 2.1%.

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Section: Materials Methods and Verificationmentioning

confidence: 99%

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Lou

Pang

2023

Materials

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“…Wen-Hwa Wu et al [17] considered the specific arrangement of the boundary constraints of a suspender of an arch bridge and were able to simply determine the tension of the suspender by concentrating multiple measurements at one end. Marco Bonopera et al [18] studied the free transverse vibration of a post-reinforced thin-walled steel box girder and found that the dynamic force of the beam largely depended on the contact between the cable and the surrounding section.…”

Section: Introductionmentioning

confidence: 99%

Research on an Intelligent Identification Method for Cable-Stayed Force with a Damper Based on Microwave Radar Measurements

Li,

Huang,

Ding

et al. 2024

Buildings

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Aiming at the shortcomings of traditional contact cable force monitoring technology in accuracy, efficiency, and applicability, an assessment method based on microwave radar measurements is proposed to measure a sloping cable with a damper for lengths greater than 200 m in this study. A formula for calculating the cable-stayed force with a damper is derived, and an intelligent cable force monitoring platform is developed based on cloud technology. Based on the Chongqing Nanjimen Railway Bridge, a real bridge test was carried out. It was indicated that the microwave radar method could be used to freely adjust the measurement angle and possessed high applicability and penetration. It significantly improved the measurement accuracy and efficiency of cables with a damper for lengths greater than 200 m. It has good application value for the solution of the problems of complicated operation and high costs in the monitoring of cables with a damper. The formula for calculating the cable force with a damper was proven to be reliable and accurate when compared to the results of direct calculation and the equivalent cable length method. It was able to significantly reduce the calculation error of the cable force caused by the influence of the damper. Additionally, the intelligent cable force monitoring platform was utilized to enhance the level of digitization, providing technical support for the scientific management and maintenance of bridges.

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“…Depending on this level, full and partial shear connections can be created. The composite beam capacity can be efficiently increased by external post-tensioning utilizing high-strength steel cables [1]. For elevated levels of prestressing force, the composite member tends to exhibit characteristics resembling a shallow arc with horizontal elastic support, resulting in enhanced flexural behavior.…”

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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Vibration of prestressed beams: Experimental and finite-element analysis of post–tensioned thin-walled box-girders

Cited by 14 publications

References 44 publications

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Effect of Tendon-Related Variables on the Behavior of Externally CFRP Prestressed Concrete Beams

Research on an Intelligent Identification Method for Cable-Stayed Force with a Damper Based on Microwave Radar Measurements

Fatigue Characteristics of Steel–Concrete Composite Beams

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