Influence of Cross-Section Shape and FRP Reinforcement Layout on Shear Capacity of Strengthened RC Beams

Ahmed, Muhammad; Colajanni, Piero; Pagnotta, Salvatore

doi:10.3390/ma15134545

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…Design strategies for seismic-resistant buildings and seismic rehabilitation of existing buildings have become one of the most important topics among researchers. Depending on the type of structure different retrofitting techniques, either through a global modification of structural seismic behavior [1], or through simple local interventions [2], were proposed.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Finite Element Analysis of the Cyclic Behaviour of Linear Dissipative Devices

Pagnotta,

Ahmed,

Colajanni

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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In the past years, low-damage design of structures is becoming an efficient approach by engineers and researchers in order to mitigate the structural damage to buildings during a seismic event. To this aim, one of the most popular strategies is to endow framed structures with either viscous, hysteretic metallic, or viscoelastic devices. As an alternative to these systems, friction devices have been also studied, proving to be an effective solution. Steel braces endowed with linear dissipative devices based on friction can be used effectively both in the case of new and existing structures. Studies conducted on these devices stressed that their behaviour is mainly influenced by type of friction materials, loss of bolt preload and effect of disc springs. An experimental campaign has been performed at the Materials and Structures Laboratory of the University of Palermo on linear dissipative devices with different types of friction materials i.e., steel, thermal sprayed aluminium, and brass, to check their effectiveness. Finite element analysis using ABAQUS has been done to design, check the functionality, and get insight into the experimental results of the linear dissipative devices. An investigation has been done on the effectiveness of disc springs to limit the bolt preload variation in the device and the effect of thicknesses of plates on the functionality of linear friction dissipative device. The results showed that thermal sprayed aluminium, coupled with structural steel, is a good friction material as it provides stable hysteresis loops and high friction coefficient as compared to brass, and appropriately designed disc springs are able to limit bolt preload variation. The experimental results showed that the thermal sprayed aluminium provides a friction coefficient between 0.57 and 0.6 without significant variation even for a large number of cycles, while for the brass the friction coefficient at the beginning of the test was 0.25 and then it increased to 0.45 at the end of test, exhibiting large variation due to stick and slip phenomenon. The FEM analysis proved that the disc springs are able to minimize the variation of the contact pressure due to the Poisson effect and proper thickness of friction plates are important for the performance of friction device.

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Section: Introductionmentioning

confidence: 99%

Experimental and Finite Element Analysis of the Cyclic Behaviour of Linear Dissipative Devices

Pagnotta,

Ahmed,

Colajanni

2023

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Shear Behavior of T-Shaped Concrete Beams Reinforced with FRP

Zhang

Wang

et al. 2022

Buildings

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The calculation formula for bearing capacity was verified and further corrected through the current study of the influences of different parameters on the shear behavior of concrete T-beams reinforced with surface-embedded FRP. Tests were conducted on 14 beams reinforced with FRP tendons, including assessments of different concrete strength grades, longitudinal reinforcement ratios, surface characteristics, types, diameters, reinforcement modes, FRP spacings, and specimen shear span ratios. The results show that surface-embedded FRP reinforcement technology can be utilized to improve the overall stiffness and shear strength of beams, delay the development of oblique cracking, reduce the width of diagonal cracking, and improve the bite cooperation between concrete aggregates, thus improving the manifestation of reinforcement. The shear failure mechanism of reinforced concrete beams, strengthened with surface-embedded FRP, seemed to be similar to that of ordinary reinforced concrete beams. The mechanism of action was identical to that of stirrups, and the utilization factor of FRPs was determined.

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Influence of Cross-Section Shape and FRP Reinforcement Layout on Shear Capacity of Strengthened RC Beams

Cited by 2 publications

References 43 publications

Experimental and Finite Element Analysis of the Cyclic Behaviour of Linear Dissipative Devices

Experimental and Finite Element Analysis of the Cyclic Behaviour of Linear Dissipative Devices

Shear Behavior of T-Shaped Concrete Beams Reinforced with FRP

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