Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures

Shear failure is a brittle and undesirable mode of failure in reinforced concrete structures. Many of the existing shear design equations for steel fiber reinforced concrete (SFRC) beams include significant uncertainty due to the failure in accurately predicting the true shear capacity. Given these,...

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Main Authors: Oladimeji B. Olalusi, Panagiotis Spyridis
Format: Article
Language:English
Published: MDPI AG 2020-10-01
Series:Applied Sciences
Subjects:
Online Access:https://www.mdpi.com/2076-3417/10/19/6955
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author Oladimeji B. Olalusi
Panagiotis Spyridis
author_facet Oladimeji B. Olalusi
Panagiotis Spyridis
author_sort Oladimeji B. Olalusi
collection DOAJ
description Shear failure is a brittle and undesirable mode of failure in reinforced concrete structures. Many of the existing shear design equations for steel fiber reinforced concrete (SFRC) beams include significant uncertainty due to the failure in accurately predicting the true shear capacity. Given these, adequate quantification and description of model uncertainties considering the systematic variation in the model prediction and measured shear capacity is crucial for reliability-based investigation. Reliability analysis must account for model uncertainties in order to predict the probability of failure under prescribed limit states. This study focuses on the quantification and description of model uncertainty related to the current shear resistance predictive models for SFRC beams without shear reinforcement. The German (DAfStB) model displayed the lowest bias and dispersion, whereas the <i>f</i>ib Model 2010 and the Bernat et al., model displayed the highest bias and dispersion. The inconsistencies observed in the resistance model uncertainties at the variation of shear span to effective depth ratio are a major cause for concern, and differentiation with respect to this parameter is advised. Finally, in line with the EN 1990 semi-probabilistic approach for reliability-based design, the global partial safety factors related to model uncertainties in the shear resistance prediction of SFRC beams are proposed.
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spelling doaj.art-2eabae4253134dd3be372f0f137de0a32023-11-20T16:04:20ZengMDPI AGApplied Sciences2076-34172020-10-011019695510.3390/app10196955Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete StructuresOladimeji B. Olalusi0Panagiotis Spyridis1Structural Engineering & Computational Mechanics Group (SECM), Department of Civil Engineering, University of KwaZulu-Natal, Durban 4041, South AfricaFaculty of Architecture and Civil Engineering, Technical University of Dortmund, 44227 Dortmund, GermanyShear failure is a brittle and undesirable mode of failure in reinforced concrete structures. Many of the existing shear design equations for steel fiber reinforced concrete (SFRC) beams include significant uncertainty due to the failure in accurately predicting the true shear capacity. Given these, adequate quantification and description of model uncertainties considering the systematic variation in the model prediction and measured shear capacity is crucial for reliability-based investigation. Reliability analysis must account for model uncertainties in order to predict the probability of failure under prescribed limit states. This study focuses on the quantification and description of model uncertainty related to the current shear resistance predictive models for SFRC beams without shear reinforcement. The German (DAfStB) model displayed the lowest bias and dispersion, whereas the <i>f</i>ib Model 2010 and the Bernat et al., model displayed the highest bias and dispersion. The inconsistencies observed in the resistance model uncertainties at the variation of shear span to effective depth ratio are a major cause for concern, and differentiation with respect to this parameter is advised. Finally, in line with the EN 1990 semi-probabilistic approach for reliability-based design, the global partial safety factors related to model uncertainties in the shear resistance prediction of SFRC beams are proposed.https://www.mdpi.com/2076-3417/10/19/6955steel fiber reinforced concrete beamshear capacitystructural designmodel uncertaintypartial safety factorsstructural reliability
spellingShingle Oladimeji B. Olalusi
Panagiotis Spyridis
Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures
Applied Sciences
steel fiber reinforced concrete beam
shear capacity
structural design
model uncertainty
partial safety factors
structural reliability
title Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures
title_full Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures
title_fullStr Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures
title_full_unstemmed Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures
title_short Probabilistic Studies on the Shear Strength of Slender Steel Fiber Reinforced Concrete Structures
title_sort probabilistic studies on the shear strength of slender steel fiber reinforced concrete structures
topic steel fiber reinforced concrete beam
shear capacity
structural design
model uncertainty
partial safety factors
structural reliability
url https://www.mdpi.com/2076-3417/10/19/6955
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