Crack width model for thick reinforced concrete plates subjected to in-plane forces

Abstract

An extensive experimental program is conducted in the present study to investigate the cracking behavior of two normal strength concrete plates and thirteen high strength concrete plates. The results raise questions about the applicability of the present code approaches to predict the crack width of thick concrete plates used for offshore structures and containment structures for nuclear power plants. The main objective is to provide a simple equation for crack width prediction of a concrete plate to ensure the control of crack openings in designing thick high strength reinforced concrete structures. The model predictions are compared with the results of the tests of reinforced concrete panels subjected to in-plane tension forces along with the code approaches for predicting the crack width.Résumé : Un vaste programme expérimental est réalisé dans la présente étude afin d'examiner le comportement en fissuration de deux plaques de béton à résistance normale et de treize plaques de béton à haute résistance. Les résultats soulèvent des questions quant à l'applicabilité des approches du code actuel pour prédire la largeur des fissures dans des plaques de béton épaisses utilisées dans les constructions en mer et les structures de confinement des centrales nucléaires. L'objectif principal est de fournir une équation simple pour prédire la largeur des fissures d'une plaque de béton afin d'assurer le contrôle des ouvertures de fissures lors de la conception de structures épaisses en béton armé à haute résistance. Les prévi-sions du modèle sont comparées aux résultats des essais de panneaux en béton armé soumis à des forces de tension en plan selon les approches du code pour prédire la largeur des fissures.Mots-clés : largeur de fissures, espacement des fissures, plaques épaisses de béton armé à haute résistance, constructions en mer, confinement nucléaire, charge en plan.[Traduit par la Rédaction]

Structural Health Monitoring of the Rebecca Street (William Anderson) Bridge

“…The validity of code prescribed crack width and spacing computations have been studied extensively, and it has been found that code based computations can be modified for thick structural members, like the piers of the Rebecca Street Bridge. Thus, the Crack Width Model (Dawood and Marzouk, 2011) and Neural Analysis (Elshafey et al, 2013) will be utilized to compute the crack width and spacing respectively. In addition, the dynamic modulus of elasticity is computed using the shear wave velocities obtained for the piers and abutments during the scanning phase and are transformed into dynamic modulus of elasticity values using adopted models (Popovics et al, 2008;Birgul, 2009).…”

“…Extensive research has been done in this field to attempt to study the cracking behavior of flexural reinforced concrete members (Clark, 1956;Frantz and Breen, 1980;Hwan and Jin, 1987;Frosch, 2002). A model for predicting the crack width along the length of the crack was adopted (Dawood and Marzouk, 2011). Therefore, the profile of the cracking opening along the length of the primary cracks can be developed.…”

“…The model was validated by comparing test results with computed values based on the developed model for the crack width, as well as the available code approaches for estimating the value of the crack width (Dawood and Marzouk, 2011). Based on the analytical investigation, the following design equation was adopted to evaluate the crack width (w x ):…”

“…However, prior to undertaking any maintenance actions, the pier should be scanned at higher elevations in order to analyze the overall structural condition of the member. The crack width, spacing and modulus of elasticity of the piers and abutments were calculated using the adopted models (Dawood and Marzouk, 2011;Elshafey et al, 2013;Popovics et al, 2008;Birgul, 2009). The reinforcement detailing provided by the Town of Oakville was used to calculate the crack width and spacing of the pier columns and the obtained S-wave and P-wave velocities from shear wave tomography and impact-echo were used to calculate the in-place modulus of elasticity.…”

Centriškai tempiamųjų armuoto betono elementų įtempių ir deformacijų būvio analizė

“…Bandymų ypatumas -tempimo apkrova elementams buvo perduodama "per betoną": bandymų schema ir daviklių išdėstymas parodytas 1.25 paveiksle. Dawood & Marzouk (2011) atliko plonų plokščių, tempiamųju dviem kryptimis, bandymus. Sukurta unikali bandymų įranga, leidžianti apkrauti elementus dviem ortogonaliomis kryptimis.…”