Sainte-Foy-lès-Lyon, France
Sainte-Foy-lès-Lyon, France

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Houhou N.,University Paris Est Creteil | Benzarti K.,University Paris Est Creteil | Quiertant M.,University Paris Est Creteil | Chataigner S.,University Paris Est Creteil | And 2 more authors.
Journal of Adhesion Science and Technology | Year: 2014

This paper investigates the creep behavior of adhesively bonded concrete/fiber-reinforced polymer (FRP) joints, through experimental and modeling approaches. The first part proposes a methodology for predicting the long-term creep response of the bulk epoxy adhesive; such a procedure consists of (1) performing short-term tensile creep experiments at various temperatures and stress levels, (2) building the creep compliance master curves according to the time-temperature superposition principle in order to assess the long-term evolution for each stress level, and (3) developing a rheological model whose parameters are identified by fitting the previous master curves. In our case, it was found that master curves (and, consequently, parameters of the rheological model) are dependent on the applied stress level, highlighting the nonlinear creep behavior of the bulk epoxy adhesive. Therefore, evolution laws of the model parameters were established to account for this stress dependence. The second part focuses on the creep response of the concrete/FRP assembly in the framework of a double lap joint shear test configuration. Experiments showed that creep of the adhesive layer leads to a progressive evolution of the strain profile along the lap joint, after only one month of sustained load at 30% of the ultimate strength. Besides, a finite element approach involving the abovementioned rheological model was used to predict the nonlinear creep behavior of the bonded assembly. It confirmed that creep modifies the stress distribution along the lap joint, especially the stress value at the loaded end, and leads to a slight increase in the effective load transfer length. This result is of paramount interest since the transfer length is a key parameter in the design of FRP-bonded strengthening systems. Moreover, instantaneous and long-term calculated strain profiles were found in fair agreement with experimental data, validating the modeling approach. © 2012 © 2012 Taylor & Francis.

Yazoghli-Marzouk O.,Departement Laboratoire DAutun | Haussard S.,Departement Laboratoire DAutun
Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures - Proceedings of the 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013 | Year: 2013

Road infrastructures are affected by climate change. The variation of temperature and the modification of rainfall constitute stress that affected structural durability of bituminous pavements. In this paper, the vulnerability of road infrastructures to climate change was treated as a risk management question. The vulnerability is traduced in physical and socio-economical weakness points. The risk is a function of climate parameters and sensitivity of constitutive elements of the road to those parameters. The methodology used is "Top-Down" method. The scenario used in this evaluation is A2. The considered climate parameters are temperature and rainfall. Physical and socio-economic impacts are based on experience feedback and bibliography research. The results show that there are various curative and preventive adaptation methods to climate change. A graphical analysis which superposes geographical zones, climatic zones and structuring roads may help the operator of transport network to select the priority sections. © 2013 Taylor & Francis Group, London.

Germain D.,CETE de Lyon | Aubagnac C.,Departement Laboratoire dAutun | Cannard H.,Departement Laboratoire dAutun
Revue des Composites et des Materiaux Avances | Year: 2012

This article presents a case study focusing on the strengthening of a French road bridge by externally bonded FRP composites. The bridge under study is a viaduct made of pre-stressed concrete girders located near Toutry in Burgundy (France) on the A6 highway. It reports the work conducted by the technical staff of the CETE de Lyon (Engineering Centre of the French Ministry of Sustainable Developments), who were involved in the inspection of the construction site. During this mission, loading tests were performed in order to evaluate the effectiveness of the bridge strengthening. Strain and deflection measurements were compared to a numerical modelling of the structure. It was found that deflections of several beams of the loaded bridge were strongly reduced after the installation of composite reinforcements, much beyond the estimations provided by the model. © 2012 Lavoisier.

Chataigner S.,LUNAM University | Saussol J.-L.,Departement Laboratoire dAutun | Derobert X.,LUNAM University | Villain G.,LUNAM University | Aubagnac C.,Departement Laboratoire dAutun
European Journal of Environmental and Civil Engineering | Year: 2015

In order that non-destructive testing methods become quantitative tools for structure owners, it is necessary to assess their precision and sensitivity to the environment. The presented study deals with two electromagnetic methods classically used to survey road pavements and concrete structures: a radar technique and a capacitive technique. The presented investigations aim at assessing the influence of temperature and moisture on the two methods for measurements realised on concrete slabs. The temperature was ranging from 5 to 45 °C and the surrounding relative humidity (RH) evolved between 60 and 90%. The study is part of a more ambitious topic aiming at defining quantitative non-destructive methods to evaluate the water content of concrete structures on site and their state of degradation. The presented work allows assessing the sensitivity of both radar and capacitive techniques to the environmental conditions: temperature and RH. Moreover, the measurement variability of the used capacitive probes with three different sets of electrodes is estimated. © 2014 Taylor & Francis.

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