Measuring, Monitoring and Modeling Concrete Properties

Abstract

The identification of adequate parameters for Engineering design, as well as their confirmation from in situ measurements, is a relevant problem in Structural Engineering. One strategy usually applied is the inverse analysis of monitoring data from the actual structure. This paper describes the application of an inverse analysis approach to fit theoretical models, available in the literature, for shrinkage and creep, to data acquired in long term tests on concrete specimens performed at the LABEST Laboratory of Concrete Technology and Structural Behavior, Faculdade de Engenharia da Universidade do Porto. The following models were considered in this paper: Eurocode 2, ACI 209R-92, Brazilian Code NBR 6118- 2003, the model B3 by Bazant and Baweja, and the model GL2000 by Gardner and Lockman. A minimization algorithm developed by Hendriks was implemented in MATLAB for estimating parameters corresponding to each model.