Closing the gap between concrete maturity monitoring and nonlinear time-dependent fem analysis through a digital twin. Case study: post-tensioned concrete slab of an office building, Barcelona, Spain

Abstract

This paper proposes a pipeline for the automation of data between two realms: i) simulation, in a fully nonlinear, and time-dependent structural analysis model and, ii)concrete maturity monitoring data from the construction site. The connection enables an information construct understood for its use within the Digital Twin of the building during construction phases. The pipeline requires a comprehensive coordination between stakeholders at both the site (Construction) and the structural control office, which is challenging. The pipeline consists of a) temperature sensors, b) a mobile app connected to the sensor via Bluetooth with basic instructions for datagatherers, c) integration and interoperability of BIM, and, d) an advanced Finite Element (FE) model. By measuring the concrete temperature during many days, realistic concrete mechanical properties are inferred and infused into the FE models using adequate calibration. Two applications for the improvement of construction activities are identified. Formwork striking and tendons stressing. The paper describes the testbed of all the connections, for the construction of an in-situ casted concrete building in Barcelona, Spain.