Modelagem computacional de painéis constituídos de concreto leve e de concreto reforçado por tecido submetidos a cargas térmicas

Abstract

The search for optimized materials for civil construction has become increasingly urgent in response to current social, economic, and environmental demands. Concrete, as one of the most widely used materials in this sector, has been the focus of numerous studies aimed at enhancing its properties through innovative composition and combination approaches. In this context, sandwich panels made of lightweight concrete and textilereinforced concrete (TRC) have emerged as promising solutions for building enclosures. Their application leads to a reduction in the self-weight of structures and improvements in thermal and acoustic performance, ultimately resulting in decreased material consumption. However, the behavior of these panels under thermal loading remains insufficiently studied, even though such conditions significantly alter the thermal and mechanical properties of the materials by modifying their internal structure and composition. Therefore, it is essential to evaluate the performance of these systems and quantify the new values of their properties as the structural temperature rises, in order to predict their behavior and ensure user safety. This study aims to develop a computational model capable of simulating the behavior of lightweight concrete and TRC under high-temperature conditions. Initially, a thermal analysis is conducted to determine the temperature field across the panels, accounting for the temperature-dependent properties of the materials. Subsequently, a mechanical model is used to evaluate the resulting stress and strain distributions and to identify any damage sustained by the structure. Finally, the model’s representativeness is assessed by comparing the simulation results to laboratory test scenarios of such panels. The results obtained from the developed models satisfactorily capture the behavior of these systems, serving as a valuable initial reference for future research on the topic.