Fluência em concretos de ultra-alto desempenho: modelos de previsão e simulação computacional

Abstract

Advances in the research of cementitious materials field have guided the development of Ultra- igh Performance Concrete (UHPC). In Brazil there are no standards defining UHPC. This study understands UHPC as concretes with a very dense microstructure, great durability, high workability and very high compressive strength. In this work, a literature review of UHPC creep prediction models was conducted, where international recommendations were identified such as AFGC/SETRA (2013), JSCE (2006) and Australia (GOWRIPALAN e GILBERT, 2000); as well as the implementation of the AFGC/SETRA (2013) model, using Abaqus® structural analysis software. In the development it was identified limitations for the implementation of models like fib MC2010 and NBR 6118. The created numerical models results exhibited a good adherence to the creep model and a satisfactory creep coefficient and specific creep were obtained. However, it was observed that the creep coefficients obtained in the created numerical models were inferior to the suggestions of the international recommendations for UHPC with heat treatment.