Abstract
This article describes a study on the plastic behaviour of lightweight-aggregate concrete beams. The experimental results of nineteen simply supported beams previously tested by the authors were used in this study. The experimental plastic rotation capacity of the tested beams was characterized by a parameter called Plastic Trend Parameter (PTP). The main variables studied were the concrete compressive strength and the longitudinal tensile reinforcement ratio. It was found that plastic rotation capacity slightly increases as the concrete compressive strength increases. An appropriate range for the longitudinal tensile reinforcement ratio to ensure plastic rotation capacity is proposed. The results of this study were also compared with the requirements from some codes of practice. From this analysis, it was shown that ACI Code requirements give more guaranties as far as plastic rotation capacity is concerned, when compared with European codes. First published online: 28 Jan 2016
Highlights
The evolution of the chemical admixtures and minerals has evolved in the last decades
Plastic Trend Parameter (PTP) was considered sufficiently reliable to be used in the present study to characterize the plastic rotation capacity of the tested lightweight aggregate concretes (LWAC) beams under flexure
For approximately constant values of concrete compressive strength, the plastic rotation capacity of the beams decreases as the longitudinal reinforcement ratio increases
Summary
The evolution of the chemical admixtures and minerals has evolved in the last decades For this reason, lightweight aggregate concretes (LWAC) have seen successive improvements in terms of workability, durability and compressive strength. Advantages exist in using concretes with higher compressive strengths and, simultaneously, lighter weights. This is because self-weight can represent a very large percentage of the total load. It was shown that tensile/ compressive strength ratio and fracture toughness are lower (Domagala 2011; Cui et al 2012) This results in higher brittleness of the concrete (Jung et al 2007)
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