Abstract
This article presents an experimental study on the evolution of the neutral axis depth at failure in the critical section with the flexural ductility and plastic rotation capacity of reinforced concrete (RC) lightweight-aggregate concrete (LWAC) beams. For this, the results of a previous experimental program involving RC LWAC beams tested in flexure until failure are used. The variable studies were the concrete compressive strength (between 22.0 and 60.4 MPa and dry density between 1651 and 1953 kg/m3) and the longitudinal tensile reinforcement ratio (between 0.13% and 2.69%). The flexural ductility and the plastic rotation capacity of the RC LWAC beams are characterized by a ductility index and a plastic trend parameter, respectively. The influence of the variable studies, as well as the relation of the flexural ductility and plastic rotation capacity with the values for the neutral axis depth at failure are analyzed and discussed. Some conclusions are drawn which can be useful for the design of RC LWAC beams for flexure. In particular, it is shown that the practical rule of limiting the neutral axis depth at failure to ensure ductile behavior, as used in normal-weight aggregate concrete beams, is also valid for RC LWAC beams.
Highlights
During the last few decades, lightweight-aggregate concretes (LWAC) have deeply improved due to the evolution of the chemical admixtures and minerals
It was found that the evolution of the neutral axis depth for reinforced concrete (RC) LWAC beams as the load increases is identical to the same reported and accepted for RC normal-weight aggregate concrete (NWAC) beams
This seems to indicate that the behavior of the formation and opening of the cracks for RC NWAC is valid for RC LWAC; It was found that both the flexural ductility and plastic rotation capacity of the RC LWAC
Summary
During the last few decades, lightweight-aggregate concretes (LWAC) have deeply improved due to the evolution of the chemical admixtures and minerals. In order to continue this important work, in this article the authors aim, for the longitudinal tensile reinforcement ratio to ensure ductility and plastic behavior, were pointed in particular, to continue check if the practical of limiting the neutral depth in failure at out. In order to this important work, in rule this article the authors aim,axis in particular, to check the critical sections, which is accepted and used nowadays for RC. Is accepted and used nowadays for RC NWAC beams, is valid for RC LWAC beams
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