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This paper describes an experimental study on the flexural ductility of lightweight-aggregate concrete beams including concretes with compressive strengths between 22.0 and 60.4 MPa and dry densities between 1651 and 1953 kg/m 3 .Nineteen simply supported beams were tested until failure. Two symmetrical concentrated loads were applied at approximately one third of the span. Ductility was studied by defining ductility indexes. The main variables are the concrete compressive strength and the longitudinal tensile reinforcement ratio. It is shown that the parameter with higher influence on ductility is the longitudinal tensile reinforcement ratio. The test results are also compared with the requirements from some codes of practice. It is shown that ACI Code requirements give more guaranties as far as ductility is concerned, when compared with European codes.

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This work describes an experimental study on the plastic rotation capacity of high strength beams. Nine simply supported isostatic beams were tested, by applying comprising two symmetrical concentrated loads at approximately one-third and two-third's span. A method of analysis is defined that leads to the development of a parameter that characterizes the plastic rotation capacity at the failure section by means of a plastic analysis of the tested beams. The influence of concrete strength and the longitudinal tensile reinforcement ratio on the capacity for plastic rotation is examined and discussed. The results are discussed and compared with previous studies. RtSUMt Ce travail ~crit une ~tude expMmentale sur la capacit~ de rotation plastique de poutres en b~ton h haute r&istance. Neuf poutres isostatiques ont ~t~ test&s avec une charge constitue'e par deux forces concentr&s et sym&iques situ&s environ au tiers et aux deux tiers de la port&. Une m~thode d'analyse est d~finie, conduisant au d&eloppernent cl'un paramktre qui caractMse la capacit~ de rotation plastique de la section de rupture, utilisant une analyse plastique des poutres test&s. L'influence de la r&istance du b~ton et du taux d'armatures longitudinales de traction sur la capacitO de rotation plastique est examin& et discut&. Les r&ultats sont analys&, discut& et compar& avec des ~tudes antMeures.

Construction using refurbished shipping containers is a recent building system, with already many successful examples around the world. This system presents a huge potential in the field of sustainable construction provided by the recycling of used containers. This paper aims to contribute to a better knowledge of this construction system in what concerns to the structural project. The general constitution of two maritime shipping containers is presented as well as some aspects of their structural behavior. For this purpose, numerical analyses were performed using a finite elements analysis program. Normative aspects for the structural project are also presented. This paper also presents the analysis of a case study with the use of refurbished shipping containers to build a single-family house. The evaluation of the strength of the refurbished shipping containers to building actions is carried out. It is shown that such evaluation is not easy because some mechanical parameters of noncommercial steel section of the elements that compose the shipping containers are unknown. Nevertheless, this study shows the feasibility of this building system.

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