Resumo

GONZALEZ CUEVAS, Óscar M.  e  ARTEAGA ANGELES, Julio M.. Comportamiento de extremos recortados de trabes presforzadas. Concr. cem. investig. desarro [online]. 2011, vol.2, n.2, pp.18-34. ISSN 2007-3011.

The strut-and-tie method is an useful tool to design concrete elements which have stress concentrations or abrupt changes in its cross section. Reinforced or prestressed concrete beams with dapped ends are example of these elements in which both conditions appear. This paper discusses the applicability of this method to prestressed concrete beams with dapped ends, of which there is little experimental information. To this end, a laboratory model that represents the dapped ends of an AASHTO type beam has been developed by means of the strut-and-tie method; it has been tested in order to analyze their behavior in terms of strength, cracking, and stresses in the struts and ties that constitute the models. Two different models proposed by AASHTO were designed and tested. In both cases the measured strengths were similar to the theoretical strengths and the cracking patterns defined similar trusses to the ones proposed in the model which was the basis of the design. One of the models had a better behavior on the width of the cracks caused by service loads. It was concluded that the strut-and-tie method is advisable for designing this type of beam.

Palavras-chave : Prestressed concrete; dapped ends; strut-and-tie; tests.

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