Comportement des sections composées acier-béton.

Abstract

The aim of this thesis concerns the study of the behavior of steel-concrete composite sections completely embedded in concrete. The beam studied has a characteristic compressive strength of 20MPA, 25MPA and 30MPA. The thesis has two essential phases: theoretical and experimental phases. With regard to the experimental phase we have carried out several tests:  Three compression tests on three cylindrical specimens to obtain a concrete characterized by a compressive strength equal to 2OMPA, 25MPA and 30MPA.  Three bending tests in four points on only three metal profiles to be compared with up beams completely embedded in concrete.  Three bending tests in four points on three metal profiles embedded in the concrete. From these tests we deduce that the concrete embedding the IPE profiles increases the bearing capacity and the load of ruin as well as the flexion rigidity compared to the metal profiles alone.The steps of the theoretical phase can be summed up in three points:  A calculation of the load bearing capacity of the composite beam with EC4 and AISC codes.  A ruin loading calculation according to the EC4 code on the one hand and the AASHTO code on the other hand.  A calculation of the bending deformation of the composite beam from several rigidities. Each rigidity corresponds to one of the following codes: AIJ, EC4, AISC, ACI and BS5400 We conclude that the EC4 code is the most conservative in relation to bearing capacity and the AASHTO code is considered to be the most conservative regarding ruin loading. Nevertheless if we compare the calculation of the bending deformation by the codes we deduce that they invalidate the conservation of the bending deformation.