doi:10.3850/978-981-08-9247-0_rp034-icsas11

ABSTRACT

The paper deals with the actual behaviour and load-carrying capacity of steel-concrete composite structural members composed of high-strength steels and concretes, especially in the comparison with steel-concrete members composed of normal-strength materials. The analysis of the load-carrying capacity (respectively of the resistance) is directed towards the following types of steel-concrete composite members: (i) columns with the cross-section consisting of steel hollow circular section filled by concrete or of steel open H-section with the encasement between flanges, and (ii) beams with the typical cross-section consisting of steel IPE-section and concrete slab. The investigations of the actual behaviour of these steel-concrete composite structural members are based mainly on the experimental verification of the failure mechanisms and objective ultimate load-carrying capacities and on the subsequent evaluation of the results obtained from the tests and their generalization. Within the framework of the experimental research programme oriented to the effective usage of high-strength materials in the composite steel-concrete structures the loading tests of the specimens with cross-section configurations accordant with the members mentioned above were realized for the several combinations of the material (steel and concrete) properties (yield strength from 275 to 460 MPa, concrete cube strength from 20 to 100 MPa). The attention was mainly paid to the determination and evaluation of the load-carrying capacity of these structural members, i.e. columns and beams composed of high-strength steels and concretes, respecting the effective material usage and taking into account also other influences, which are significant for the resulting load-carrying capacity (column buckling, for example).

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