Proposed project is oriented to the problems of load-carrying capacity of steel-concrete members using high-strength steels (HSS) and concretes (HPC) in the case of column buckling. The use of high-strength materials (comparing usual material) goes to the higher load-carrying capacity in the case of pure compression. In the case of buckling it is necessary to investigate optimum relations of parameters, because using HSS and HPC the pure compression load-carrying capacity depends on the strength (if section area is constant) but the buckling load-carrying capacity depends also on the member stiffness (included in slenderness) which is constant (in the case of steel members) or it goes to the higher values very slowly (depending on concrete modulus elasticity in the case of concrete or steel-concrete members). Methods of experimental verification will be used for the solution mainly. Subsequent theoretical analysis is based on the creation of static models and their verification and calibration using parameters obtained experimentally. Results of experimental and theoretical solution methods can be used as the base for more accurate design philosophy in the meaning of specific procedures for the design of steel-concrete composite structures which are given in normative rules, or for innovation of general approaches and conception respecting the special character of investigated structural element, respectively. (en)
Ověření možností použití ocelí a betonů vysokých pevností v ocelobetonových tlačených prutech a zhodnocení vhodnosti a efektivity použití těchto materiálů pro zvýšení únosnosti. Zpřesnění metodiky návrhu s ohledem na specifický charakter konstrukčního prvku daný vlastnostmi speciálního materiálu.