Abstract
Composite columns and beams are a combination of concrete and steel elements realising the advantages of both types of materials. According to codes for concrete‐filled column, the plastic resistance of the cross‐section is given as a sum of the components and taking into account the effect of confinement in case of circular sections. In this study the stress state in composite column is determined taking into account non‐linear relationship of the modulus of elasticity and Poisson's ratio on the stress level in the concrete core. It has been determined that the effect of confinement occurs at a high stress level when structural steel acts in tension and concrete works in lateral compression. The stress state and load bearing capacity of section in bending is determined taking into account non‐linear dependence on position of neutral axis. Because the ultimate limit state of material is not attained for all the parts simultaneously, to improve the stress state of a composite element and to prevent the possibility of a failure the appropriate strength of concrete and steel should be used. The safety of high-stressed composite structures can be achieved by using ultra‐high‐performance concrete (UHPC).
Highlights
Composite columns and beams, formed as hollow steel sections filled with concrete, have advantages in different architectural and structural solutions
The composite structure characterises with higher ductility than the concrete column and advantages of steel may be successfully used in connections
Using concrete of the strength class C35/45 and steel of grade .e235 the load-bearing capacity of the composite column increases by 18 % in comparison with concrete class C30/37. .or a thin wall hollow section (d/t = 90) instead of section with d/t = 46 the steel economy is 50 %
Summary
Composite columns and beams, formed as hollow steel sections filled with concrete, have advantages in different architectural and structural solutions. Concrete filling and reinforcing bars increase rigidity and load-bearing capacity of the hollow steel section with no changing in external dimensions of column. A radial pressure develops at the steel-concrete interface thereby restraining the concrete core and setting up a hoop tension in the tube. At this stage, the concrete core is stressed triaxially and the steel tube biaxially. In this study stress analysis of the composite column and beam is performed with the purpose to obtain the maximum value of load-bearing capacity and enhance the safety of the structure using components with the appropriate strength properties and taking into account the composite action. The effect of UHPC on the stress state and load-carrying capacity of composite elements is analysed
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