Gintas Šaučiuvėnas

The behavior of cold formed steel structure connections

AbstractNowadays, there is a growing tendency in the use of cold formed constructions, which may be explained by good strength to cost ratio. Thus, the goal of this paper is to review the behaviour of cold formed steel connection. The article reviews most up to date publications on testing and description of beam-tobeam, beam-to-column and truss connections. In brief, the properties of cold formed steel connections have been found to be semi rigid, where the main factor affecting stiffness is bearing forces around the bolthole. The article also focuses on the technique to increase stiffness of cold formed connections.

Design of circular composite beams with a different concrete core considering the effect of concrete in tension

AbstractCurrently, the bending resistance of composite steel and concrete circular beams and beam-columns may be analysed assuming the interaction between the steel shell and concrete core but ignoring the behaviour of the part of the concrete core in tension. Some natural and numerical experiments show that an influence of this part of the concrete core on the total value of bending resistance of a composite member may be rather important. Therefore, this paper pre- sents the method developed for the design of hollow and solid concrete-filled steel tubular beams based on the test data. It takes into account an effect of the part of the concrete core in tension and gives a better agreement with test results than EC4 (EN 1994-1-1 2004). Also, the paper presents the results of carried out analytical, experimental and numerical investigations of the hollow centrifuged and solid concrete-filled steel tubular beams.

Bearing Capacity of Axially Loaded Timber Members – Estimation Under Uneven Fire Action

Abstract The article deals with the peculiarities of calculating bearing capacity for axially loaded timber members under uneven fire action. According to LST EN 1995-1-2 and finite element modelling for determining temperature fields and variations in timber strength under elevated temperature, the method of simple calculations was applied. Calculations are based on the data and results of experimental investigations into the resistance of axially loaded members to fire. Data on variations in timber strength were obtained conducting laboratory tests using the specimens of Lithuanian pine under elevated temperature.

General buckling analysis of steel built-up columns using finite element modelling

Abstract The paper investigates the general buckling of an axially loaded column using the finite element method with different slenderness ratios of axes x-x and z-z. The paper deals with three different modes of buckling. The conducted numerical experiments have suggested correction factors and appropriate buckling modes of the built-up columns. The obtained modelling results were compared with data on analytical calculations made according to Lithuanian national codes STR and Eurocode 3. The FEM analysis of the builtup column has showed that both codes (STR and EC3) are giving safe enough results for a considered type of conditions for column support.