Abstract
The objective of this research is to study the effects of residual stresses and cold-straightening on the compressive resistance of solid round steel columns. Thermal residual stresses in selected solid round sizes were determined from experimental study, finite element analysis, and previous research. In the experimental investigation, classical boring-out method using water-jet technology was applied on four samples with different diameters. Finite element models were constructed for the determination of thermal reidual stresses for columns with 12 different diameters. The results were then compared with results obtained from a recent study on the predictionof symmetrical residual stresses in solid rounds using X-ray diffraction method. For the non-symmetrical residual stresses arising from cold-straightening, the equation developed by Nitta and Thurlimann was adopted in the finite element modeling to study the effect of non-symmetrical residual stresses on the compressive resistance of solid round steel columns. The Finite Element Analysis has been conducted on different bar diameter (1.5 inch to 12 inch diameter) and length, as well as initial out-of-straightness.
Highlights
Antenna towers are used throughout the world by the communications and other industries
In the fmite element modeling, 324 models were constructed for postbuckling analysis of columns with symmetrical residual stress with which 324 ultimate compression resistance values were obtained from the load history curves
Experimental investigations on the residual stresses were carried out using boring-out method
Summary
Antenna towers are used throughout the world by the communications and other industries. Selfsupporting towers are supported entirely by the tower structure and a solid cement or concrete base. They are usually with heights up to 120m. Bracketed and guyed towers use either brackets or guy wires attached to adjacent buildings or anchors in order to provide support to the tower. Such type of antenna towers can be as high as up to 620 m. Rigid tube towers make use of a "lattice-style" rigid tube structure to provide internal support in a cross-bracing pattetn for the entire height of the tower. Rigid tube tower structures are popular for low sodium lighting installed at outdoor sporting fields and stadiums, and guyed or rigid tube construction is a popular method for remote installation of wind turbines or other alternative energy systems
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