Concrete filled tube (CFT) columns have been used as primary axial load-carrying members in high-rise building especially in seismic zones. The structural member has become popular as it has a number of distinct advantages over an equivalent steel, reinforced concrete, or steel-reinforce concrete structural member. This paper is intended to presents numerical modeling of elliptical concrete-fil...

Experimental and numerical investigations on the retrofitting of half-scale wall-like reinforced concrete (RC) columns were conducted. The axial compressive behavior control un-strengthened RC column (having a section aspect ratio four) was compared with strengthened columns. by employing external confinement through fiber-reinforced polymer (FRP) wraps and/or steel/FRP strips with/without modi...

In modern offshore installations, thin walled columns are used for energy absorption in accident situation. When this advanced offshore shock absorber is subjected to axial compressive load, plastic hinges are developed on the sides of column and the column crushes with repeatable patterns. It can absorb considerable impact energy due to large and continuous plastic deformation. This paper deve...

The search for methods that provide savings greatly drives the alternatives when it comes to cost reduction. obsession with aesthetics and cheaper civil construction, can lead unexpected dangerous results. reduction of dimensions columns be done consciously, always keeping in mind compliance normative standards combined structural optimization. objective this work was evaluate efforts resulting...

Based on tests on six L-shaped RC columns with 500 MPa steel bars, the effect of axial compression ratios and stirrup spacing on failure mode, bearing capacity, displacement, and curvature ductility of the specimens is investigated. Test results show that specimens with lower axial load and large stirrup characteristic value (larger than about 0.35) are better at ductility and seismic performan...

Concrete-filled steel tubular (CFST) columns are composite sections that may contribute to reduce the environmental impact in construction through a more efficient use of resources. By embedding profile inside CFST section, new typology is generated, so-called steel-reinforced concrete-filled (SR-CFST) columns, which enhance not only structural capacity these at room temperature but also their ...

The concept of cold-formed light steel framing construction has been widespread after understanding its structural characteristics with massive research works over the years. Connection serves as one of the important elements for light steel framing in order to achieve its structural stability. Compared to hot-rolled steel sections, cold-formed steel connections perform dissimilarity due to the...

We present the first, complete 230 GHz feedhorn array manufactured by direct drilling of smooth–walled horns into a single plate of aluminium. The horn design process, based on a genetic algorithm, is described and the fabrication process, via direct drilling using shaped drill bits, is presented. We present cross coupling and beam pattern measurements of a close–packed pair of the smooth–walle...

This study proposes a design procedure for the local buckling strength prediction of cold-formed steel (CFS) built-up I and box section columns based on Effective Width Method (EWM) Direct Strength (DSM). For this, ultimate sections made two plain unlipped channels is obtained using finite element (FE) analysis. First, some compression tests are performed to validate FE models. Then, detailed p...