Behaviour Of Double Tube Columns Filled Withdifferent Types Of Concrete

Abstract

The composite steel-concrete structure has gained popularity as a contemporary construction solution with its enhanced strength, rapid construction, and light weight. Nevertheless, the concrete-filled double steel skin tube section (CFDSTS) columns suffer from corrosion under severe environments, particularly for offshore oil platforms. Consequently, a concrete-filled double circular tube section (CFDTS) model was developed an outer Glass FRP tube, an inner steel tube.so compressive strength of various materials employed for concrete filling of hollow sections, i.e., normal concrete, special concrete where fine aggregates were partially replaced by ferro-chrome slag, and fiber-reinforced special concrete with crimped steel fibers, was tested through the research work. The findings indicated that both special and fiber-reinforced special concrete exhibited much higher compressive strengths compared to the normal concrete.

The research moreover explored compressive loads of various types of CFDTS columns at 28 days of curing.

The findings indicated that Type 1 CFDTS column recorded the highest compressive strength in comparison to Type 2 and Type 3 columns. The research found that the results add to the existing literature in the area and can guide future studies and innovation of more efficient and sustainable products. The CFDTS model with external FRP confinement is a viable option for new construction in rust-corrosive areas, as it gives lateral confinement, formwork, and an impermeable barrier against rust-promoting elements.