Experimental behaviour of concrete-filled steel tubes under cyclic axial compression

Abstract

This study experimentally investigated the behaviour of concrete-filled steel tubes under cyclic axial compression. A total of 42 concrete-filled steel tube specimens of two groups were tested to failure. In each group, 18 specimens were subjected to three cyclic axial loading histories while three specimens were subjected to monotonic loading for comparison. The results indicated that concrete-filled steel tube specimens under cyclic axial compression failed in the form of buckling and still kept their form which was similar to the failure of specimens under monotonic loading. Effect of cyclic axial loading slightly reduced (approximately 2%–3%) the maximum stress but it increased 25% of the strain corresponding to the maximum stress. Loading and unloading moduli in post-peak stress phase were, respectively, about 70% and 85% higher than initial moduli because better interaction and confinement were resulted from the initial loading cycle. In addition, the absorbed energy exhibited a heavy dependence on strain and confinement while it was insignificantly affected by cyclic loading histories. Details and application of obtained experimental results are reported in this article.

Behaviour of concrete-Filled steel tube having granulated blast furnace slag as fine aggregate in normal strength concrete after exposure to elevated temperature

“…This confinement was able to eliminate the negative effect of the volumetric instability of slag concrete (Yu et al, 2016). The composite action between steel and concrete of CFST showed improved load carrying capacity and ductility properties compared to conventional reinforced concrete columns (Cao et al, 2020; Ci et al, 2022) and it also helps in minimizing construction costs by reducing the use of formwork (Gupta et al, 2007; Han, 2002; Nematzadeh et al, 2017; Wenchao et al, 2018). Researchers had also studied the effect of stress path dependance on the performance of CFST specimens (Ho et al, 2020; Lai et al, 2020a; Lai et al, 2020b).…”

Seismic performance of concrete-filled steel tube columns using ultra-high-strength steel under long-period ground motion demands

“…Elchalakani et al (2004) tested CFT beam members until fracture under cyclic pure bending with a constant amplitude and compared the peak flexural strength between monotonic and cyclic loading cases. Cao et al (2019) tested 42 CFT columns under axial loading and compared the responses under monotonic loading and cyclic loading with a large number of loading cycles. Their results suggested that the force–displacement relationship was practically identical until the maximum strength.…”

Numerical Study of Circular Concrete Filled Steel Tubes Subjected to Pure Torsion

“…There are tremendous studies conducted on CFST subjected to different loading types e.g. compression [2][3][4], tension [5,6], cyclic loading [7,8], impact [9,10], etc. Different cross sections of CFSTs have been investigated [11].…”

“…Different cross sections of CFSTs have been investigated [11]. Diverse materials have been used to fabricate CFSTs, such as normal/high strength steel [12,13] or stainless steel [14,15]; concrete made of recycled aggregate [3,16,17] or dune sand [18]; and normal [7] or high [2,[19][20][21] strength concrete. To improve the efficiency of CFST, different stiffeners can be employed as reviewed by Alatshan et al [22].…”