Axial compressive behaviour of CFDST stub columns with large void ratio

Axial compressive behaviour of rectangular DCFSST stub columns

“…13 and 16, it can be observed that, the inner steel tubes of the rectangular DCFSST stub columns under axial compression generally reach their yielding state while the axial capacity achieved, which is consistent with the previous findings [6,20]. As a result, the yield strength of the inner steel tubes can be directly subtracted from the axial capacity of new composite columns to assess the influence of parameters on the strength of the outer tube and the sandwiched concrete, and the strength index (𝑓 scy,d ) of the rectangular DCFSST stub columns under axial compression is defined as follows:…”

“…Referring to the approach in Yang et al (2021) [20], axial compression stiffness (𝐾 e ) of the rectangular DCFSST stub columns is defined as follows:…”

“…In the FE modelling, the approach for determing the weighted-average yield strength and the corner radius of the cold-formed steel RHS as well as SHSs in [23] and [24] was employed, respectively. In addition, for the inner steel CHSs, the true stress versus plastic strain relationship was acquired by transforming the 𝜎 𝑠 − 𝜀 𝑠 relationship including five segments in [20],…”

Numerical analysis on torsional behavior of rectangular and square CFDST members

“…İpek et al [31] developed numerical models to study the failure mode of elliptical CFDST members and investigated the influence of key parameters such as material strength and aspect ratio on the ultimate axial strength of elliptical CFDST members. Yang et al [32] conducted test investigation and numerical analyses on the compression behavior of CFDST members with large hollow ratios, the results show that these members possess good structural performance. Fang et al [33] and Su et al [34] fabricated novel CFDST members by using corrugated steel tubes and tested the axial bearing capacity of these members.…”