Study of recycled concrete–filled steel tubular columns on the compressive capacity and fire resistance

Abstract

This study presents the analytical formulation of circular steel tubular column with hollow concrete section. This unified analytical formulation can evaluate the axial compression capacity and buckling load of this innovative composite section at normal and high temperature levels, as well as the normal and recycled concrete in a similar fashion. Therefore, the confinement effect on this composite section is uncertain, which in turn leads to complications in axially loaded compression evaluation, because the inner surface of the hollow concrete section is unrestrained. To this end, this study adopts the effective constraint, which can further assist in transmitting from normal concrete to recycled concrete material to address sustainability issues. In addition, the concept of average temperature is proposed to formulate the failure load of circular hollow recycled concrete-filled steel tubular section and circular hollow concrete-filled steel tubular section columns at high temperature.

A review on utilization of different concretes as in-filled steel hollow column subjected to fire loading

“…Similarly, using NC with recycle aggregate shows that fire resistance of RCFST is extended by about 14% compared to CFHS as the time taken for RCFHS and CFHS to fail are 42 and 49 min, respectively (Wang et al, 2017a). The weakness of Rb-CFHS is during cooling process as the load capacity drops about 17.5% compared to NCFHS, which undergoes 7.6% reduction.…”

“…External fire curve is mainly used for structural member in a façade member to the main member, whereas hydrocarbon fire curve is normally for a situation where petrochemical and plastic form significant part of fire event (Espinos et al, 2011;Yang et al, 2013). ISO 834 has mostly been used across the globe and the standard fire time-temperature curve given in different code is shown in Figure 3 (Espinos et al, 2015b;Shekastehband et al, 2017;Wang et al, 2017a;Siti Nurul Nureda et al, 2017;Neville, 2012).…”

“…Concrete-filled tube, as called CFHS column, is a combination of concrete mixture and hollow steel section acting as one structural element known as composite structural element. This element has gained more widespread usage as load-bearing constituents in construction industry all over the world because of the benefits offered in terms of mechanical behavior and constructional properties as compared to plain concrete (PC) or steel hollow section (Muhammad Faisal et al, 2017;Espinos et al, 2015a;Espinos et al, 2015b;Wan et al, 2017;Shekastehband et al, 2017;Wang et al, 2017a;Du et al, 2017;Lie and Chabot, 1992).…”

Análise do comportamento à flexão de vigas de aço parcialmente revestidas com concreto produzido a partir do uso de agregados reciclados em situação de incêndio

“…Os poucos trabalhos que abordam as estruturas mistas produzidas com CCAR em situação de incêndio, basicamente, estudam o comportamento de pilares tubulares de aço preenchidos com concreto, como por exemplo, Yang e Hou (2012), Liu et al (2017) e Wang et al (2017), o que evidencia a escassez de pesquisas voltadas às vigas mistas com CCAR, fato este pontuado por Pan et al (2022), sobretudo para as VMPR.…”