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Compression behaviours of CFSTs using stainless-steel tubes at low temperatures
Abstract This paper made pilot studies on behaviours of concrete-filled stub square stainless-steel tubes (CFSSSTs) subjected to low-temperature compression. Firstly, 16 CFSSSTs were tested under low-temperature axial compression. This testing program studied the effects of testing temperature (T) and SS-tube wall thickness (t). The tests showed that local buckling, corner-region splitting fracture, and concrete crushing occurred to CFSSSTs. The compressive load-shortening curves behaved a four-stage manner, which behaved differently from those hollow stainless-steel tubes (HSSTs). Compared with the common concrete-filled steel tube columns, the CFSSSTs exhibit a higher ductility. Studies showed that reducing T improved the compression capacity (P u) but compromised the ductility of CFSSSTs; increasing the t of HSSTs improved the compression behaviour of CFSSSTs; filling concrete to the HSSSTs significantly improved the compression behaviour of CFSSSTs. This study also developed 3D finite element models (FEM) for the CFSSSTs using the low-temperature mechanical properties of both HSSTs and concrete, which accurately predicted compression behaviours of CFSSSTs at low temperatures. Moreover, the prediction equations in different codes were also adopted to predict the low-temperature P u of CFSSSTs. Validations showed that these code equations provided about 15% underestimations on P u, and they were recommended to predict P u of CFSSSTs at low temperatures.
Highlights Arctic low temperatures improve compressive behaviours of concrete-filled square stainless-steel tubes (CFSSSTs). Low temperatures have limited effects on failure modes of CFSSSTs. Low temperatures improve compression capacity, but reduce the ductility of CFSSSTs. Developed FEM predict well low-temperature compressive behaviours of CFSSSTs.
Compression behaviours of CFSTs using stainless-steel tubes at low temperatures
Abstract This paper made pilot studies on behaviours of concrete-filled stub square stainless-steel tubes (CFSSSTs) subjected to low-temperature compression. Firstly, 16 CFSSSTs were tested under low-temperature axial compression. This testing program studied the effects of testing temperature (T) and SS-tube wall thickness (t). The tests showed that local buckling, corner-region splitting fracture, and concrete crushing occurred to CFSSSTs. The compressive load-shortening curves behaved a four-stage manner, which behaved differently from those hollow stainless-steel tubes (HSSTs). Compared with the common concrete-filled steel tube columns, the CFSSSTs exhibit a higher ductility. Studies showed that reducing T improved the compression capacity (P u) but compromised the ductility of CFSSSTs; increasing the t of HSSTs improved the compression behaviour of CFSSSTs; filling concrete to the HSSSTs significantly improved the compression behaviour of CFSSSTs. This study also developed 3D finite element models (FEM) for the CFSSSTs using the low-temperature mechanical properties of both HSSTs and concrete, which accurately predicted compression behaviours of CFSSSTs at low temperatures. Moreover, the prediction equations in different codes were also adopted to predict the low-temperature P u of CFSSSTs. Validations showed that these code equations provided about 15% underestimations on P u, and they were recommended to predict P u of CFSSSTs at low temperatures.
Highlights Arctic low temperatures improve compressive behaviours of concrete-filled square stainless-steel tubes (CFSSSTs). Low temperatures have limited effects on failure modes of CFSSSTs. Low temperatures improve compression capacity, but reduce the ductility of CFSSSTs. Developed FEM predict well low-temperature compressive behaviours of CFSSSTs.
Compression behaviours of CFSTs using stainless-steel tubes at low temperatures
Chen, Minghui (Autor:in) / Yan, Jia-Bao (Autor:in)
11.07.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Behavior of CFSTs and CCFSTs under quasi-static axial compression
| Online Contents | 2013
Behavior of CFSTs and CCFSTs under quasi-static axial compression
| Elsevier | 2013