Parameters Effect on Predicting Fire Resistance of Ultra-high Strength Concrete Filled Protected Square Steel Tubular Co
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International Journal of Steel Structures (2020) 20(5):1783–1795 https://doi.org/10.1007/s13296-020-00410-9
Parameters Effect on Predicting Fire Resistance of Ultra‑high Strength Concrete Filled Protected Square Steel Tubular Columns Xiao Lyu1,2 · Gan‑Ping Shu3,4 · Er‑Feng Du3,4 Received: 1 July 2017 / Accepted: 8 September 2020 / Published online: 14 September 2020 © Korean Society of Steel Construction 2020
Abstract Ultra-high strength concrete (UHSC) with compressive strength greater than 100 MPa at room temperature has been developed for concrete filled square steel tubular column for use in high-rise buildings. The fire resistance of UHSC filled protected square steel tubular columns exposed to the standard ISO fire is investigated in this paper. For this purpose, numerical heat transfer analysis and nonlinear thermal stress analysis were conducted by taking into account the existing material properties, such as the thermal and mechanical properties of UHSC and high strength steel. The numerical analyses were carried out and the results were validated against the test results in terms of heat distribution and mechanical behavior. Comparison with the test results showed a reasonable agreement with finite element results in terms of temperature field prediction and load displacement behavior during the fire. Finally, based on the validated finite element model, the effects of fire protection thickness, load ratio, the strengths of concrete and steel, steel contribution ratio, and relative slenderness ratio on the fire resistance of UHSC filled square steel tubular columns were carried out and discussed. Keywords Thermal analysis · Constant axial load · Fire resistance · Protected square steel tubular column · Ultra-high strength concrete · Mechanical properties
1 Introduction The use of composite construction has become more widespread in recent decades. Depending on several advantages such as high load-bearing capacity, inherent ductility and toughness, concrete-filled steel tubular columns are commonly used in high-rise buildings and bridges. The main benefit of using concrete filled tubular columns is the increase of load bearing capacity without the need of additional formwork. Their fire resistance can also be further enhanced with infilled concrete (Chung et al. 2009; Rush * Gan‑Ping Shu [email protected] 1
School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China
2
Key Laboratory of Building Structural Retrofitting and Underground Space Engineering (Shandong Jianzhu University), Ministry of Education, Jinan 250101, China
3
School of Civil Engineering, Southeast University, Nanjing 210096, China
4
Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China
et al. 2012; Shu and Lv 2013). This is likely due to the fact that concrete core traps the heat inside the steel tube. In other words, the concrete core acts as heat sink which reduces the temperature of the steel tube when the concrete filled steel tube is subjected
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