Fire resistance of circulat steel tubes infilled with ultra-high strength concrete with external fire protection

Authors

  • Xiao Lyu School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China
  • Erfeng Du School of Civil Engineering, Southeast University, Nanjing 210096, China Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China
  • Ran Li School of Civil Engineering, Southeast University, Nanjing 210096, China Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China

Keywords:

finite element analysis, fire protection, fire resistance, circular steel tube, Ultra-high strength concrete

Abstract

In this paper, a non-linear three-dimensional finite element model is presented in order to study the behaviour of axially loaded ultra-high strength concrete filled circular hollow tubular columns exposed to fire. Ultra-high strength concrete with compressive strength greater than 180 N/mm2 has been developed for concrete filled tubes for use in high–rise buildings. This paper studies the structural performance of fire protected ultra-high strength concrete filled tubular columns exposed to the standard ISO fire. The aim of this work is to understand and represent the behaviour of axially loaded ultra-high strength concrete filled circular hollow tubular columns in fire situations and to compare calculation results with experiment. The numerical analyses are carried out using a general finite element analysis package ABAQUS and the results are 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 prediction and load displacement behavior during the fire.

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Published

2019-01-14