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Steel and Composite Structures
  Volume 33, Number 1, October10 2019 , pages 111-122

Post-fire test of precast steel reinforced concrete stub columns under eccentric compression
Yong Yang, Yicong Xue, Yunlong Yu and Zhichao Gong

    This paper presents an experimental work on the post-fire behavior of two kinds of innovative composite stub columns under eccentric compression. The partially precast steel reinforced concrete (PPSRC) column is composed of a precast outer-part cast using steel fiber reinforced reactive powder concrete (RPC) and a cast-in-place inner-part cast using conventional concrete. Based on the PPSRC column, the hollow precast steel reinforced concrete (HPSRC) column has a hollow column core. With the aim to investigate the post-fire performance of these composite columns, six stub column specimens, including three HPSRC stub columns and three PPSRC stub columns, were exposed to the ISO834 standard fire. Then, the cooling specimens and a control specimen unexposed to fire were eccentrically loaded to explore the residual capacity. The test parameters include the section shape, concrete strength of inner-part, eccentricity ratio and heating time. The test results indicated that the precast RPC shell could effectively confine the steel shape and longitudinal reinforcements after fire, and the PPSRC stub columns experienced lower core temperature in fire and exhibited higher post-fire residual strength as compared with the HPSRC stub columns due to the insulating effect of core concrete. The residual capacity increased with the increasing of inner concrete strength and with the decreasing of heating time and load eccentricity. Based on the test results, a FEA model was established to simulate the temperature field of test specimens, and the predicted results agreed well with the test results.
Key Words
    precast steel reinforced concrete columns; reactive powder concrete; fire condition; post-fire residual capacity; eccentric compression
(1) Yong Yang, Yicong Xue, Yunlong Yu, Zhichao Gong:
School of Civil Engineering, Xi'an University of Architecture and Technology, Shaanxi, China;
(2) Yicong Xue:
School of Natural and Built Environment, Queen's University Belfast, Northern Ireland, UK;
(3) Yunlong Yu:
Key Lab of Structural Engineering and Earthquake Resistance, Shaanxi, China.

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