|Table of Contents|

Experimental Research on Rehabilitation with CFRP Sheets for ReinforcedConcrete Columns After Exposure to Fire(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2011年04期
Page:
48-54
Research Field:
Publishing date:
2011-12-20

Info

Title:
Experimental Research on Rehabilitation with CFRP Sheets for ReinforcedConcrete Columns After Exposure to Fire
Author(s):
LI Jun-hua;  YU Chang-hai;  TANG Yue-feng;  LIU Ming-zhe;  XIAO Han
School of Civil Engineering and Environment, Ningbo University, Ningbo 315211, Zhejiang, China
Keywords:
fire;  carbon fiber reinforced polymer sheet;  rehabilitation;  reinforced concrete column;  mechanical behavior;  load bearing capacity
PACS:
TU375.3
DOI:
-
Abstract:
By tests on three reinforced concrete columns repaired by carbon fiber reinforced polymer (CFRP)sheets after exposure to ISO 834 standard fire and three reinforced concrete columns without being repaired after exposure to ISO 834 standard fire as well as three reinforced concrete columns without exposure to fire, the rehabilitation effectiveness of CFRP sheets was investigated. Experimental results show that the rigidity of the reinforced concrete columns after exposure to fire can be enhanced to some extent by CFRP sheets, but the enhancement is not apparent. In various loading stages from the initial loading to 80% ultimate load, the ratio of axial rigidity of axial compression specimens rehabilitated by CFRP sheets and that at normal temperature ranges from 0.25 to 0.39, and the ratio of flexural rigidity of the eccentric specimens rehabilitated by CFRP sheets and that at normal temperature ranges from 0.14 to 0.39. Compared with the influence on rigidity, the influence of CFRP sheets on load bearing capacity is more remarkable. The load bearing capacity of the specimens rehabilitated by the CFRP sheets can be enhanced from 1.67 times to 2.37 times of that without being repaired. But compared with the specimens without exposure to fire, the load bearing capacity of reinforced concrete columns after exposure to fire which are repaired by CFRP sheets are still lower, the ratio of the load bearing capacity of specimens rehabilitated by CFRP sheets at normal temperature is from 0.54 times to 0.67 times.

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Last Update: 2011-12-20