火灾下活性粉末混凝土梁斜截面承载性能研究

doi:10.11896/cldb.22110018

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Abstract In order to find out the degradation law of the bearing capacity of the inclined section of reactive power concrete (RPC) beams under fire, six RPC simply supported beam specimens were designed and made, and ISO834 standard fire tests were carried out under dead load. Data such as time-displacement curve, load-displacement curve, internal temperature variation, crack development, failure pattern and high temperature bursting were obtained. The influences of shear-span ratio, load level, hoop ratio and longitudinal reinforcement ratio on the bearing performance of RPC beam in oblique section under fire were analyzed. The results show that the shear span ratio and load level are the key factors affecting the fire resistance limit of RPC beam. When the shear span ratio increases from 2.5 to 3.5 and the load level increases from 0.25 to 0.45, the fire resistance limit of RPC beam can be reduced for more than 30 min. The stirrup ratio has a significant effect on the oblique bearing capacity and fire resistance limit of RPC beams. The reinforcement ratio of longitudinal reinforcement has little influence on the fire resistance limit of RPC beams. Fire high temperature and burst weakened the oblique section bearing capacity of RPC beams. The burst caused the internal materials to be directly subjected to fire, which accelerated the deterioration of mechanical properties and reduced the oblique section bearing capacity of beams by more than 33.5%. The research results can provide reference for the bearing safety of oblique section of RPC beam under fire and the reinforcement and repair after fire.

Key words： reactive powder concrete (RPC) beams the fire resistant test refractory limit oblique section bearing capacity

Published: 10 May 2024 Online: 2024-05-13

CLC number:	TU378.2
	TU317.1

Fund:National Natural Science Foundation of China, ( 52378520, 52038006, 52308510) and the Taishan Scholars Program (tsqn202211181).

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	Articles by authors
	YAN Kai
	ZHANG Qian
	HUANG Binchao
	ZHANG Xin

Cite this article:

YAN Kai,ZHANG Qian,HUANG Binchao, et al. Study on Load-Carrying Properties of Inclined Section of Reactive Powder Concrete Beam Under Fire[J]. Materials Reports, 2024, 38(9): 22110018-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22110018 OR http://www.mater-rep.com/EN/Y2024/V38/I9/22110018

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