高温(火灾)后Q355qNH桥梁耐候钢的力学性能试验研究

doi:10.11896/cldb.22050150

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Abstract To investigate the post-fire mechanical properties of bridge weathering steel (WS) after expose to high temperature, the tensile test of Q355qNH steel considering eight socking temperatures from 300 ℃ to 1 000 ℃ and two cooling methods, which were cooling in air (CA) and cooling in water (CW), was carried out. The microscopic fracture morphology under the two cooling methods was studied. The effect of high temperature treatment and cooling method on the stress-strain relationship and mechanical parameters of Q355qNH steel was analyzed, and the results were compared with that of building steels after expose to high temperature. Results show that high temperature treatment and cooling methods have little influence on the elastic modulus of Q355qNH steel. The plastic plateau of the stress-strain curve disappears when the WS specimens cooling in water after expose to 800 ℃ high temperature or above. Besides, there are obvious plastic plateau in other cases. When the socking temperature reaches 700 ℃ or above, the effect of cooling methods on the strength of Q355qNH steel is gradually appears, and the yield strength and ultimate strength with CA condition begin to decrease, however, the elongation after fracture increases. For the CW condition, the ultimate strength increases and the elongation after fracture decreases with the increases of socking temperature, and the variation of yield strength greatly fluctuates. Compared with results of building steels in exciting literatures, Q355qNH weathering steel shows a better fire resistance from the perspective of post-fire strength.

Key words： Q355qNH bridge weathering steel post-fire cooling method mechanical property

Published: 10 December 2023 Online: 2023-12-08

CLC number:

TU502

Fund:National Natural Science Foundation of China (52038006) and Major Scientific & Technological Innovation Projects of Shandong Province (2021CXGC011204).

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	Articles by authors
	ZHANG Xin
	YIN Hang
	ZHAO Ernian
	LIU Jinhui

Cite this article:

ZHANG Xin,YIN Hang,ZHAO Ernian, et al. Experiment on Post-fire Mechanical Properties of Q355qNH Bridge Weathering Steel[J]. Materials Reports, 2023, 37(23): 22050150-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22050150 OR http://www.mater-rep.com/EN/Y2023/V37/I23/22050150

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