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doi:10.13228/j.boyuan.issn1001-0777.20180003

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Abstract��Q345qE steel plate cracked when it was used on bridge��Macro-analysis�� scanning electron microscope analysis and optical-analysis were applied to analyze the fracture cause of the steel plate. The results showed that due to the crack of the surface protection materials asphalt�� the Q345qE steel plate was exposed in the atmosphere and corroded�� and under the condition of the vehicle operation force�� the stress corrosion was formed. In U rib plate parts�� the microcracks were formed�� and the stress concentration and the expansion of the microcracks occurred under the action of corrosion and stress�� which eventually led to the fracture.

Key words�� Q345qE U rib stress corrosion asphalt

�ո��: 2017-12-28 ��: 2018-12-24

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��־�գ��. ��Q345qE�ְ��ʧЧ��[J]. , 2018, 36(5): 40-43. WANG Zhi-gang��WANG Jun-lin��. Fracture failure analysis of Q345qE steel plate for bridge. , 2018, 36(5): 40-43.

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http://gt.chinamet.cn/Jweb_wlcs/CN/10.13228/j.boyuan.issn1001-0777.20180003 �� http://gt.chinamet.cn/Jweb_wlcs/CN/Y2018/V36/I5/40