Mechanical properties and failure mechanism of steel platecomposite beams under strong corrosion(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年2期
- Page:
- 46-54
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Mechanical properties and failure mechanism of steel platecomposite beams under strong corrosion
- Author(s):
- QIAO Wenjing1; ZHU Haoyun1; ZHANG Gang2; YANG Fan1; ZHANG hao
- (1. School of Civil & Architecture Engineering, Xian Technological University, Xian 710032, Shaanxi, China;2. School of Highway, Changan University, Xian 710064, Shaanxi, China)
- Keywords:
- bridge engineering; steel plate composite beam; finite element; strong corrosion; ultimate load; mechanical property; failure mechanism
- PACS:
- -
- DOI:
- -
- Abstract:
- Aimed at the degradation process of mechanical properties for steel plate composite beams under strong corrosion caused by industrial hydrochloric acid, a threespan steel plate composite beam was taken as the research object, based on the decay processes of mechanical properties of steel after corrosion, the bearing capacity calculation formula of positive bending moment of double steel plate composite beam under strong corrosion was deduced. The load was applied to the steel plate beam after corrosion, and the finite element model was established by referring to the existing mechanical performance test data and research results of corroded steel. The failure modes of steel plate composite beams under three corrosion scenarios were analyzed, and the loaddisplacement curves of the key sections were obtained on steel plate beams of different corrosion rates, the failure process of threespan steel plate beams caused by 36% industrial hydrochloric acid was revealed, and the calculation formula of ultimate load with corrosion time was derived on steel plate composite beams after corrosion. The results show that the relative deviation between formula values and finite element values of flexural capacity are 4.31% to 8.12%. When the corrosion time of steel is less than 6 hours, the ultimate load and displacement of the central section in the corrosion area of steel plate beams decrease obviously, when the corrosion time of steel increases from 6 hours to 30 hours, it decrease less, when the corrosion time of steel increases to 30 hours, it decrease more slowly. When the corrosion time of steel reaches 48 hours, the ultimate bearing capacity and displacement of the central section of the corrosion area of steel plate beams are equivalent to 78.82% to 87.11% and 74.94% to 76.54% of the uncoroded section. Because of the boundary constraint in the midspan of continuous beam is stronger than that of the side span, the midspan shows the down deflection of concrete bridge deck and the bulging failure of steel beam, while the side span shows the overall failure of steel plate composite beam. 1 tab, 8 figs, 28 refs.
Last Update: 2021-04-02