|Table of Contents|

Comparation of failure behavior of high-performance steel beams with general corrosion and shear-span corrosion(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年6期
Page:
71-82
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Comparation of failure behavior of high-performance steel beams with general corrosion and shear-span corrosion
Author(s):
XIAO Lin-fa1;  PENG Jian-xin2;  CHEN Hua-peng1
(1. School of Transportation Engineering, East China Jiaotong University, Nanchang 330013, Jiangxi, China; 2. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China)
Keywords:
bridge engineering;  high-performance steel;  numerical simulation;  corrosion;  flexural performance;  failure mechanism
PACS:
U448.225
DOI:
10.19721/j.cnki.1671-8879.2023.06.007
Abstract:
In order to explore the difference in the failure mechanism of the general corrosion and shear-span corrosion high-performance steel(HPS)beams, 9 H-shaped Q460D high-performance steel beams were designed, and the bending mechanical properties of these two kinds of beams were compared and studied. Firstly, the two types of corroded steel beams with different corrosion levels were obtained by electrochemical accelerated corrosion method. Based on 3D scanning technology, the spatial morphology of corroded steel beams were reproduced. Then, the four-point bending loading tests of steel beam were carried out. The section discreteness of two kinds of steel beams and the slenderness ratio of each component were discussed to clarify the influence of corrosion on geometric characteristics. The load-deformation response, strain development law of web and flange and failure behavior were compared and analyzed. Finally, considering the degradation of material mechanical properties and geometric initial defects, finite element models were established based on ANSYS software. The influence of factors such as corrosion length and corrosion level on the degradation performance of steel beams was explored in detail. The results show that corrosion reduces the dispersion of the cross-section area, and promotes the compression flange to become slender. When the corrosion damage is less than the critical corrosion level 10%, the strength and stiffness of the two groups of beams are not degraded much. Further corrosion causes the general corroded beam to undergo lateral torsional deformation and local buckling in advance, and the failure model of the local corroded beam in the shear span changes from local buckling failure to web buckling failure. In addition, numerical analysis found that the corrosion damage of the compression flange or the tension flange has little effect on the mechanical behavior of the general corroded test beam, and webs and stiffeners have greater influence on the bending performance. When the corrosion damage is higher than 30%, the mechanical properties of corroded beams in shear span section deteriorate obviously. When the corrosion length reaches near the middle of the web near the mid-span, the failure position will gradually shift from the middle of the span to the corrosion interface of the shear span.2 tabs, 18 figs, 31 refs.

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Last Update: 2023-10-30