Keynote Speakers >> Prof. Chen Weizhen
Prof. Chen Weizhen
Prof. Chen Weizhen
Affiliation: Department of bridge engineering, Tongji University, Shanghai, China

Resume

Prof. Weizhen Chen is a principal investigator in the Department of Bridge Engineering of Tongji University. In 1996, he was funded by Deutscher Akademischer Austauschdienst (DAAD) to do research on Steel Structure in Technical University of Munich in Germany. He is the director of bridge assessment and strengthening research division in Tongji University. His current academic research embraces bridge assessment and strengthening, bridge steel structure and bridge fatigue fracture.
Title: Assessment and Strengthening of Steel Truss Bridges
Content:
As most steel truss bridges in China are located in center of urban areas, serving as transit pass, landmark and cultural attraction, good protection of them are therefore very important and necessary. This paper, taking advantage of the repairing of the Waibaidu Bridge of Shanghai (104 years old), is a research of the truss bridge concerning assessment methods and strengthening measures. The research has the following content and conclusion:
  • Detection and analysis of diseases. The disease detection for the bridge involves paint degradation, steel corrosion, permanent deformation of members, and cracks of welded joint so as to determine actual damage state and reveal history of diseases based on archives.
  • Material behavior testing. As the original record of steel material of the bridge is missing, it is difficult to identify mechanical properties and assess structural bearing capacity. Appropriate methods have to be used to get steel samples for various tests of chemical components, mechanical property, and anti-fracture and anti-fatigue behaviors.
  • Establishment of computation model. As establishment of a finite model based on actual mechanic performance and a load model based on real traffic operation are essential for accurate assessment of residual life and safety, this paper presents a two-stage model updating method most appropriate for the simulation study of riveted truss bridges.
  • Assessment of strength and stability safety. The existing way of assessing carrying capacity of steel truss bridges usually presumes a zero-defect structure, without considering diseases like corrosion and rivet defect that will affect carrying capacity of a structure. This paper, making use of the testing results, tries to determine deterioration law of carrying capacity for members at different damage levels so as to assess stability of members, carrying capacity at cross section, and tear of gusset plate and join strength.
  • Fatigue damage and inspection interval. The paper statistically simulates fatigue stress history of tension members, obtains fatigue stress spectrum by rainflow method, and assesses existing fatigue damage of members as per the S-N curve in the fatigue test. Fracture mechanics is employed to calculate residual life of the bridge according to the result of crack detection of key joints and proper inspection interval is recommended.
  • Planning repair and maintenance. In light of construction features of the bridge, a detailed plan for strengthening is discussed and a maintenance method for future use of the bridge is proposed.
Publication
IOP Conference Series: Materials Science and Engineering (MSE)
ISSN: 1757-8981
Index: CPCI-S (ISTP), Google Scholar, CNKI, EI
Important Dates
Paper Submission Due: Oct.25.2018
Conference:December November 17-18.2018
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