Abstract

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Title:: Influence Factor Analysis of Mechanical Behavior of Compression-bending Member of Steel Structure Strengthened by Welding Under Load

Author(s):: JIANG Li; WANG Yuan-qing; DAI Guo-xin; ZHANG Tian-shen; SHI Yong-jiu; Chongqing Architectural Design Institute of China

Keywords:: steel structure; strengthening; welding under load; compressionbending member; mechanical behavior; influence factor

Abstract:: In order to investigate the mechanical behavior of compressionbending member of steel structure strengthened by welding under load, the finite element analysis method considering welding heat effect was used to analyze the influence factors, such as initial load, eccentric distance, slenderness ratio, class of weld heat input. The whole loading process simulation analyses of 72 members of unstrengthened and strengthened bending steel columns were carried out, and the influence rules of the factors were acquired. The new secondorder design formula of nominal stress was verified as well. The results show that initial load level can be evaluated by the secondorder formula. The mode and amount of initial geometrical imperfections effect the direction of buckling and magnitude of residual deformation. Besides, the factor order of influencing on the ultimate capacity of strengthened specimen is eccentricity, slenderness ratio, welding heat input and initial stress. While concerning the welding residual deformation, the factor order turn out to be welding heat input, initial stress and slenderness ratio. The conclusion can provide reference and basis to establish the design calculation method of compressionbending member strengthened by welding under load in Code for Design of Strengthening Steel Structure.