School of Architecture Engineering, Binzhou University, Binzhou 256600, China
Steel frame structure is widely used in the field of Civil Engineering. The steel structure is of light quality, good seismic performance and good structure ductility. In addition, the steel structure is convenient for large-scale industrial production. However, the steel material is due to the production process and the construction error, etc. Initial defects are inevitable. In this paper, the first four order buckling modes of the whole structure are introduced as initial defects by using the uniform defect mode method. The numerical simulation is carried out by the finite element software ABAQUS. Three analysis conditions are compared and analyzed. The impact factor of the initial defect is compared as a variable. The results of pushover analysis show that: the effect of initial defects on the bearing capacity of the overall structure is almost negligible when the impact factor of the initial defect is small.When the influence factors of the first four order initial defects are 0.5, 0.3, 0.1 and 0.5, respectively, the yield bearing capacity is reduced by 12.5%, the ultimate bearing capacity is reduced by 8.5%.
Steel frame structure; Q235; Bearing capacity ABAQUS; Pushover analysis
Li Xiaofei. Analysis of Bearing Capacity of Steel Frame Structure Considering Initial Defects. International Journal of New Developments in Engineering and Society (2018) Vol. 2: 7-9.
Si han.Experimental research and finite element analysis on steel braced frame structures with random imperfections[D].Shenyang ： Shenyang Jianzhu University,2014. (in Chinese)
 Basic and Optimum Column Over-Design Factor Avoiding Story Mechanism for Frame Structures[J] . Zhao Yan Gang,Pu Wu Chuan,Li Hong Nan,Ono
 Tetsuro. Key Engineering Materials . 2007 (340) Methods to assess the seismic collapse capacity of building structures: State of the art. Villaverde,Roberto. Journal of Structural Engineering . 2007.
 Xie Qiang. State of the art of buckling-restrained braces in Asia [J]. Journal of Constructional Steel Research, 2005, 61(6):727-748.
 Pushover analysis: why, how, when, and when not to use it. Krawinkler H. Proceedings of the 65th Annual Convention of the Structural Engineers Association of California . 1996.
 Zhao Junxian, Wu Bin, Ou Jinping. A novel type of angle steel buckling-restrained brace: cyclic behavior and failure mechanism[J]. Earthquake Engineering & Structural Dynamics, 2011, 40(10):1083-1102.
 Wang Haiming, Zhang Yaochun. Direct calculation method of overall bending deflection for Cold-formed steel flexural members[j]. Industrial Construction,2011,41(1):130-135. (in Chinese).
 Simple nonlinear seismic analysis of asymmetric buildings. Kilar V,Fajar P. earthquake engineering&Structural Dynamics . 1997.