BUCKLING STRENGTH STUDY FOR HIGH-STRENGTH SINGLE-ANGLE MEMBERS WITH A CONCENTRIC LOAD AT ONE END

摘要

To obtain a better understanding of the behavior and load-carrying capacity of Q460 high-strength singleangle compression members with a concentric load at one end and normal framing eccentricity at the other end, three-dimensional model of specimens were analyzed by ANSYS, in addition to these factors in model experiment, such as different slenderness ratios、different types and initial out-ofstraightness, influences of residual stresses on ultimate load-carrying capacity were analyzed by finite element numerical simulation analysis. The analysis shows: the bending deflection of the angle occurred in a direction parallel to the connected leg, meanwhile, the twisting deformation occurred in a longitudinal direction of specimen, the residual stresses affect the ultimate load-carrying capacity of angles by about 5% or less. Finite element results compare with theoretical results, the results show: finite element value is larger about -11.5%～+7.8%, 1.4%~+27.4% and 16.8%~97.4% than experimental value, American Design of Latticed Steel Transmission Structure (ASCE10-1997) and Chinese Technical Regulation of Design for Tower and Pole Structure of Overhead Transmission Line (DL/T5154-2002), the agreement is somewhat good between the finite element analysis and experimental program. Therefore finite element results are reliable, using finite element method to analyze buckling strength of high-strength single-angle with a axial load at one end is feasible. Based on model experiment and simulated experiment, the transformation formulas of ASCE were established, this design method is more safe and economical, which can provide reference for practical engineering.