The Stablity Behavior Analysis Of Lipped H-Section Of Cold-Formed Steel To Flexural Members

As the the metallurgy technology continues to progress, in recent years, high-strength cold-formed steel has been developed vigorously. Cold-formed steels and cold-formed steel members are facilitated to industrial production which can take advantage of the steel performance. Light-weighted steel structure has been more widely used at home and abroad as the main load-bearing elements. Since the most of the wall thickness of such members does not exceed6mm, so the stability of components is particularly prominent, and the design must overcome the problem. Crimping flange of the H-shaped cross-sectional steel is proposed a few years a new cross-sectional form, the main the flanges increase in bead aims to improve the flange buckling strength and lateral bending stiffness. However, the relative lack of information about the components of such section forms, the of various crimping flange H-shaped cross-section steel members and stability is unclear, thus becoming such components are application and development of the shackles. This article focuses on the crimping flange H-shaped cross-section beam unidirectional curved case of stable performance.Our nation’s codes "Cold-formed Steel Structure Technical Specifications (GB50018-2002)", using the effective width method for the calculation of the stability capacity of flexural members; Australian codes COLD-FORMED STEEL STRUCTURES (AS/NZS4600:2005) introduce the Direct Strength Method in the appendix. For the lipped flange H-shaped cross-section steel, direct strength method is more simple and practical means for design calculations. According to the current industry standard design structure with "High-frequency Welding of Thin-walled H-section Steel JG/T137-2007"and related research papers a number of members and analysis by finite strip method. Set four parameters:lip width coefficient, the aspect ratio of the cross-section, the web thickness ratio, flange width-to-thickness ratio, analyze the influence of changes in the study parameters on the stability of the bearing capacity of the beam. By analyzing the influence of various parameters on the component capacity:Crimping width coefficient of the bearing capacity of the member is weak; due to the limitations of practical factors, flange width-to-thickness ratio range, so its members bearing capacity not; cross-sectional aspect ratio the second; impact on the carrying capacity of the member web thickness ratio greater impact on the carrying capacity of the member.