Theoretical And Experimental Study On Integral Stability Of High Strength Steel To Axial Compression

High strength steel can effectively reduce the member section’s size, reduce the amount of steel, and can improve the use of the building area and the use of space. High strength steel has been widely used in developed countries.It already has a production capacity of high-strength steel in China, and been used in part of the construction project. However, It has not been required in the current design of steel structures on the yield strength more than 420MPa high strength steel design method does. It only require 460MPa in the ongoing revision of the design of steel structures.There is no design specifications for the strength more than 420MPa high strength steel about steel. If applied in the project, we need specific engineering specialized research before use. There is a serious affect on the application of high-strength steel building structures in China because the design specification of the application is not complete.Recent years, many studies on the property of this kind have been carried out in China, but the research is not enough. In this thesis, it explores the overall stability of the calculation method about the Q550 high-strength steel, welded H-type axial compression members as the research object through theoretical analysis and experimental comparison..It summarizes the research results of the analysis of residual stress distribution of existing welded H-beam mode based on the finite element software simulation, selects a suitable high strength steel welding residual stress distribution pattern of the H-shaped cross section; on finite element software, considered the residual stress, geometric defects influencing factors on the basis of the analysis of the stable performance of high-strength steel welded H member, different residual stress distribution patterns of component stability, and calculate the slenderness ratio corresponding stability factor; choose 6axial compression members of a group of high-strength welding H type stability test to verify the theoretical analysis of the reasonableness; through theoretical analysis and experimental comparison with European design of steel structures, design of steel structures contrast, as well as the design of steel structures in Chinathe ordinary steel components stable calculation method analogy, stable computing method of Q550 high strength welded H-type axial compression members recommended. The analysis results show that the stability factor of high strength steel components by the existing design of steel structures conservative.