Study On The Local Buckling Behavior Of High Strength Steel Members Under Axial Compression

With the development of steel structures, the use of high strength steel in building and bridge constructions has been increased very rapidly in many countries and districts in the world, and good effects have been obtained. Compared with ordinary strength steel, high strength steel has many advantages in many aspects, so it is believed that high strength steel will be used more frequently in the future. However there is a lack of study on the local buckling behavior of high strength steel members under axial compression, and the corresponding study basis for the design methods of high strength steel structures is deficient, which makes it necessary to perform a systematic research with both experimental and numerical investigations.This paper introduces the engineering application of high strength steel, the mechanical behavior characteristic of high strength steel members under compression, and the advantages of high strength steel. By summarizing the existing research results on the local buckling behavior of high strength steel members under axial compression, this paper analyzes the deficiency of the current research. Aiming at the local buckling behavior of high strength steel equal angles under axial compression, this paper firstly studies the stability design methods in Chinese and foreign codes for high strength steel equal angles under axial compression, and analyzes the rationality of these methods. Then this paper conducts an axial compression experiment of Q420 hot-rolled steel equal angle stub columns, and the test results are compared with the corresponding design methods and calculation formulae in Chinese, American and European steel structures design codes. Finally finite element models are developed in this paper by using the general-purpose finite element software, ANSYS, to analyze the local buckling behavior of high strength steel equal angles under axial compression, and the finite element analysis results are compared with the test results. By using the validated finite element model, the finite element parametric analysis is conducted on the local buckling behavior of high strength steel equal angles under axial compression, and the corresponding design suggestion is given.