Research On Stability Capacity Of Circular Hollow Section Columns Strengthened With CFRP

Strengthening the steel structures with Carbon Fiber Reinforced Polymers (CFRP) is one kind of reinforcement technologies which has unique advantages. It has become a hot research issue at home and abroad recently. Compared with other research direction, research on stability of axially compressed steel columns strengthened with CFRP is relatively small. A complete theoretical system has not been formed and experimental research is insufficient. The specimen used in experimental research were either short column or reduced scale columns at home and abroad. So the performance of steel tube columns commonly used in actual project can not been simulated well. In order to study the stability of axially compressed steel columns strengthened with CFRP, the paper do the experiment of full-scale tubular long columns under axial compression to fill the gaps of the test research in this field.After comparing and summarizing the massive research achievements at home and abroad, this paper took the equivalent section method as researching theoretical basis to study the stability of tubular long steel columns under axial compression. According to the test results, this paper corrected the existing extreme stability capacity calculation formula after considering the effect of CFRP fiber orientation. Finally, this paper carried out the numerical simulation analysis of axial loading test using the ANSYS finite element analysis software.The research results of this paper will propose a theoretical and experimental basis for the compiling of national standard of "Code for design of strengthening steel structure".