A linear elastic method for analyzing the ultimate bearing capacity of a box-section frame structure

The invention relates to a numerical method for analyzing the ultimate bearing capacity of a frame structure, in particular to a linear elastic method for analyzing the ultimate bearing capacity of abox-section frame structure. The linear elastic method for analyzing the ultimate bearing capacity of a box-section frame structure comprises the following steps: (1) establishing an analysis model ofthe box-section frame structure; (2) establishing the expression of upper limit load multiplier of box-section frame structure; (3) performing iterative analysis of linear elasticity; (4) calculatingthe ultimate bearing capacity of box-section frame structure by a linear elastic method. The invention has the following advantages: an accurate upper limit load multiplier is established, and the accurate solution of the ultimate bearing capacity of the box-section frame structure is realized. This method overcomes the shortcomings of the elastoplastic incremental method, such as the complicatedloading process and much in