Fractured steel frame progressive collapse analysis method based on column removing method

Abstract

The invention discloses a fractured steel frame progressive collapse analysis method based on a column removing method. According to the invention, a flexibility-method beam unit is used for dividing rod pieces of a steel frame, a simple division method taking fracture into consideration is provided, dual judgment on the fractured rod pieces is introduced, the advantages of small number of divided sections of the rod pieces, short time consumed for calculation and accurate result are achieved, the model establishment of the steel frame, the automatic generation of a command stream and OpenSees calculation calling are realized, and furthermore, the universal specific analysis of progressive collapse of the steel frame is realized.

Description

technical field [0001] The invention belongs to the field of continuous collapse analysis of steel frames, and relates to a continuous collapse analysis method of steel frames with fractures in civil engineering specialty. Background technique [0002] The continuous collapse of the structure refers to the collapse of the whole structure or the collapse of the whole structure due to the chain damage in the horizontal and vertical directions caused by the damage of some components under the action of unconventional loads (mainly explosions, vehicle impacts and heavy object impacts, etc.). Extensive collapse that is disproportionate to the initial damage. [0003] by Figure 1a Taking the single-layer planar frame in , as an example, a brief description of the realization of the column extraction method can be divided into the following three steps: [0004] 1) For the original complete model before column failure ( Figure 1a ) for static analysis to obtain the static intern...

AI Technical Summary

Problems solved by technology

[0010] 1. The fracture of the rod is less introduced, the function is insufficient and the effect is not ideal;

[0011] 2. The parameters that can be customized are limited, and the parameters (such as stiffness matrix integration method, time step) are mostly set by default, and the process is fuzzy and error-prone (such as the stability problem of explicit integration);

[0012] 3. Due to the use of stiffness method elements, it is necessary to divide hundreds of elements to make the results accurate, and the calculation takes a long time and it is difficult to obtain the correct solution;

[0013] 4. It is difficult to describe the stress-strain relationship of the unit when the material adopts the uniaxial constitutive structure;

[0014] 5. It is impossible to conveniently carry out related operations such as column extraction to deal with the specific problem of continuous collapse of the structure

Images