Earthquake collapse analysis method for high-rise steel frame structure

Abstract

The invention discloses an earthquake collapse analysis method for a high-rise steel frame structure, which comprises the following steps: obtaining the dynamic equation of the high-rise steel frame structure under the earthquake action; according to a central difference method and the dynamic equation, solving the speed and the acceleration of the displacement differential of the high-rise steel frame structure within time interval delta t; according to the Von Mises yield condition and a corrected K&K model, obtaining unit stress sigma t at the t time; defining a failure criterion corresponding to the K&K model; according to the failure criterion, judging whether a unit fails or not; if so, deleting the failed unit; if not, according to a geometric equation and the displacement u(t+delta t) of the high-rise steel frame structure, obtaining the strain increment d epsilon of the unit; according to a damage evolution equation, obtaining the accumulated damage value D of the unit; according to the accumulated damage value D of the unit, calculating the layer damage value of the high-rise steel frame structure; obtaining the stress sigma t+delta t of the t+delta t time unit; and updating time t to t+delta t. According to the earthquake collapse analysis method, the whole collapse damage process of the high-rise steel frame structure under the earthquake action by considering the damage accumulation effect can be precisely simulated.

Description

technical field [0001] The invention relates to the technical field of structural engineering, in particular to an earthquake collapse analysis method of a high-rise steel frame structure. Background technique [0002] Almost all the high-rise buildings in our country are built in the earthquake zone, facing the serious threat of earthquake disasters. Steel structures are widely used in industrial and civil buildings, especially in high-rise building structures, so it is of great significance to study their dynamic response and collapse mechanism under earthquake action. Scholars at home and abroad have done some research on the collapse of frame structures. Document 1 (Hakuno M, Meguro K.Simulation of concrete frame collapse due to dynamic loading[J].Engineering mechanic, 1993, 119(9):1709-1723.) used the discrete element method to realize the dynamic loading of the frame structure. Collapse Simulation, Literature 2 (Zhang Leiming. Research on Structural Collapse Mechanis...

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Problems solved by technology

The dynamic response of frame structures under strong earthquakes is often in the nonlinear plastic stage. The implicit integral adopted by the traditional finite element method is difficult to meet its convergence conditions and cannot analyze the collapse process of the structure; although the discrete element method can satisfy the structural collapse and damage Discontinuity of displacement at time, but the analysis accuracy is too low and time-consuming, the collapse failure mode needs to be given in advance, and the collapse failure mode of the actual structure is often not known in advance, which is not suitable for analyzing the collapse failure of complex high-rise structures

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