Method for solving residual deformation of middle damping rigid beam component under action of explosive load

Abstract

The invention relates to a method for solving residual deformation of a medium-damping rigid beam component under the action of an explosion load, which belongs to the technical field of anti-explosion design, and specifically comprises the following steps: the damping parameter xi2 of the medium-damping rigid beam component is equal to a plastic strengthening coefficient alpha under the explosion action; the critical moment te corresponding to the fact that the component completes the maximum elastic vibration ye and is about to enter plastic vibration is smaller than the numerical value of the action duration ti of the explosion load, after the explosion load is unloaded, the component continues to vibrate to a certain moment tm, the total elastic-plastic displacement maximum value ym of the component is achieved, and the maximum elastic-plastic displacement value ym of the component is obtained according to the whole action process of explosion. The process is divided into six stages of elastic stage forced vibration, plastic stage forced vibration, plastic stage free vibration, elastic springback stage, plastic springback stage and elastic vibration, and then the residual deformation of the middle damping rigid beam component under the explosive load effect is determined.

Description

technical field [0001] The invention relates to a method for solving the residual deformation of a rigid beam member with medium damping under the action of an explosion load, and belongs to the technical field of explosion-resistant design. Background technique [0002] The equivalent single degree of freedom method (SDOF), as a dynamic analysis method with high computational efficiency, is widely used in engineering anti-blast codes in various countries, and is often used as a checking method for displacement analysis of beam member explosion load tests. The building anti-blast code and most of the test designs allow the beam members to have a certain degree of plastic displacement, which also shows that the member stiffness of the SDOF system should include two parts: elastic and plastic. When characterizing the plastic stiffness, the code and most researchers often ignore the plasticity The ideal elastoplastic resistance model of resistance has not studied the displaceme...

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Problems solved by technology

The building anti-blast code and most of the test designs allow the beam members to have a certain degree of plastic displacement, which also shows that the member stiffness of the SDOF system should include two parts: elastic and plastic. When characterizing the plastic stiffness, the code and most researchers often ignore the plasticity The ideal elastic-plastic resistance model of resistance has not studied the displacement influence of the plastic stage resistance strengthening effect of beam members under explosion

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