Method for solving residual deformation of low-damping flexible beam component under action of explosive load

Abstract

The invention relates to a method for solving residual deformation of a low-damping flexible beam component under the action of an explosion load, and belongs to the technical field of anti-explosion design, and the method specifically comprises the following steps: according to the low-damping flexible beam component, under the explosion action, the damping parameter xi2 of the component is smaller than a plastic strengthening coefficient alpha; within the range of the action duration ti of the explosion load, the vibration of the component does not reach the maximum value of forward elastic vibration, after the explosion load is unloaded, the maximum value ye of forward elastic displacement is reached at the moment te by means of inertia force, after the explosion load is unloaded, the component continues to vibrate to a certain moment tm, the total maximum value ym of elastic-plastic displacement of the component is reached, and according to the whole action process of explosion, the maximum value ym of the elastic-plastic displacement of the component is obtained. The process is divided into six stages of elastic stage forced vibration, elastic stage free vibration, plastic stage free vibration, an elastic springback stage, a plastic springback stage and elastic vibration, and then residual deformation of the low-damping flexible 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 low-damping flexible beam member 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 displacement in...

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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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