Automatic initial failure device for continuous collapse test of rectangular rod piece space structure

Abstract

The invention discloses an automatic initial failure device for a continuous collapse test of a rectangular rod piece space structure. Two webs and a lower flange are cut off from the part, which is close to a to-be-damaged node, of the rectangular rod piece at the to-be-damaged node of the rectangular rod piece space structure, an initial failure device is adopted to replace the cut-off part of the rectangular rod piece, the initial failure device comprises an open rectangular pipe, a first electromagnet, a second electromagnet and a spring, the first electromagnet and the second electromagnet are matched with each other, and the open rectangular pipe is arranged between a rectangular rod piece body and an assembly type hollow hub joint and located below an upper flange of the cut-off part; the first electromagnet is arranged in an opening of the open rectangular pipe, and the second electromagnet is arranged on the lower surface of the upper flange of the cut-off part; and the springis arranged between the open rectangular pipe and the upper flange of the cut-off part. The principle that the electromagnet has strong magnetism when being powered on and loses magnetic force when being powered off is utilized, automatic failure of the junction of the rectangular rod piece and the assembly type joint is achieved, and rod piece failure, joint failure and connection failure can beeffectively simulated.

Description

technical field [0001] The present invention relates to space structure, steel structure, structure test technology, particularly relates to an automatic initial failure device for continuous collapse test of rectangular bar space structure. Background technique [0002] In recent years, structural progressive collapse resistance has become a hot topic in engineering research, and the design and analysis of structural progressive collapse resistance have therefore received more attention. The types of structures involved in the actual project are various and complex, and there is a risk of continuous collapse in different structures, and a large number of problems need to be solved urgently. [0003] In the process of structural collapse test, an initial failure device is usually introduced to simulate the damage of key components or nodes inside the structure due to accidental factors. For large-span spatial structures, the initialization failure device is usually introduc...

AI Technical Summary

Problems solved by technology

These mechanical initial failure devices can only simulate the initial failure of round steel pipe rods, and manual operation is required when triggering, so it is difficult to guarantee the accuracy and safety of the test

On this basis, some researchers have proposed a steel clip-type electromagnet initial failure device, which can simulate the initial failure in the middle of the rod, but the above-mentioned initial failure device is mainly suitable for circular cross-section rods, and cannot be applied to rectangular cross-section rods. It is also unable to simulate the failure of nodes and the connection failure of nodes and members

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