Intelligent self-monitoring and self-repairing memory alloy composite beam

Abstract

The invention discloses an intelligent self-monitoring and self-repairing memory alloy composite beam, which includes an upper concrete slab and a lower I-shaped steel, as well as a memory alloy shear nail as a sensing element and a shear nail embedded in the upper concrete slab along the beam length direction. Carbon fiber‑memory alloy composite, memory alloy shear studs are used to connect the upper concrete slab and the lower I-beam. It also includes an alloy resistance measurement circuit for measuring fatigue cracks inside the upper concrete slab during structural use, and an alloy excitation drive circuit for reset deformation of the carbon fiber-memory alloy composite after external heating of the memory alloy. The present invention adopts the shear nail made of memory alloy material as the connector connecting the upper and lower parts of the composite beam, mainly utilizing the superelasticity characteristic of memory alloy itself; ), which can be used as a sensing element to realize effective self-monitoring.

Description

technical field [0001] The invention relates to an intelligent self-monitoring and self-repairing memory alloy composite beam, belonging to the field of bridge beams and slabs. Background technique [0002] The bridge beam and plate member is the main load-bearing member of the bridge superstructure, which directly bears the vehicle load transmitted by the upper vehicle. Its use environment is complex and it has long-term service. If serious damage and deformation occur, it will greatly affect the stability and safety of the bridge structure itself. , and sometimes lead to a larger disaster - the overall collapse of the bridge deck. [0003] In the project, steel-concrete composite beams generally use upper concrete and lower I-beams, and the two are connected by shear connectors. The main problem with this method is that two kinds of fatigue failures often occur in traditional composite beams: fatigue crack failure of the concrete beam plate itself and fatigue fracture of ...

AI Technical Summary

Problems solved by technology

The main problem with this method is that two types of fatigue damage often occur in traditional composite beams: the fatigue crack damage of the concrete beam slab itself and the fatigue fracture of the shear connector between concrete and steel

[0004] Aiming at the problems of fatigue crack damage or other types of crack defects that may occur in actual bridge engineering during use, this invention proposes a new type of composite beam that can self-monitor and self-repair internal crack defects

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