A self-circulating piezoelectric material prestressed concrete box girder

Abstract

The invention discloses a self-circulating type piezoelectric material prestressed concrete box girder. A piezoelectric material is adopted as a solid material to replace prestressed reinforcing steel bars, and the voltage at the two ends of a piezoelectric prestressed component is controlled, so that the prestress of the piezoelectric material prestressed concrete box girder is changed according to the inverse piezoelectric effect. The piezoelectric material is applied to a pressed region of a bridge, external power supply is adopted for assistance, and therefore self-circulating supply of electric energy in a structural system is achieved. The power supply quantity of a piezoelectric power generation device, the tensile stress of a pulled region of the concrete box girder and the prestress on the piezoelectric prestressed component are monitored in real time through a bridge monitoring system, so that macroscopic adjustment and control over the bridge structural system are achieved. The self-circulating type piezoelectric material prestressed concrete box girder has the beneficial effects of being safe, reliable, capable of saving energy, environment-friendly, high in automation degree and the like, health monitoring and prestress adjustment of the structural system in the bridge use process can be achieved, and therefore the durability and safety of the box girder structure are enhanced.

Description

technical field [0001] The invention relates to a self-circulating piezoelectric material prestressed concrete box girder, which belongs to the technical field of bridge engineering. Background technique [0002] With the rapid development of the national economy, my country's road traffic is also accelerating. As an important part of road traffic, bridge structure plays a very important role in restricting the development of road traffic. Long-span prestressed concrete girder bridges have been widely used because they have a large span and can meet the needs of crossing rivers and seas. [0003] With the widespread use of prestressed concrete box girders in the field of civil engineering, its engineering application defects due to its own structural and material limitations are frequently exposed. First of all, due to the prestressed concrete production process and the inherent characteristics of the material, the stress value of the prestressed steel bar continues to decr...

AI Technical Summary

Problems solved by technology

The occurrence of the phenomenon of loss of prestress leads to a constant decrease in the stress values ​​in the prestressed reinforcement, which over time compromises the safety characteristics of the structure

Secondly, although the designer will deal with the loss of prestress and the increasing load of the bridge based on the calculation of the safety factor during the prestress design calculation process, as the traffic flow continues to increase, the live load on the bridge is increasing rapidly. The original prestressed design cannot meet the requirements of the existing traffic demand state

Finally, excessive prestress design in the design stage may lead to arching of the bridge, affecting the beauty of the specific bridge structure and increasing the utilization of materials and the difficulty of construction

[0004] To sum up, due to technical limitations of materials and tensioning process, the existing prestressing technology has its prestressing load formed at one time, which cannot be changed without considering the loss, and does not have the ability to deal with the external environment. Adaptive ability

Images