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Intelligent prestress system

A prestressed and prestressed tendon technology, applied in the field of prestressed systems, can solve the problems of reduced concrete performance, inability to control large structural deformations, and difficulty in fully functioning restoring force, achieving the effect of simple structure and convenient control

Inactive Publication Date: 2008-12-24
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These existing methods and devices, because the shape memory alloy must be poured together with the structure to form a composite material, due to the different deformation of the two materials, it is impossible to control the large deformation of the structure
Moreover, the bond between the shape memory alloy and the concrete is insufficient, and there is no device such as an anchor to ensure the joint deformation of the shape memory alloy and the structure, making it difficult for the restoring force to fully function
Heat generated during simultaneous excitation degrades concrete performance

Method used

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Embodiment Construction

[0011] Such as figure 1 As shown, the intelligent prestressing system of the present invention includes an anchorage and a prestressing tendon 5, the prestressing tendon 5 is made by stretching a shape memory alloy in a low-temperature martensite state, and the two ends of the prestressing tendon 5 are connected to the adjustable DC The power supply is connected in 8 phases. The prestressed tendon 5 can be set in two forms in vitro or in vivo according to actual needs, and the anchors at both ends of the prestressed tendon 5 are used for fixing and tensioning. The anchorage is divided into two parts: a fixed end and a tensioned end. In this embodiment, The fixed end is provided with a fixed anchor plate 6, the inner side of the fixed anchor plate 6 is provided with an insulating plate 4, the tension end is provided with a backing plate 3, the inner side of the backing plate 3 is also provided with an insulating plate 4, and the outer side of the backing plate is provided with ...

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Abstract

The invention discloses an intelligent prestressing system, which includes an anchor and a prestressing tendon. The prestressing tendon is made of a shape memory alloy stretched in a low temperature martensitic state, and the two ends of the prestressing tendon are connected to the adjustable DC The power supply is connected. The present invention uses shape memory alloys as materials to make prestressed tendons, and an adjustable DC power supply energizes the prestressed tendons so that the shape memory alloys generate a restoring force, and the restoring force of the shape memory alloys is used to change the force of the prestressed components conditions, thereby controlling the stress and deformation of prestressed members. The invention has a simple structure and can be precisely controlled by a control system conveniently.

Description

technical field [0001] The invention relates to a prestressing system capable of intelligent control. Background technique [0002] With the deepening of civil engineering research, more and more attention has been paid to structural stress control. By controlling the stress state of important load-bearing components, the stress and deformation of the entire structure can be controlled to cope with possible changes in the use of the structure and sudden adverse conditions. As an important intelligent driving material, shape memory alloy (SMA) has self-sensing properties and shape memory effect. Using the self-sensing property of SMA, it can sense the strain in itself and even in the structure. The shape memory effect of a shape memory alloy refers to the ability to remember and return to its shape in the austenitic state. If the SMA is stretched in the low temperature martensitic state and left with a large plastic deformation, then after heating the SMA to a certain temp...

Claims

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Application Information

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IPC IPC(8): E04C5/08E04C5/12E04G21/12
Inventor 薛伟辰李杰周黎黎
Owner TONGJI UNIV
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