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Method for producing prestressed structures and structural parts by means of SMA tension elements, and structure and structural part equipped therewith

A technology of prestressed structures and structural components, applied in the direction of structural elements, building components, building structures, etc., can solve the problem that anti-corrosion is no longer guaranteed

Active Publication Date: 2017-11-28
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the inner armature is located in the carbonated area, the corrosion protection of conventional steel is no longer ensured

Method used

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  • Method for producing prestressed structures and structural parts by means of SMA tension elements, and structure and structural part equipped therewith
  • Method for producing prestressed structures and structural parts by means of SMA tension elements, and structure and structural part equipped therewith
  • Method for producing prestressed structures and structural parts by means of SMA tension elements, and structure and structural part equipped therewith

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Embodiment Construction

[0019] Initially, the properties of shape memory alloys (SMAs) should be understood. These structurally specific alloys can be modified by heat and return to their original condition after heat removal. Like other metals and alloys, shape memory alloys (SMAs) contain more than one crystal structure, ie, they are polymorphic and are thus polycrystalline metals. The dominant crystal structures of shape memory alloys (SMAs) depend on their temperature on the one hand and, on the other hand, on stresses - tension or pressure - acting from the outside. At high temperatures, the structure is austenite, however, at low temperatures, the structure is martensite. A peculiarity of these shape memory alloys (SMAs) is that, even though they have previously been deformed in the low temperature stage, after increasing their temperature, they recover their original structure and shape in the high temperature stage. This effect can be used to apply prestress within the structure.

[0020] ...

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Abstract

The method is distinguished in that at least one tension element (1), for example in the form of a flat steel composed of a shape memory alloy of polymorphic and polycrystalline structure which can be brought from its state as martensite to its permanent state as austenite by increasing its temperature, is placed on the structure or structural part (2). The tension element (1) can also be guided around one or more corners (5). One or more end anchors (4) penetrate into the structure or structural part (2). Such a flat steel can also wrap one or more times as a band around a structure or structural part (2), in which case the two ends of the flat steel are either connected to one another so as to be fixed in terms of tensile force or are each separately connected to the structure or structural part (2) by one or more end anchors (4) which penetrate into the structure or structural part (2), or else intersect one or more times to produce a clamping connection. The flat steel (1) contracts as a result of a subsequent active and controlled input of heat using heating means and generates a permanent tensile stress and correspondingly a permanent prestress on the structure or the structural part (2). A structure or structural part thus equipped is characterized in that it has at least one tension element (1) composed of a shape memory alloy which extends along the outer side of the structure or structural part and is connected thereto by means of end anchors (4). Alternatively, the structure or structural part (2) can also be completely enclosed by a tension element (1) in the form of a flat steel as a band, wherein the two end regions are connected so as to be fixed in terms of tensile force, and the flat steel is permanently prestressed by the input of heat.

Description

technical field [0001] The invention relates to a method for producing tensioned structural elements in new buildings (cast at the construction site) or for prefabrication and for subsequent reinforcement of existing structures or generally any structural elements. For subsequent tensioning of the structure, tensioning elements made of shape memory alloys are applied, known to those skilled in the art as shape memory alloy profiles, or in short SMA profiles. By means of this subsequent tensioning, the extension can also be installed under prestress on existing structures. The invention also relates to a structure or a structural component produced by applying the method or subsequently reinforced, or to which an extension is butted according to the method. In particular, for this purpose steel-based shape memory alloys are used as tension elements or tie rods in order to generate the prestress. Background technique [0002] In general, prestressing of a structure increases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G21/12E04G23/02E04C5/01E04C5/08
CPCE04C5/01E04B1/06E04C5/08E04G23/0218E04G21/12E04G23/0225E04G2021/127C22C38/00Y10T29/49863Y10T29/49865Y10T29/49632C22C38/105C22C38/14
Inventor 马苏德·莫塔韦利贝内迪克特·韦伯沃克吉恩·莱罗尔夫·布龙尼曼克里斯托夫·恰德斯基克里斯蒂安·莱嫩巴赫莫斯林姆·沙赫韦尔迪朱利安·米歇尔斯
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