High-temperature resistant prestressed steel stranded wire

A technology of prestressed steel strands and high temperature resistance, which is applied in the direction of textiles, papermaking, textile cables, etc. It can solve the problems of steel brittleness, difficulty in large-scale promotion, and falling off of fireproof coatings, and achieve good mechanical properties.

Active Publication Date: 2018-10-30
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The former method needs to change the existing steel casting process, which is difficult to promote in a large area, and the steel is prone to brittle fracture under low stress; the latter method will reduce the bonding stress between the steel strand and the concrete, and the fireproof coating is easy to Shedding under reciprocating loads such as earthquakes

Method used

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  • High-temperature resistant prestressed steel stranded wire
  • High-temperature resistant prestressed steel stranded wire
  • High-temperature resistant prestressed steel stranded wire

Examples

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Embodiment

[0019] A high temperature resistant prestressed steel strand, its structure is as follows figure 1 As shown, including the inner core 1 and the stranded wire 2 wound outside the inner core 1, the inner core 1 is a shape memory alloy inner core with a diameter of 5.25±0.05mm, and the austenite finishing temperature is 200-400°C. In the embodiment, the stranded wire 2 is provided with 6 strands of steel wires with a diameter of 5.07±0.05mm, and the stranded wires made of steel are used, which are spirally wound on the outside of the inner core.

[0020] Shape memory alloy (SMA) has a unique shape memory effect, and SMA will transform from martensite phase to austenite phase and return to the original shape at high temperature. If the traditional prestressed steel wire is stranded with SMA to make a steel strand, and prestress is applied to both ends, the SMA will produce considerable restoring force at high temperature, which can offset the prestress loss of the traditional stee...

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Abstract

The invention relates to a high-temperature resistant prestressed steel stranded wire comprises an inner core and a plurality of stands of stranded wires wound around the outer side of the inner core.The inner core is made from a shape memory alloy (SMA) material, and the stranded wires are spirally wound around the outer side of the inner core. Compared with the prior art, the inner core made from the SMA material is used, the SMA is converted from a martensitic phase to an austenite phase under high-temperature induction, is restored to an initial state and produces a prestressing force under a constraint effect, considerable resilience is produced, and accordingly the prestressing force of the steel stranded wire is not too low or even is improved somewhat.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a high temperature resistant prestressed steel strand. Background technique [0002] According to statistics, it generally takes 2 hours for a building fire to be extinguished from the onset of the fire. At this time, the temperature of the prestressed tendons inside the prestressed concrete structure usually reaches nearly 400°C. Under the action of high temperature, traditional steel strands will not only deteriorate in strength and stiffness, but also cause serious prestress loss due to the high temperature creep of itself and concrete, which not only reduces the bearing capacity of the structure, but also accelerates the cracking and deformation of the structure. Cracking and deformation accelerate the high temperature of the fire to spread to the inside of the components, further aggravating the loss of prestress and structural deformation, thus forming a vicious circle, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D07B1/06D07B5/00
CPCD07B1/0673D07B5/005D07B2401/2035D07B2501/2015D07B5/006
Inventor 李凌志贾英琦刘兆乾包洪印余江滔
Owner TONGJI UNIV
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