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An external steel strand mesh device using steel rods to resist tension and prevent continuous collapse of structures

A steel strand and anti-structure technology, which is applied to structural elements, building components, building structures, etc., can solve the problems of low ultimate strength, low efficiency, and affecting the appearance of buildings, so as to improve the performance of anti-successive collapse and device Strong adaptability and good economical effect

Inactive Publication Date: 2017-02-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The method of increasing the reinforcement or section of related components to improve the performance of progressive collapse has the following disadvantages: (1) The efficiency is not high
Because the ultimate strength of building steel bars is not high, the effect of adding steel bars to improve the effect of suspension cables is limited
(2) Uneconomical
The increase of steel bars may cause the over-reinforcement of the member, so the cross-section of the member has to be enlarged and the cost will be increased
(3) Unsightly
After increasing the section, it is easy to form "wide beams and fat columns", which affects the beauty of the building

Method used

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  • An external steel strand mesh device using steel rods to resist tension and prevent continuous collapse of structures
  • An external steel strand mesh device using steel rods to resist tension and prevent continuous collapse of structures
  • An external steel strand mesh device using steel rods to resist tension and prevent continuous collapse of structures

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Effect test

Embodiment 1

[0033] like image 3 and Figure 4 as shown, image 3 It is a bottom view of the structure of the external steel strand mesh device using steel rods to resist tension and prevent continuous collapse of the structure shown in the embodiment. Figure 4 for image 3The side schematic diagram of the external steel strand mesh device using steel rods to resist the continuous collapse of the structure is shown. An external resistance-adjustable steel strand mesh device for preventing continuous structural collapse, which is composed of several connection units connected in a criss-cross pattern, the connection unit includes two sections of connection lines and connection devices, and the two sections of connection lines pass through the The connecting device is connected to form a connecting unit; the connecting wire is a steel strand 4 . All steel strands run vertically and horizontally in the node area, thus forming a mesh arrangement below the floor. Horizontally and longitu...

Embodiment 2

[0065] A column at the bottom of a reinforced concrete frame structure was damaged by accidental loads. The two vertical adjacent spans are both 5m long, equipped with steel bar 4C14 (C indicates the type of steel bar HRB400) that can produce suspension effect, the standard value of the dead load of the uniform wiring acting on the horizontal member is 5kN / m, and the standard value of the live load of the uniform wiring is 5kN / m. It is 3kN / m, and the ultimate tensile strength of the steel bar is 540MPa. Vertical displacement S at mid-span when the steel bar breaks 3 is 1m, the design value of the maximum vertical uniform wiring load that can be borne is 9.93kN / m.

[0066] In order to improve the resistance against progressive collapse, two sections of 10A are arranged below the beam section S 15.2 (Ultimate tensile strength of 1860MPa) steel strands and a connection box. Two first-level steel rods, two second-level steel rods, and two third-level steel rods in the connectio...

Embodiment 3

[0083] A column at the bottom of a reinforced concrete frame structure was damaged by accidental loads. The two vertically adjacent spans are 9m in average, equipped with 6C25 steel bars that can produce suspension cable effect, the standard value of the dead load of the uniform wiring acting on the horizontal member is 7.5kN / m, and the standard value of the live load of the uniform wiring is 4.5kN / m. The ultimate strength of steel bar is 540MPa. The vertical displacement S at the removal column when the steel bar is broken 3 is 1.8m, and the design value of the maximum vertical uniform wiring load that can be borne is 26.37kN / m.

[0084] In order to improve the resistance against continuous collapse, two sections of 10A are configured S 17.8 (tensile ultimate strength is 1960MPa) steel strand and a connection box. Two first-level steel rods, two second-level steel rods, and two third-level steel rods in the connection box have a circular cross-sectional shape, and the radi...

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Abstract

The invention provides an external resistance-adjustable steel strand net device preventing structure continuous collapse through tensile strength of steel rods. The steel strand net device is formed by connecting a plurality of connecting units in a criss-cross mode. Each connecting unit comprises two connecting wires and a connecting device, wherein the two connecting wires are connected through the connecting device to form the connecting unit. The connecting wires are steel strands (4), the connecting devices are connecting boxes (5), and a plurality of anchors, a high-strength steel block (7), two first-level steel rods, two second-level steel rods and two third-level steel rods are arranged in each connecting box (5). The steel strand net device has the advantages of being high in efficiency, good in economy and capable of not affecting attractiveness of buildings.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and relates to a device located outside the structure with adjustable resistance and preventing continuous collapse of the structure. Background technique [0002] Due to their functional characteristics and geographical location, some buildings may be subjected to accidental loads during their service period, such as strong earthquakes far exceeding the design level, gas explosions, terrorist explosions, and vehicle impacts. Accidental loads can cause local damage to the building structure. If the damage spreads further and causes large-scale collapse of the structure, it is called continuous collapse in engineering. The continuous collapse of structures greatly threatens the safety of life and property, and can have serious social impacts. A famous example in history is the collapse of the World Trade Center Building in the 9 / 11 incident in the United States in 2001. Therefore, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02E04C5/16E04C5/18
Inventor 林峰张逢伯
Owner TONGJI UNIV
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