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An external resistance adjustable steel strand mesh device for preventing continuous collapse of reinforced concrete structures

A technology of reinforced concrete and steel strands, applied in 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 structural collapse prevention, The device has strong adaptability and good economical effect

Inactive Publication Date: 2017-02-22
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 resistance adjustable steel strand mesh device for preventing continuous collapse of reinforced concrete structures
  • An external resistance adjustable steel strand mesh device for preventing continuous collapse of reinforced concrete structures
  • An external resistance adjustable steel strand mesh device for preventing continuous collapse of reinforced concrete structures

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Effect test

Embodiment 1

[0032] Such as image 3 with Figure 4 As shown, image 3 It is a bottom view of the structure of the external resistance adjustable steel stranded wire net device with the continuous collapse prevention structure shown in the embodiment; Figure 4 for image 3 The side schematic view of the external resistance adjustable steel stranded wire net device with the continuous collapse prevention structure shown. An external resistance adjustable steel stranded wire net device capable of preventing the continuous collapse of the structure is composed of a plurality of connecting units connected crisscrossed and criss-crossed. The connecting unit includes two sections of connecting wires and a connecting device. The two sections of connecting wires pass through the The connecting device is connected to form a connecting unit; the connecting wire is a steel strand 4. All the steel strands run vertically and horizontally in the node area, thus forming a network arrangement under the flo...

Embodiment 2

[0060] A certain column at the bottom of a reinforced concrete frame structure was damaged by accidental load. Its longitudinal adjacent two spans are both 5m, and it is equipped with steel bar 4C14 (C represents the type of steel bar HRB400, the same below) that can produce a suspension effect. The standard value of the constant load on the horizontal member is 5kN / m. The load standard value is 3kN / m, and the ultimate tensile strength of the steel bar is 540MPa. Vertical displacement S in the middle of the span when the steel bar is broken 3 If it is 1m, the maximum vertical average wiring load that can be assumed is 9.93kN / m.

[0061] In order to improve the resistance to continuous collapse, two sections of 10A are arranged below the beam section S 15.2 (Ultimate tensile strength of 1860MPa) steel strand and a connection box. The thickness of the first steel plate 8, the second steel plate 9, and the third steel plate 10 in the connection box are all 100 mm, and the widths ar...

Embodiment 3

[0078] A certain column at the bottom of a reinforced concrete frame structure was damaged by accidental load. The two adjacent longitudinal spans are both 9m in length, equipped with 6C25 steel bars that can produce a suspension cable effect. The standard value of the dead load of the uniform wiring on the horizontal members 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 bars is 540MPa. Remove the vertical displacement S at the column when the steel bar is broken 3 It is 1.8m, and the design value of the maximum vertical average wiring load that can be assumed is 26.37kN / m.

[0079] In order to improve the resistance to continuous collapse, two sections of 10A are configured S 17.8 (Ultimate tensile strength of 1960MPa) steel stranded wire with a connection box. The thickness of the first steel plate 8, the second steel plate 9, and the third steel plate 10 in the connection box are all 120 mm, and the widths...

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Abstract

The invention provides a steel strand mesh device with an adjustable external resistance for preventing a structure from continuous collapsing. The steel strand mesh device is formed by connecting several connecting units in the manner of criss-cross; each of the connecting units comprises two connecting wires and a connecting device; the two connecting wires are connected through the connecting device to form a connecting unit. The connecting wires are steel strands (4), and the connecting device is a connecting box (5); the inner part of the connecting box (5) is orderly provided with a first anchor tool (61), a second anchor tool (62), a high-intensity steel block (7), a first steel plate (8), a second steel plate (9), and a third steel plate (10). The steel strand mesh device is high in efficiency, good in economical efficiency and free from influence on building appearance.

Description

Technical field [0001] The invention belongs to the technical field of civil engineering and relates to a device which is located outside a structure, has adjustable resistance, and prevents continuous collapse of the structure. Background technique [0002] Due to their functional characteristics, geographical location and other reasons, some buildings may suffer accidental loads during their service period, such as severe earthquakes, gas explosions, terrorist explosions, and vehicle impacts that far exceed the design level. Accidental loads can cause local damage to the building structure. If the damage spreads further and causes the structure to collapse in a large area, it is called continuous collapse in engineering. The collapse of structural continuity 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 US 911 incident in 2001. Therefore, it is of gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02E04C5/04E04C5/12
Inventor 林峰张逢伯
Owner TONGJI UNIV
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