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Connecting unit capable of preventing structure progressive collapse after corner post failure and using method thereof

A technology for connecting units and rear defenses, which is applied in building construction, building maintenance, construction, etc. It can solve the problems of heavy modification workload, large changes in architectural plans and structural plans, and large amount of rework, so as to improve the ability to resist collapse , reduce the amount of design rework, and improve the effect of the stress state

Inactive Publication Date: 2016-10-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Progressive collapse of the structure occurs if the approximate cantilever action of the span beam does not provide sufficient resistance to balance the upper load
[0005] For the case of removing the corner columns, the method of increasing the reinforcement and section of the end-span beam and shortening the length of the end-span to improve the performance of progressive collapse has the following disadvantages: (1) The efficiency is not high
On the premise that the height of the building is roughly determined, increasing the beam height and reinforcement to increase t

Method used

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  • Connecting unit capable of preventing structure progressive collapse after corner post failure and using method thereof
  • Connecting unit capable of preventing structure progressive collapse after corner post failure and using method thereof
  • Connecting unit capable of preventing structure progressive collapse after corner post failure and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] After removing the bottom corner post 1, the upper structure of the corner post 1 tends to fall. At this time, the end beam 2 of each layer has two ends fixedly connected to the support beam, and one end is fixedly connected to a section of sliding support beam to resist continuous collapse. If the bearing capacity of the span beam 2 at the certain end is insufficient, the corners of the structure will be greatly deformed, such as figure 1 As shown, and further continuous collapse may occur. In this example, a suspension cable device is used to enhance the structure's ability to resist progressive collapse.

[0034] figure 2 It is a schematic diagram of the deformation of the structural facade under the normal stress state after adopting the device provided by the present invention shown in the embodiment. In the end span of a certain vertical and horizontal direction, the device is composed of connection units arranged obliquely in each layer from the bottom layer ...

Embodiment 2

[0042] A corner column at the ground floor of a reinforced concrete frame structure was damaged by accidental loads. The building is a six-story office building in a certain place in Shanghai, with a horizontal length of 6m×3 spans, a vertical length of 6m×5 spans, and a floor height of 3.6m. The seismic rating is Class III, the fortification intensity is 7 degrees (0.1g), the soil category of the site is Class IV, the design earthquake is grouped into one group, Class C buildings, the design service life is 50 years, the ground roughness is Class B, and the basic wind Press ω 0 =0.55N / mm 2 . The thickness of the floor is 110mm, the section of the main beam b×h=250mm×600mm, and the section of the frame column is 500mm×500mm. Concrete uses C35, longitudinal reinforcement HRB400, stirrup HRB335. Floor dead load standard value 3.0kN / m 2 , live load standard value 2.0kN / m 2 , the dead load on the beam is 9.9kN / m (the filling wall on the beam and its own weight), and the stan...

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Abstract

The invention provides a connecting unit capable of preventing structure progressive collapse after a corner post failure. The connecting unit comprises two connecting lines and a connecting device; and the two connecting lines are fixedly connected with the connecting device from the two sides to form the connecting unit. The connecting device is a connecting box; a first anchoring device for anchoring one end of the first connecting line in the connecting box and a second anchoring device for anchoring one end of the second connecting line in the connecting box are arranged inside the connecting box. In addition, the invention also discloses a using method of the connecting unit. A plurality of connecting units are arranged in a slanting mode at a structure end span from a bottom layer to a top layer; one end of each connecting unit is tied to a beam column edge node of the structure end span and the other end is anchored in a second node of an upper beam column. According to the invention, a suspension pulling device is formed. And the connecting unit has advantages of high anti-progressive collapse efficiency and high economy and is suitable for cast-in-situ and prefabricated structures.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and relates to a device located outside the structure, suspended obliquely, and preventing the structure from continuously collapsing after corner columns fail. Background technique [0002] Due to functional requirements, geographical location and other reasons, some buildings may be subjected to accidental loads beyond the design level during their service period, such as gas explosions, terrorist explosions, vehicle impacts, etc. 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. Therefor...

Claims

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Application Information

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IPC IPC(8): E04B1/38E04G23/02
CPCE04B1/38E04G23/0218
Inventor 林峰邱璐
Owner TONGJI UNIV
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