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A method for strengthening the exterior joints of reinforced concrete frame structures

A reinforced concrete and frame structure technology, applied in building construction, construction, building maintenance, etc., can solve problems such as poor applicability of space nodes, FRP damage, poor durability, etc., to achieve convenient construction, improve shear strength, and durability good sex effect

Active Publication Date: 2019-05-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods of enlarging the cross-section of concrete and high-strength steel strand mesh-polymer mortar are laborious and time-consuming; methods such as outsourcing profiled steel, pasting steel plates, and externally pasting FRP cloth or slats are quick and convenient, but they are not applicable to space nodes. The durability of the latter is poor, and the latter generally has the peeling damage and problems of FRP in the later stage of loading

Method used

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  • A method for strengthening the exterior joints of reinforced concrete frame structures
  • A method for strengthening the exterior joints of reinforced concrete frame structures
  • A method for strengthening the exterior joints of reinforced concrete frame structures

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Please refer to Figure 1a — Figure 4 , taking the node in a side frame as an example, the cross-sectional size of column 3 is 450×450mm, and the cross-sectional size of beam 4 is 350×700mm. Node strong member" problem (such as insufficient configuration of stirrups in the core area).

[0069] According to the condition of the nodes to be reinforced, the shape and size of PVA-ECC prefabricated slab 1 are shown in Fig. 1-a, 1-b and 1-c. The column end is 55mm thick. A total of 16 reserved holes 2 are placed symmetrically with a diameter of 18 mm. The core area is distributed in a rhombus shape. The four holes are all located on the midline of each side of the core area and are 100 mm away from each side. The specific positions are shown in Figure 1-c.

[0070] Make the template, ensure that the beam end is 25mm lower than the column bottom membrane, and arrange the foam cylinder with a diameter of 18mm in the corresponding position; then inject the stirred PVA-ECC ma...

Embodiment 2

[0076] Please refer to Figure 5a — Figure 8 , taking the edge joint of a side frame as an example, the cross-sectional size of column 3 is 450×450mm, and the cross-sectional size of beam 4 is 350×700mm. Node strong member" problem (such as insufficient configuration of stirrups in the core area).

[0077] According to the conditions of the nodes to be reinforced, the shape and size of the PVA-ECC prefabricated slab 9 are shown in Figures 5-a, 5-b and 5-c. The column end is 55mm thick. A total of 10 reserved holes 2 are placed symmetrically with a diameter of 18 mm. The core area is distributed in a rhombus shape. The four holes are all located at the center line of each side of the core area and are 100 mm away from each side. The specific positions are shown in Figure 5-c.

[0078] Make the template, ensure that the beam end is 25mm lower than the column bottom membrane, and arrange the corresponding position of the cylindrical foam with a diameter of 18mm; then inject t...

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Abstract

The invention relates to a reinforcing method for a reinforced concrete framework structure external facade joint. The reinforcing method comprises the following steps that (1) ECC prefabricated plates are prefabricated; (2) the ECC prefabricated plates are mounted, specifically, the ECC prefabricated plates are pasted to a joint core area, a joint peripheral beam and a column end external facade, and mechanically anchored on the joint core area and at the beam end; and (3) a fiber cloth is pasted to the column end in an enclosing wrapping mode. Thus, when the reinforced concrete framework structure external facade joint is reinforced, the ECC prefabricated plates are pasted to the joint core area, the joint peripheral beam and the column end external facade, the ECC prefabricated plates are mechanically anchored at the joint core area and the beam end, and the fiber cloth is pasted and cover the ECC prefabricated plate at the column end, so that the shearing strength of the joint core area and the bending strength of the beam end are improved, a beam end plastic hinge is moved outwards, the overall anti-seismic performance of the joint is improved, and the numerous defects of a traditional reinforcing method are overcome; and construction is convenient and rapid, safety is high, and durability is good.

Description

technical field [0001] The invention relates to the technical field of concrete reinforcement engineering in civil engineering, in particular to a reinforcement method for a reinforced concrete frame structure facade node. Background technique [0002] Under the action of horizontal earthquake, reinforced concrete frame joints (referred to as "RC joints") are prone to brittle shear failure and cause building damage or collapse. Many existing RC frame structure buildings are designed according to early codes, and their joints often cannot meet the requirements of the current codes, such as insufficient reinforcement in the core area, weak anchorage and other defects, and do not meet the seismic design principle of "strong joints and weak components". As the force transmission hub of the entire frame structure, it is very necessary to take effective seismic reinforcement measures for these RC nodes with insufficient seismic performance. [0003] At present, for the seismic re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02E04H9/02
CPCE04G23/0218E04H9/027Y02A30/30
Inventor 祁尚远王国林丁文胜
Owner SHANGHAI INST OF TECH
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