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Structure reinforcing method in externally-attached steel-encased assembly type PC frame mode

A technology for strengthening structures and outsourcing steel, applied in building construction, building maintenance, construction, etc., can solve the problems of lack of connection between old and new concrete, increase the seismic performance of the structure, and cannot form a whole, so as to achieve flexible layout and improve resilience. , Good anti-seismic effect

Inactive Publication Date: 2014-04-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of the existing structure and the externally attached and outsourced steel assembled PC frame not only increases the seismic performance of the structure, but also solves the problems that the old and new concrete lack connection and cannot form a whole, and the stress and strain lag.

Method used

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  • Structure reinforcing method in externally-attached steel-encased assembly type PC frame mode
  • Structure reinforcing method in externally-attached steel-encased assembly type PC frame mode
  • Structure reinforcing method in externally-attached steel-encased assembly type PC frame mode

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Embodiment 1

[0029] The specific construction method, taking the application in the frame beam as an example:

[0030] In this example, the size of the original frame beam is 150mm×300mm, the strength grade of the concrete used is C35, the strength grade of the steel bar is HRB335, the size of the external prefabricated beam is 100mm×300mm, the strength grade of the concrete used is C40, and the strength grade of the steel bar is HRB400, the prestressed tendon adopts 1×7, the diameter is 12.7, and the strength is f ptk =1860N / mm 2 , f py =1320N / mm 2 , The steel plate is made of 5mm thick Q345 steel. According to the analysis results of the model, it is shown that Figure 4 , Compared with the unreinforced, the bearing capacity is increased by nearly 50%.

[0031] a. Design and manufacture

[0032]According to the section size of the original reinforced concrete frame beam 1, the newly added prefabricated reinforced concrete frame beam 2 section is designed. Submit the design results...

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Abstract

The invention belongs to the concrete structure reinforcing field and provides a structure reinforcing method in an externally-attached steel-encased assembly type PC frame mode. A steel-encased assembly type PC frame is externally attached to the outside of an original reinforced concrete frame structure, steel plates of steel-encased prefabricated reinforced concrete frame columns wrap columns below lower sections of beams, and holes of pre-stressed tendons are reserved in the steel plates. Beams and columns of a newly-added prefabricated frame are connected through the unbonded pre-stressed tendons and are connected with beams and columns of the original frame respectively in an unbonded pre-stressed tendon mode. The original frame structure is connected with the new frame structure through the unbonded pre-stressed tendons, and by means of the pre-stressing force of the unbonded pre-stressed tendons, pressure and friction generate on the contact portion between the original frame and the new frame, so that the original frame and the new frame are tightly connected together, and bearing capacity, rigidity, ductility and the like of the reinforced concrete structure are effectively improved; workers do not need to enter a house, and relocation is not needed in the construction process, efficient, economical and practical effects are achieved, and the structure reinforcing method is quite beneficial to the reinforcing effect.

Description

technical field [0001] The invention belongs to the field of concrete structure reinforcement, in particular to an externally pasted and externally wrapped steel assembled PC frame method reinforced structure. Background technique [0002] Reinforced concrete frame structures and bottom frame structures have been widely used in multi-story buildings due to their flexibility in spatial arrangement. Due to the different functions of the bottom frame structure, the structural layout is different, and it is easy to form a structural system with uneven rigidity and rigid top and soft bottom. There may be a serious lack of earthquake resistance, and tilting or collapse will occur during an earthquake, which will cause great obstacles and economic costs to structural repair and disaster relief. [0003] my country's "Code for Design of Reinforcement of Concrete Structures" (GB50367-2006) proposes a variety of reinforcement methods. For example, the method of enlarging the cross-s...

Claims

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Application Information

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IPC IPC(8): E04G23/02
Inventor 马华付静解咏平张婷婷李振宝
Owner BEIJING UNIV OF TECH
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