The method of strengthening the structure by the method of externally mounted pc frame method
A reinforced structure and prefabricated technology, used 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 fail to form a whole, so as to achieve flexible layout, improve resilience, Use features for small effects
Inactive Publication Date: 2015-10-28
BEIJING UNIV OF TECH
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Problems solved by technology
The combination of the existing structure and the externally 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.
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Embodiment 1
[0026] The specific construction method, taking the application in the frame beam as an example:
[0027] In this example, the size of the original frame beam is 150mmX300mm, 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 100mmX300mm, the strength grade of the concrete used is C40, the strength grade of the steel bar is HRB400, and the prestressed The rib is 1X7 with a diameter of 12.7 and a strength of f ptk =1860N / mm 2 , f py =1320N / mm 2 . According to the analysis results of the model, it is shown that Figure 4 , compared with the unreinforced load-carrying capacity increased by nearly 35%.
[0028] a. Design and manufacture
[0029] 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 to the prefabricated unit, and make the newly added p...
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The invention provides a method for structure reinforcing by externally bonding an assembly type PC framework and belongs to the field of concrete structure reinforcing. The assembly type PC framework is externally bonded on the outer side of an original reinforced concrete frame structure and comprises newly-added prefabricated reinforced concrete frame beams and columns which are connected through unbonded pre-stressing tendons. The newly-added prefabricated reinforced concrete frame beams and columns are respectively connected with original reinforced concrete frame beams and columns through unbonded pre-stressing tendons. In the method for structure reinforcing, the original reinforced concrete frame structure is connected with a new reinforced concrete frame structure through unbonded anchoring pre-stressing tendons, pressure and friction are produced at the contact portions of the original and new frames by means of prestressing force of the unbonded pre-stressing tendons to enable the original and new portions to be tightly connected, and the bearing capacity, rigidity, ductility and the like of a reinforced concrete structure can be effectively improved. Constructors are not required to enter buildings in the construction process, moving operation is not needed, the efficient, economic and practical effects are achieved, and the method is very favorable for the reinforcing effect.
Description
technical field [0001] The invention belongs to the field of concrete structure reinforcement, and in particular relates to an externally assembled PC frame method reinforcement 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-section, the method of...
Claims
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IPC IPC(8): E04G23/02
Inventor 李振宝付静解咏平李汉杰马华
Owner BEIJING UNIV OF TECH