Comprehensive structure prestress reinforcing method on basis of influence line theory

A technology of influencing lines and prestressing, applied in bridge reinforcement, building construction, building maintenance, etc., can solve the problems of small dead load ratio, reduce the normal performance of composite sections, etc., achieve the effect of reducing stress difference and novel concept

Active Publication Date: 2015-03-04
邢兵 +2
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Problems solved by technology

For example, for a reinforced concrete structure, if the concrete strain lag of the newly reinforced layer is serious, cracks may spread outward from the concrete at the interface between the old and the new; Occurs due to faster strain growth, the first cracking of the new reinforcement layer, which will reduce the normal service performance of the composite section

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  • Comprehensive structure prestress reinforcing method on basis of influence line theory
  • Comprehensive structure prestress reinforcing method on basis of influence line theory
  • Comprehensive structure prestress reinforcing method on basis of influence line theory

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with specific embodiments (taking the unloading and reinforcement of the arch foot of a hingeless arch bridge as an example). The schematic embodiments and descriptions of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0028] Under the action of dead load and operating live load of hingeless arch bridge, the arch foot produces a large negative bending moment, which can easily lead to cracking of the arch back at the arch foot and cracking of the soffit at the vault, such as figure 2 As shown, 4 is the left arch, 5 is the vault, 6 is the right arch, 41 is the crack of the left arch, 51 is the crack of the vault, and 61 is the crack of the right arch. image 3 As the bending moment influence line of the left arch foot of the hingeless arch bridge, the load is carried out in the positive value area of ​​the influence line ( image 3 Th...

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Abstract

The invention discloses a comprehensive structure prestress reinforcing method on the basis of the influence line theory. The comprehensive structure prestress reinforcing method includes steps of analyzing by means of the influence line theory in the structural mechanics, temporarily adjusting (loading or deloading) the internal force within a certain area in an influence line to change the state of the internal force or the stress within a section to be reinforced; reinforcing the section to be reinforced; finally, stopping temporary adjustment of the internal force to actively adjust the stress distribution of the reinforced combined section after the strength of the reinforcing layer is achieved and new and used materials are effectively combined, so that the 'stress difference' of the reinforced new and used materials stays reasonable and perfect reinforcing effect is realized. The comprehensive structure prestress reinforcing method is novel in concept and utilizes the influence line theory skillfully to temporarily adjust the internal force of the section to be reinforced before reinforcing, so that the reinforced concrete is prepressed or pretensioned (structural prestress), the stress difference of new and used concrete is reduced and stress performance of the reinforced combined section is improved.

Description

technical field [0001] The invention relates to the technical reinforcement field of civil engineering, in particular, it is applicable to a structural prestress comprehensive reinforcement method based on the influence line principle. Background technique [0002] The method of increasing section reinforcement (including pasting steel plates or carbon fibers) is widely used in the reinforcement of various bridges and building structures. The section enlargement method is a passive reinforcement method. The original section of the component bears its own weight before reinforcement and the self-weight caused by the section enlargement. In the composite section after reinforcement, the newly added part only bears the live load after reinforcement, while The original section is subject to constant and live loads before and after reinforcement. The reinforced structure (section) belongs to the secondary stress structure (section), and there is a certain degree of "strain (stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D22/00E04G23/02
CPCE01D22/00E04G23/0218
Inventor 邢兵肖林肖军龙中华聂强
Owner 邢兵
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