Reinforcement material and reinforcement structure of structure and method of designing reinforcement material

Abstract

Disclosed is a reinforcing member, which comprises a woven body formed by a weaving process, or a tape-shaped or sheet-shaped body, having a high ductility and high bendability. The reinforcing member is adapted to be installed on a surface of a structure member or a boundary portion of the structure member, or inside a structure member, to reinforce the structure member. The woven body, or a tape-shaped or sheet-shaped body, has a Young's modulus equal to or less than that of the structure member, and a tensile fracture strain of 10% or more. The Young's modulus of the reinforcing member is preferably in the range of 1/2 to 1/20, more preferably 1/5 to 1/10, of that of the structure member. Specifically, the Young's modulus of the woven body is preferably in the range of 500 to 50000 MPa, more preferably 1000 to 10000 MPa. The present invention also provides a reinforced structure using the above reinforcing member.

Description

TECHNICAL FIELD The present invention relates to a reinforcing member for a structural body, a reinforced structure using the reinforcing member, and a method for designing the reinforcing member. BACKGROUND ART Heretofore, there have been known various techniques (reinforced structures, reinforcing members and reinforcing methods) for reinforcing a member of a structural body (hereinafter referred to as “structure member”). Among them, a conventional technique characterized by installing a reinforcing member on the surface of or inside a structure member subject to reinforcement includes (1) a technique of embedding a reinforcing bar in concrete as a substrate, or so-called reinforced concrete technique, (2) a technique of driving a bolt or nail into a substrate, (3) a technique of incorporating a high-strength steel rod inside concrete as a substrate and introducing a tensile force to the steel rod, (4) a technique of wrapping a steel plate around a structure member, or so-calle...

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Problems solved by technology

Thus, if a substrate is locally subjected to a large strain, the reinforcing member cannot follow the local strain, resulting in loss of the reinforcement effect due to the occurrence of local fracture in the substrate or local buckling or cracks in the reinforcing member.

Further, while this reinforcing member is designed using a formula based on the assumption that it has only tensile rigidity, an intended reinforcement effect is actually likely to be lost due to occurrence of bending or local buckling in consequence of the flexural rigidity and shear rigidity of its own.

The material, such as carbon or aramid fibers, used in the techniques (5), (7), (11) and (16), has a fracture strain of 2% to several %, which is liable to cause damages by the corners of a substrate or the unevenness of the surface of a substrate.

Further, if the substrate has some cracks due to a certain external force, the reinforcing member will be locally broken, which leads to significant deterioration or disappearance of the reinforcement effect.

In the techniques (1) to (15), if a structure member contacting with another structure member or having a flat shape or a concavo-convex or irregular surface is reinforced by forming a through-hole therein and penetratingly inserting a reinforcing member into the through-hole, such a construction work will involve a problem of high cost and/or extended period, and a particular technology or tool will be required to fix the edge of the reinforcing member or insert the reinforcing member.

Therefore, if the strength of the substrate is lowered due to aged deterioration or such an aged deterioration is calculated, the above technique cannot be applied.

In the technique of introducing a tensile force to a steel rod, if i

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