Composite Reinforcement for Box-Type Concrete Structures
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Solution Overview
Problem
Box-type concrete structures face challenges in resisting shear force and negative moments, particularly at corners, leading to structural safety issues and insufficient earthquake resistance due to the limitations of conventional reinforcement materials and existing seismic reinforcement devices.
Innovation Solution
A composite material reinforcement device integrating a hollow aluminum beam with a prepreg sheet and a trapezoidal cross-section central portion, featuring a reinforcement portion with a first and second plate, extension portions, and a connection member to enhance rigidity and ductility, while being chemically resistant and suitable for installation in vulnerable areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional reinforcement materials (steel plates) are used to reinforce box-type concrete structures, then structural strength can be improved, but the materials cannot be used because they are conductors and concrete fails to increase load-carrying capacity in negative moment sections
Solution Approach 1:
The invention uses a composite material consisting of a non-conductive reinforcing material (such as fiber-reinforced polymer) combined with a specific structural configuration (corner reinforcement device with dispersion plates) to simultaneously achieve both strength enhancement and maintained load-carrying capacity in negative moment sections. The composite structure allows strength improvement without the electrical conductivity issues of steel plates.
2Force
If earthquake-resistant devices are attached to connect ceiling to side wall to disperse external force, then member force is reduced, but resistance force of the member is not increased and earthquake resistance performance is insufficient
Solution Approach 1:
The invention applies preliminary reinforcement to the corner sections before seismic events occur by installing the corner reinforcement device with dispersion plates that pre-establish enhanced load paths and force distribution mechanisms. This preliminary strengthening ensures that when seismic loads are applied, the structure has already been prepared with increased resistance force, not just force dispersion capability.
3Reliability
If reinforcement device is used to disperse shear force and negative moment at corners, then structural safety is improved, but rigidity and ductility capabilities are not simultaneously improved
Solution Approach 1:
The invention applies local quality enhancement by concentrating the reinforcement device specifically at the corner sections where stress concentrations occur during seismic events. The dispersion plates are strategically positioned at corners to provide localized improvements in rigidity and ductility where they are most needed, rather than uniformly reinforcing the entire structure. This localized approach simultaneously improves structural safety and maintains/enhances rigidity-ductility characteristics at critical locations.
Data Source
AI summary
A composite material reinforcement device may include: a central portion including an edge portion provided to have an inner space having a trapezoidal cross-section with reference to a longitudinal direction, and a partition wall portion dividing the inner space into at least one partition space; and a reinforcement portion located on a top and a bottom of the central portion and integrally molded to cover the central portion, wherein the reinforcement portion includes: a first plate located on the top of the central portion to cover an upper portion of the central portion; a second plate curved to correspond to a shape of the central portion and located at the bottom of the central portion to cover a lower portion of the central portion; and an extension portion in which the first plate and the second plate extend from both ends of the central portion to be bonded to each other.