Manufacturing and Reinforcement Technology for Steel Structures to Enhance Seismic Performance

Abstract

This invention relates to steel manufacturing and seismic reinforcement technology for improving the seismic performance of steel structures and existing concrete structures. More specifically, it is a technology that effectively absorbs and disperses seismic loads by forming a defect section in the tension part of the steel and adding a reinforcing material that induces plastic deformation in that area. In particular, by additionally including a plastic hinge-inducing reinforcing material, the integration of the structure is strengthened, and the steel structure and the concrete structure are completely integrated through high-strength mortar and adhesive synthetic resin to prevent brittle fracture at the joint. Furthermore, this invention is designed to prevent corrosion and ensure long-term stability by applying a coating process to enhance the durability of the steel structure. Through this, it provides an innovative seismic reinforcement solution that maximizes the stability of building structures during an earthquake and improves constructability and economic efficiency.

Description

Technology Field

[0001] This invention belongs to the technical field of seismic reinforcement of building structures, and in particular relates to steel structural members designed to improve seismic resistance performance and a technology for integrating them with existing concrete structures. Furthermore, it includes an advanced coating processing method to improve the durability, corrosion resistance, and overall performance of steel structures. This technology addresses technical challenges for ensuring effective load transfer, joint stability, and long-term reliability for seismic reinforcement, and is applicable to various construction and civil engineering projects aimed at reinforcing the seismic performance of existing buildings, bridges, and other major infrastructure. Background Technology

[0002] Cases of damage caused by earthquakes strongly indicate the need for seismic design in domestic buildings. Currently, more than 80% of domestic buildings lack seismic design, leaving them vulnerable to structural instability in the event of an earthquake. In particular, public facilities and school buildings are identified as sectors urgently requiring seismic reinforcement (6:6†Steel frame connection structure for seismic reinforcement and seismic construction method using the same)

[0003] Regarding seismic reinforcement technology, prior art includes Patent No. 10-1870309 (Steel joint structure for seismic reinforcement and seismic construction method using the same) and Patent No. 10-1922832 (Steel structure for seismic reinforcement and coating processing method thereof). Patent No. 10-1870309 proposes a technology that secures steel members to the surface of a reinforced concrete structure using flat base plates and anchor bolts, thereby ensuring integrated behavior between the steel structure and the existing structure to respond to seismic loads. This technology is characterized by simultaneously securing load transfer and stability by designing the gap of the steel joint structure attached to the existing concrete structure (6:6†Steel joint structure for seismic reinforcement and seismic construction method using the same).

[0004] Furthermore, Patent 10-1922832 includes a technology that achieves the integration of a seismic reinforcement steel structure with an existing structure by filling an adhesive synthetic resin between the base surface of a reinforced concrete structure and an adhesive reinforcing plate. This technology enhances seismic performance by combining high-strength mortar with a load-transfer plate, while simultaneously preventing corrosion of the steel structure and strengthening its durability through a coating process. These technical features significantly contribute to increasing the efficiency of seismic load transfer (7:7†Seismic Reinforcement Steel Structure and Method for Coating the Same).

[0005] However, while existing technologies have contributed to improving seismic performance, they have limitations in ensuring perfect joint stability between structures or simplifying the construction process. To address these issues, this invention proposes an innovative technology that more effectively implements the integrated behavior of steel structures and existing concrete structures, while simultaneously ensuring constructability and economic efficiency during the seismic reinforcement process. The problem to be solved

[0007] The objective of the present invention is to provide a method for manufacturing steel structures that enables steel structures and existing concrete structures to behave as an integrated unit during an earthquake, thereby absorbing seismic loads and maximizing structural safety. To this end, a new design is proposed that improves seismic performance by forming a defect section in the tension portion of a steel beam and adding a reinforcing material that induces plastic deformation in that area.

[0008] In addition, another objective of the present invention is to effectively induce plastic bending and hinge formation caused by vibration loads by utilizing upper and lower plastic hinge-inducing reinforcing materials, and to maximize energy absorption capacity to realize seismic load distribution and suppression of structural deformation.

[0009] Furthermore, another objective of the present invention is to enhance durability by applying a coating processing technology that prevents brittle fracture at the joints, ensures long-term stability, and prevents corrosion through the integrated bonding of steel structures and existing concrete structures using high-strength mortar and adhesive synthetic resin. In addition, the invention aims to enable efficient seismic reinforcement of existing buildings through an economical method that maximizes constructability. means of solving the problem

[0012] To solve the above problems, the present invention provides a new technology that maximizes the seismic performance of steel structures and increases construction efficiency. The main feature of the present invention is to design and apply reinforcing materials capable of effectively absorbing seismic loads by forming a defect section in the tension portion of a steel beam to induce plastic deformation. The reinforcing materials consist of compression reinforcing materials placed at the lower ends of both sides of the defect section and tension reinforcing materials placed at the top; this configuration ensures the stability of the structure by optimizing the load transfer path. In addition, upper and lower plastic hinge-inducing reinforcing materials are additionally installed at the ends of the reinforcing materials to control the location where plastic deformation occurs and to maximize the energy absorption effect in response to vibration loads.

[0013] High-strength mortar and adhesive synthetic resin are used to achieve perfect integration between the aforementioned steel structure and the existing concrete structure, thereby preventing brittle fracture at the joints and ensuring structural integrity. The high-strength mortar is injected between the steel beams, reinforcing materials, and the existing concrete structure to form an integrated structure, while the adhesive synthetic resin fills the voids between the structures to enhance stability. In particular, the mortar and adhesive play a crucial role in preventing the inefficient distribution of seismic loads by improving structural bonding strength during load transfer.

[0014] The present invention also contributes to reducing maintenance costs by enhancing durability and preventing corrosion through the application of advanced coating processing technology to steel structures and reinforcing materials. The coating is applied uniformly via a spray method, minimizing corrosion and damage to the steel structures caused by the external environment. Furthermore, to improve constructability, the present invention standardizes the design and manufacturing processes of steel beams and reinforcing materials, thereby simplifying on-site work and enabling the reduction of construction time and costs.

[0015] This process encompasses everything from the design of the defective section and the placement of reinforcements to mortar injection, the use of adhesives, and the coating of the steel structure, with each step organized efficiently and systematically. The technology of the present invention not only overcomes the limitations of existing seismic reinforcement methods but also provides an innovative seismic reinforcement technique capable of simultaneously ensuring economic efficiency and seismic performance. Through this, seismic loads are effectively absorbed and structural deformation is controlled, thereby guaranteeing the stability and long-term reliability of the structure. Effects of the invention

[0018] According to the present invention, the seismic performance of a structure can be dramatically improved by preventing brittle fracture that may occur at the joints of a steel structure and maximizing the energy absorption efficiency against seismic loads. Specifically, seismic energy is effectively absorbed by inducing plastic deformation in specific sections where seismic loads are concentrated through a combination of a defective section of a steel beam and a plastic hinge-inducing reinforcement. In addition, stable load transfer and structural integration are provided in the event of an earthquake by integrating the steel structure with the existing concrete structure using high-strength mortar and an adhesive synthetic resin.

[0019] Furthermore, this invention ensures corrosion prevention and long-term stability by applying a coating processing technology that enhances durability to steel structures. This technology reduces maintenance costs and extends the lifespan of the structure. In addition, by simplifying the construction process and designing for economic efficiency, it can be efficiently applied to existing buildings, making it suitable for large-scale infrastructure improvement projects. In particular, the application of this invention can overcome the limitations of existing seismic reinforcement technologies and significantly enhance the stability and reliability of buildings. Brief explanation of the drawing

[0021] 1: Top fixing plate - A part that serves to fix the top of the structure. 2: Connecting member - A part that connects each component and strengthens integration. 3: Main body cylinder - The central part of the structure, responsible for bearing the main load. 4: Reinforcement - A part that reinforces the main body cylinder to increase durability and stability. 5: Bottom fixing plate - Secures the bottom of the structure and maintains balance. Specific details for implementing the invention

[0022] This invention proposes specific methods for the design, construction, and coating of steel structures to maximize seismic reinforcement performance. Plastic deformation is induced by forming a gap of a certain length in the tension section of a steel beam. The gap is set at a location where the load is concentrated and serves to absorb and disperse energy during an earthquake. The length of the gap is adjusted according to the design load and size of the steel beam and is generally set to a length of 200 to 300 mm. Compression reinforcement is installed at the lower ends of both sides of the gap, and tension reinforcement is placed at the top to efficiently disperse seismic loads. The reinforcement is made of steel or carbon fiber and is designed to be perfectly bonded to the steel beam.

[0023] The steel structure fabrication method involves flattening the steel surface using a grinder and connecting the steel to the reinforcement using high-strength stud bolts. Subsequently, structural integrity is enhanced by filling the gaps and the steel containing the reinforcement with high-strength mortar. The mortar is poured around the gaps and reinforcement using formwork, and sufficient curing time is ensured to guarantee optimal strength. The cured mortar fills the gaps between the steel and the existing concrete structure, maximizing the stability of the joints.

[0024] Coating processing is a critical process for enhancing the durability and corrosion resistance of steel structures. Steel frames and reinforcing materials are coated with anti-corrosion coatings via heat treatment or spray coating. First, the steel structures are placed on a conveyor system to create a continuous working environment. A spray coating device is used to apply an anti-rust coating of uniform thickness, followed by a heat treatment process to strengthen the adhesion and durability of the coating. This coating protects the steel surface, prevents corrosion caused by environmental factors, and ensures long-term stability.

[0025] During the construction process, the joints between the steel frame and the existing concrete structure are leveled using a grinder to remove foreign matter and enhance joint efficiency, while reinforcing materials are secured at their designed positions via welding or bolts. Laser alignment equipment is used to ensure precise positioning during this process. Mortar is poured around the defective sections and reinforcing materials using formwork, and sufficient curing time is subsequently allowed to guarantee optimal strength. The seismic performance of the structure is verified through real-time sensors and non-destructive testing equipment, and a regular maintenance plan is established to inspect the coating condition and joint strength. Through these steps, the present invention can effectively absorb seismic loads, maximize structural stability, and simultaneously ensure construction efficiency. Explanation of the symbols

[0028] 1: Top fixing plate 2: Connecting member 3: Main body cylinder 4: Reinforcement 5: Bottom fixing plate

Claims

Claim 1 A method for manufacturing a steel structure to respond to seismic loads, comprising the steps of: forming a defect section with a length of 200 to 300 mm in a steel tension section; installing a compression reinforcement member positioned at a 45-degree angle at the lower ends of both sides of the defect section and a tension reinforcement member positioned at the upper end, respectively, to induce load distribution; and additionally installing a plastic hinge-inducing reinforcement member at the ends of the compression and tension reinforcement members to induce plastic bending and energy absorption. Claim 2 A method for manufacturing a steel structure according to claim 1, characterized by injecting high-strength mortar into the joint between the steel structure and the existing concrete structure to strengthen the connection of the steel structure, and sealing the area around the joint using an adhesive synthetic resin to achieve integration of the structure. Claim 3 A method for manufacturing a steel structure according to claim 1 or 2, characterized in that, to prevent corrosion of the steel structure and reinforcing material, a coating agent that enhances durability is applied to the surface of the steel structure and reinforcing material, and a uniform film is formed by a spray coating method to improve seismic performance.

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