Method and system for reinforcing old buildings for urban renewal
By employing digital diagnostics and a toughness-first reinforcement approach, combined with integrated insulation and long-term monitoring, the problems of insufficient targeted reinforcement and overall toughness in old building reinforcement have been solved, achieving a comprehensive improvement in safety, energy efficiency, and historical preservation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DECAI DECORATION
- Filing Date
- 2025-12-17
- Publication Date
- 2026-06-09
Smart Images
Figure CN122169644A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of urban renewal and existing building renovation technology, and in particular to a method and system for reinforcing old buildings for urban renewal. Background Technology
[0002] In urban renewal, the reinforcement of old buildings is a key step in extending the lifespan of buildings, improving safety and functional compatibility, effectively avoiding large-scale demolition and construction, saving resources and protecting historical features.
[0003] In existing technologies, reinforcement methods have long relied on engineering experience and localized treatment thinking, often employing single technical means such as increasing the cross-section or external steel reinforcement. These methods often lack a systematic diagnosis and overall assessment of the building's current condition, and fail to make scientific decisions based on digital models and material performance data. This results in reinforcement schemes that are not targeted enough, resource allocation that is unbalanced, and structural risks of over-reinforcement or under-reinforcement are likely to occur.
[0004] Meanwhile, traditional methods often focus on improving the strength of components while neglecting the overall toughness design of the structural system. They have significant shortcomings, especially in terms of nodal ductility, energy dissipation capacity, and seismic fortification, making it difficult to cope with extreme loads and performance degradation during long-term use.
[0005] In addition, existing reinforcement strategies are usually independent of building energy conservation and historical preservation needs, and do not integrate functions such as insulation and monitoring into the construction system. They lack real-time perception and predictive maintenance mechanisms for the long-term performance of the structure, thus limiting their comprehensive improvement capabilities in terms of safety, sustainability and functionality.
[0006] Therefore, a method for reinforcing old buildings in urban renewal is proposed to address the aforementioned problems. Summary of the Invention
[0007] The technical problem to be solved by this invention is to provide a method for reinforcing old buildings in urban renewal. Through comprehensive diagnosis, structural decision-making, reinforcement of key components and predictive maintenance, the method can improve the safety and service life of buildings, while taking into account both functional improvement and protection of historical information. It is suitable for the renovation needs of old buildings in urban renewal. To solve the above problems, the technical solution adopted by the present invention is as follows: To achieve the above objectives, the present invention provides a method for reinforcing old buildings in urban renewal, comprising the following steps: S1: Conduct comprehensive diagnosis and performance evaluation of old buildings; S2: Make a decision on the structural reinforcement system based on the performance evaluation results to obtain the optimal structural reinforcement system; S3: Based on the optimal structural reinforcement system, reinforce the key components and nodes of the old building; S4: Predictive maintenance of reinforced old buildings through collaborative enhancement and real-time monitoring.
[0008] Preferably, step S1 specifically includes the following steps: S11: Establishing accurate digital models of old buildings through 3D laser scanning and drone oblique photography; S12: Record the building materials, construction methods, decorative details and structural form of old buildings; S13: Test the strength of masonry and concrete using rebound method, ultrasonic rebound combined method, penetration method and core sampling test to obtain material performance data of old buildings; S14: Based on accurate digital models and material performance data, establish a finite element analysis model to conduct static and dynamic analyses of old buildings.
[0009] Preferably, in step S13, the concrete strength is tested by the rebound method to obtain the concrete compressive strength value. Concrete compressive strength Specifically set as follows: ; in, Indicates the survey area number. , and All represent regression coefficients, determined from experimental data. This represents the average rebound value of the test area. This represents the average carbonization depth of the survey area; In step S14, static and dynamic analyses are performed on the old building, with the inter-story drift angle set as the analysis index. Inter-story drift angle Specifically set as follows: ; in, Indicates inter-story displacement. Indicates altitude.
[0010] Preferably, step S2 specifically includes the following steps: S21: Based on the principle of strengthening the toughness of strong nodes and weak components, strengthening the ductility and load-bearing capacity of the structural nodes of old buildings is set as the first priority; S22: Construct a decision matrix based on building type, degree of damage, seismic fortification objectives, functional improvement needs, and cultural heritage protection requirements; S23: Based on the performance evaluation results and priorities, determine the optimal structural reinforcement system in the decision matrix.
[0011] Preferably, step S3 specifically includes the following steps: S31: Strengthening masonry walls with high-performance composite mortar and wire mesh, increasing the shear bearing capacity of the reinforced masonry walls. satisfy: ; ; ; in, This indicates the shear contribution of the original masonry portion. This represents the correction factor. Indicates the shear strength of the masonry. Indicates the cross-sectional area of the masonry. This indicates the shear contribution of the surface reinforcement layer. This indicates the volumetric reinforcement ratio of the wire mesh. Indicates the tensile strength of the steel wire. Indicates the thickness of the surface layer; S32: Strengthening concrete beams, slabs, and columns with carbon fiber fabric; bending moment of the strengthened members. satisfy: ; in, This represents the equilibrium coefficient, which is taken as 1.0 when the concrete strength grade does not exceed C50. Indicates the axial compressive strength of concrete. Indicates the width of the cross section. Indicates the height of the concrete compression zone. Indicates the effective height of the cross-section. Indicates the strength of the reinforcing steel in the compression zone. This indicates the cross-sectional area of the reinforcing steel in the compression zone. This represents the distance from the resultant force point of the compressed reinforcement to the compression edge of the cross-section. This indicates the elastic modulus of carbon fiber cloth. This indicates the allowable tensile strain of the carbon fiber cloth. This indicates the cross-sectional area of the carbon fiber cloth. S33: Design a buckling-restrained brace (BRB).
[0012] Preferably, step S33 specifically includes the following steps: Step 331: Analyze the additional damping ratio and total energy dissipation capacity of each floor of the old building based on the overall structural analysis; Step 332: Determine the location and number of buckling restraint braces (BRBs); Step 333: Calculate the yield capacity of a single buckling-restrained brace (BRB). Yield bearing capacity Specifically set as follows: ; in, This indicates the yield strength of the core steel. This indicates the net cross-sectional area of the core plate; Step 334: Based on the expected maximum inter-story displacement The ultimate deformation capacity of the buckling-restrained BRB was checked.
[0013] Preferably, step S4 specifically includes the following steps: S41: When reinforcing masonry walls, an insulation layer is laid simultaneously to form a structure-insulation integrated wall system. The insulation layer uses graphite polystyrene board or rock wool board. S42: During reinforcement construction, sensors are pre-embedded or installed to establish a long-term structural health monitoring system. The sensors are strain gauges, accelerometers or inclinometers. S43: Monitor key components of reinforced old buildings using a long-term structural health monitoring system. Monitoring indicators include strain, vibration frequency, and tilt. S44: By monitoring changes in data, the structural performance degradation is assessed in real time, enabling predictive maintenance of reinforced old buildings. A system is built based on the above-mentioned reinforcement method. This invention enhances security while also considering energy conservation, environmental protection, and historical preservation. It has significant advantages in terms of data-driven approach, resilience, functional synergy, and intelligent operation and maintenance.
[0014] Therefore, the present invention employs the above-mentioned method for reinforcing old buildings in urban renewal, which has the following beneficial effects: (1) This invention achieves accurate assessment of the current state of old buildings through three-dimensional laser scanning, material performance testing and finite element analysis, providing a scientific basis for reinforcement schemes and avoiding over- or under-reinforcement; (2) Based on the principle of strong nodes and weak components, this invention constructs a decision matrix by combining seismic resistance, function and cultural heritage protection requirements, which improves the overall structural toughness and can take into account both safety and historical protection. (3) The present invention integrates the insulation layer and the sensor simultaneously in the reinforcement process, forming a structure-insulation integrated system and establishing a long-term health monitoring system, thereby realizing energy saving improvement and predictive maintenance. Attached Figure Description
[0015] Figure 1 This is a flowchart of the reinforcement method of the present invention. Detailed Implementation like Figure 1As shown, this invention focuses on the historical blocks in the core urban area dating back to the 1950s for problem diagnosis and reinforcement application. The buildings in this area are mostly brick-concrete structures, with some being reinforced concrete frame structures. With the advancement of urban renewal, these old buildings face problems such as structural aging, insufficient seismic performance, and outdated energy-saving standards, and urgently need reinforcement and functional improvement in order to continue their use value and preserve their historical features.
[0016] The problem diagnosis results are as follows: (1) Insufficient structural safety: Cracks appeared in some walls, concrete carbonization was severe, and the load-bearing capacity of beams and slabs decreased; (2) Seismic performance is substandard: The original structure did not take into account modern seismic fortification requirements, and the joint connections were weak; (3) Poor energy-saving performance: The walls have no insulation layer, resulting in high energy consumption and failing to meet green building standards; (4) High requirements for historical preservation: the facade and decorative details must be preserved during the reinforcement process.
[0017] To address the above problems, this invention provides a method for reinforcing old buildings in urban renewal, comprising the following steps: S1: Conduct comprehensive diagnosis and performance evaluation of old buildings to achieve a full inspection, quantify the current state of the building, provide data support for precise reinforcement, and avoid over-reinforcement or under-reinforcement. Step S1 specifically includes the following steps: S11: Establish a precise digital model of the old building through 3D laser scanning and UAV oblique photogrammetry; the precise digital model is a 3D model obtained from the scanning data, preferably with millimeter-level precision; S12: Record the material performance data of the old building; the material performance data includes building materials, construction methods, decorative details and structural form, to ensure that historical information is preserved to the greatest extent possible during the reinforcement process; Building materials, including materials used in construction; Construction methods refer to the principles and methods of combining and constructing the various components of a building; including foundation engineering, masonry engineering, roofing engineering, and wall engineering. Decorative details include the division and materials of walls and floors, lighting, and furnishings and furniture arrangement; Structural forms include frame structures and shear wall structures; S13: Test the strength of masonry and concrete by rebound method, ultrasonic rebound combined method, penetration method and / or core sampling test to obtain material performance data of old buildings, thereby achieving comprehensive diagnosis; In step S13, the concrete strength is tested using the rebound method to obtain the concrete compressive strength value. Concrete compressive strength Specifically set as follows: ;Formula (1); in, Indicates the survey area number. , and All represent regression coefficients, determined from experimental data. This represents the average rebound value of the test area. This represents the average carbonization depth of the survey area; S14: Based on the accurate digital model and material performance data, a finite element analysis model is established to perform static and dynamic analyses on the old building, thereby obtaining the performance evaluation results. In step S14, static and dynamic analyses are performed on the old building, and the analysis index is set as the inter-story drift angle. Inter-story drift angle Specifically set as follows: ;Formula (2); in, Indicates inter-story displacement. Indicates altitude.
[0018] S2: Make a decision on the structural reinforcement system based on the performance evaluation results to obtain the optimal structural reinforcement system; Step S2 specifically includes the following steps: S21: Based on the principle of strengthening the toughness of strong nodes and weak components, the first priority is to strengthen the ductility and load-bearing capacity of the structural nodes of old buildings to ensure that the structure has better deformation capacity and energy dissipation capacity under disasters. S22: Construct a decision matrix based on building type, degree of damage, seismic fortification objectives, functional improvement needs, and cultural heritage protection requirements as parameters; S23: Based on the performance evaluation results obtained in step S1 and the priorities in S21, determine the optimal structural reinforcement system in the decision matrix of S22.
[0019] S3: Based on the optimal structural reinforcement system, reinforce the key components and nodes of the old building; Step S3 specifically includes the following steps: S31: Strengthening masonry walls with high-performance composite mortar and wire mesh, increasing the shear bearing capacity of the reinforced masonry walls. satisfy: ; ; ;Formula (3); in, This indicates the shear contribution of the original masonry portion. This represents the correction factor. Indicates the shear strength of the masonry. Indicates the cross-sectional area of the masonry. This indicates the shear contribution of the surface reinforcement layer. This indicates the volumetric reinforcement ratio of the wire mesh. Indicates the tensile strength of the steel wire. Indicates the thickness of the surface layer; S32: Strengthening concrete beams, slabs, and columns with carbon fiber fabric; bending moment of the strengthened members. satisfy: ;Formula (4); in, This represents the equilibrium coefficient, which is taken as 1.0 when the concrete strength grade does not exceed C50. Indicates the axial compressive strength of concrete. Indicates the width of the cross section. Indicates the height of the concrete compression zone. Indicates the effective height of the cross-section. Indicates the strength of the reinforcing steel in the compression zone. This indicates the cross-sectional area of the reinforcing steel in the compression zone. This represents the distance from the resultant force point of the compressed reinforcement to the compression edge of the cross-section. This indicates the elastic modulus of carbon fiber cloth. This indicates the allowable tensile strain of the carbon fiber cloth. This indicates the cross-sectional area of the carbon fiber cloth. S33: Design of buckling-restrained brace (BRB). The buckling-restrained brace (BRB) consists of a core element, a restraint element, and a transition section. Under vibration conditions, the core element yields and dissipates energy, while the restraint element ensures that it can only undergo tensile and compressive deformation without buckling.
[0020] In step S33, based on the metal yielding damper, step S33 specifically includes the following steps: Step 331: Analyze the additional damping ratio and total energy dissipation capacity of each floor of the old building based on the overall structural analysis; Step 332: Determine the location and number of buckling restraint braces (BRBs); Step 333: Calculate the yield capacity of a single buckling-restrained brace (BRB). Yield bearing capacity Specifically set as follows: ; in, This indicates the yield strength of the core steel. This indicates the net cross-sectional area of the core plate; Step 4: Based on the expected maximum inter-story displacement The ultimate deformation capacity of the buckling-restrained BRB was checked.
[0021] S4: Through collaborative enhancement and real-time monitoring, predictive maintenance is carried out on reinforced old buildings to ensure the effectiveness of reinforcement and achieve synergistic enhancement of building functions and environment.
[0022] Step S4 specifically includes the following steps: S41: When reinforcing masonry walls, an insulation layer is laid simultaneously to form a structure-insulation integrated wall system. The insulation layer uses graphite polystyrene board or rock wool board. S42: During reinforcement construction, sensors are pre-embedded or installed to establish a long-term structural health monitoring system. The sensors are strain gauges, accelerometers or inclinometers. S43: Monitor key components of the reinforced old building through a long-term structural health monitoring system. The monitoring indicators include strain, vibration frequency, and tilt. S44: By monitoring changes in indicator data, the structural performance degradation is assessed in real time, and predictive maintenance is carried out on the reinforced old buildings. The monitoring results show that the structural safety of the old buildings is significantly improved after reinforcement, the seismic fortification level is improved to meet the requirements of the current code, and the load-bearing capacity of key components is increased by more than 30%; the energy-saving performance is improved, the building energy consumption is reduced by about 25%, and the green building standard is met; the historical features are well preserved, and the facade and decorative details are restored to their original state under digital guidance.
[0023] Therefore, the present invention adopts the above-mentioned method for reinforcing old buildings in urban renewal. Through digital diagnosis and toughness-first reinforcement decision-making, it achieves precise reinforcement and performance improvement of old building structures. Combined with integrated construction and long-term health monitoring, it enhances safety while extending building life and achieving functional synergy. The present invention has been described in detail for the purpose of making the disclosure clearer, and the prior art will not be listed in detail.
[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. It is obvious to those skilled in the art that multiple technical solutions of the present invention can be combined. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. All technical contents not described in detail in the present invention are well-known technologies.
Claims
1. A method for reinforcing old buildings in urban renewal, characterized in that, Includes the following steps: S1: Conduct comprehensive diagnosis and performance evaluation of old buildings; S2: Make a decision on the structural reinforcement system based on the performance evaluation results to obtain the optimal structural reinforcement system; S3: Based on the optimal structural reinforcement system, reinforce the key components and nodes of the old building; S4: Predictive maintenance of reinforced old buildings through collaborative monitoring.
2. The method for reinforcing old buildings in urban renewal according to claim 1, characterized in that, Step S1 specifically includes the following steps: S11: Establish accurate digital models of old buildings through 3D laser scanning and UAV oblique photogrammetry. S12: Record the material performance data of the old building; the material performance data includes building materials, construction methods, decorative details and structural form; Building materials, including materials used in construction; Construction methods refer to the principles and methods of combining and constructing the various components of a building; including foundation engineering, masonry engineering, roofing engineering, and wall engineering. Decorative details include the division and materials of walls and floors, lighting, and furnishings and furniture arrangement; Structural forms include frame structures and shear wall structures; S13: Test the strength of masonry and concrete by rebound method, ultrasonic rebound combined method, penetration method and / or core sampling test to obtain material performance data of old buildings, thereby achieving comprehensive diagnosis; S14: Based on accurate digital models and material performance data, establish a finite element analysis model to conduct static and dynamic analyses on old buildings, thereby obtaining performance evaluation results.
3. The method for reinforcing old buildings in urban renewal according to claim 2, characterized in that, In step S13, the concrete strength is tested using the rebound method to obtain the concrete compressive strength value. Concrete compressive strength Specifically set as follows: Official (1); in, Indicates the survey area number. , and All represent regression coefficients, determined from experimental data. This represents the average rebound value of the test area. This represents the average carbonization depth of the survey area; In step S14, static and dynamic analyses are performed on the old building, with the inter-story drift angle set as the analysis index. Inter-story drift angle Specifically set as follows: Official (2); in, Indicates inter-story displacement. Indicates altitude.
4. The method for reinforcing old buildings in urban renewal according to claim 1, characterized in that, Step S2 specifically includes the following steps: S21: Based on the principle of strengthening the toughness of strong nodes and weak components, strengthening the ductility and load-bearing capacity of the structural nodes of old buildings is set as the first priority; S22: Construct a decision matrix based on building type, degree of damage, seismic fortification objectives, functional improvement needs, and cultural heritage protection requirements as parameters; S23: Based on the performance evaluation results obtained in step S1 and the priorities in S21, determine the optimal structural reinforcement system in the decision matrix of S22.
5. A method for reinforcing old buildings in urban renewal according to claim 1, characterized in that, Step S3 specifically includes the following steps: S31: Strengthening masonry walls with composite mortar and wire mesh to improve the shear bearing capacity of the reinforced masonry walls. satisfy: ； ； Official (3); in, This indicates the shear contribution of the original masonry portion. This represents the correction factor. Indicates the shear strength of the masonry. Indicates the cross-sectional area of the masonry. This indicates the shear contribution of the surface reinforcement layer. This indicates the volumetric reinforcement ratio of the wire mesh. Indicates the tensile strength of the steel wire. Indicates the thickness of the surface layer; S32: Strengthening concrete beams, slabs, and columns with carbon fiber fabric; bending moment of the strengthened members. satisfy: Official (4) in, This represents the equilibrium coefficient, which is taken as 1.0 when the concrete strength grade does not exceed C50. Indicates the axial compressive strength of concrete. Indicates the width of the cross section. Indicates the height of the concrete compression zone. Indicates the effective height of the cross-section. Indicates the strength of the reinforcing steel in the compression zone. This indicates the cross-sectional area of the reinforcing steel in the compression zone. This represents the distance from the resultant force point of the compressed reinforcement to the compression edge of the cross-section. This indicates the elastic modulus of carbon fiber cloth. This indicates the allowable tensile strain of the carbon fiber cloth. This indicates the cross-sectional area of the carbon fiber cloth. S33: Design a buckling-restrained brace (BRB).
6. A method for reinforcing old buildings in urban renewal according to claim 5, characterized in that, In step S33, based on the metal yielding damper, the specific steps include: Step 331: Analyze the additional damping ratio and total energy dissipation capacity of each floor of the old building based on the overall structural analysis; Step 332: Determine the location and number of buckling restraint braces (BRBs); Step 333: Calculate the yield capacity of a single buckling-restrained brace (BRB). Yield bearing capacity Specifically set as follows: ； in, This indicates the yield strength of the core steel. This indicates the net cross-sectional area of the core plate; Step 334: Based on the expected maximum inter-story displacement The ultimate deformation capacity of the buckling-restrained BRB was checked.
7. A method for reinforcing old buildings in urban renewal according to claim 1, characterized in that, Step S4 specifically includes the following steps: S41: When reinforcing masonry walls, an insulation layer is laid simultaneously to form an integrated structural-insulation wall system; the insulation layer uses graphite polystyrene board or rock wool board; S42: During reinforcement construction, sensors should be pre-embedded or installed to establish a long-term structural health monitoring system; the sensors should be strain gauges, accelerometers, or inclinometers. S43: Long-term monitoring of key components of the reinforced old building; monitoring indicators include strain, vibration frequency, and tilt. S44: By monitoring changes in indicator data, the structural performance degradation can be assessed in real time, enabling predictive maintenance of reinforced old buildings.
8. A system, characterized in that; The structure is built based on the reinforcement method described in claim 1.