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GB 50367-2013: Code for design of strengthening concrete structure
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GB 50367-2013: Code for design of strengthening concrete structure

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1 General 1.0.1 This specification is formulated in order to make the reinforcement of concrete structures to be technically reliable, safe and applicable, economical and reasonable, and to ensure quality. 1.0.2 This code is applicable to the design of reinforced concrete structure reinforcement of buildings and general structures. 1.0.3 Before the concrete structure is strengthened, according to the type of the building, the structural inspection or appraisal shall be carried out in accordance with the current national standard "Industrial Building Reliability Appraisal Standard" GB 50144 or "Civil Building Reliability Appraisal Standard" GB 50292 respectively. When it is combined with seismic reinforcement, the seismic capacity appraisal should be carried out according to the current national standard "Building Seismic Appraisal Standard" GB 50023 or "Industrial Structure Seismic Appraisal Standard" GB J 117. 1.0.4 The design of reinforcement of concrete structures shall not only comply with the provisions of this code, but also comply with the relevant current national standards. 2 Terms and symbols 2.1 Terminology 2.1.1 Strengthening of structure Measures such as reinforcement, partial replacement or adjustment of internal force shall be taken for load-bearing structures, components and related parts that are not reliable enough or required to be improved by the owner, so as to make them meet the current design specifications and the safety, durability and applicability required by the owner. 2.1.2 Existing structure member The original components before reinforcement. 2.1.3 important structure important structure Load-bearing structures in buildings with a safety rating of one. 2.1.4 general structure general structure Load-bearing structures in buildings with safety class II. 2.1.5 important structure member A load-bearing member whose failure by itself will affect or endanger the overall operation of the load-bearing structural system. 2.1.6 general structure member Its own failure is an isolated event and does not affect the load-bearing member of the overall work of the load-bearing structural system. 2.1.7 Structure member strengthening with increasing section area It is a direct reinforcement method that increases the cross-sectional area of the original member and adds reinforcement to increase its bearing capacity and stiffness, or change its natural frequency. 2.1.8 Structure member strengthening with externally wrapped shaped steel For reinforced concrete beams, columns wrapped with section steel and steel panels, the reinforcement method is used to achieve joint stress and restrain the original components. 2.1.9 composite section reinforcement method structure member strengthening with externally bonded reinforced material By using structural adhesive bonding or high-strength polymer modified cement mortar (hereinafter referred to as polymer mortar) spraying, the reinforcing material is bonded to the concrete surface of the original component to form a composite section with integrity to improve its bearing capacity. A direct reinforcement method for strength and ductility. According to the different reinforcing materials, it can be divided into various reinforcement methods such as externally bonded section steel, externally bonded steel plate, externally bonded fiber reinforced composite material, and additional steel wire mesh-polymer mortar surface layer. 2.1.10 Structure member strengthening with wire wrapped This method is a direct reinforcement method that binds the reinforced concrete of the compression member by winding annealed steel wire, thereby improving its ultimate bearing capacity and ductility. 2.1.11 External prestressing reinforcement method structure member strengthening with externally applied compressing An indirect reinforcement method that improves or adjusts the stress of the original structure and components by applying external prestress. 2.1.12 Embedded steel bar It is one of the post-anchoring connection methods of planting ribbed steel bars or fully threaded screws in base concrete with special structural adhesives. 2.1.13 Structural adhesive Adhesives used for the bonding of load-bearing structural components that can withstand design stress and environmental effects for a long time, referred to as structural adhesives. 2.1.14 Fiber reinforced polymer (FRP) High-strength continuous fibers are arranged according to certain rules, and are impregnated with adhesives, bonded and cured to form composite materials with fiber-reinforced effects, commonly known as fiber composites. 2.1.15 polymer modified cement mortar Cement mortar formulated with high molecular polymer as a modified material to enhance bonding performance. In addition to improving its own physical and mechanical properties, polymer-modified cement mortar for load-bearing structures should also significantly improve its ability to anchor steel bars and bond concrete. 2.1.16 Effective cross-sectional area effective cross-sectional area The cross-section after deducting the weakened and failed parts such as holes, defects, rust layers, and weathered layers. 2.1.17 design working life for strengthening of existing structure or its member The time during which the structures and components specified in the reinforcement design can be used according to their intended purpose without re-inspection and appraisal after reinforcement. 2.2 Symbols 2.2.1 Material properties Es0——Elastic modulus of the steel bar of the original member; Es - elastic modulus of newly added reinforcement; Ea - modulus of elasticity of newly added steel; Esp——new elastic modulus of steel plate; Ef—the elastic modulus of newly added fiber composite; c0——the design value of the concrete axial compressive strength of the original member; y0, ′y0——Design value of tensile strength and compressive strength of steel bar of original member; y, ′y—design values of tensile and compressive strength of newly added reinforcement; a, ′a—design value of tensile and compressive strength of newly added steel; sp, ′sp——new design values of steel plate tensile and compressive strength; f - the design value of the tensile strength of the newly added fiber composite material; f, v—design value of bond strength between fiber composite material and concrete; bd—design value of bond strength of structural adhesive; ud—design value of tensile strength of anchor bolt; εf—design value of tensile strain of fiber composite material; εfe—design value of effective tensile strain of fiber composite hoop enclosure. 2.2.2 Action effect and bearing capacity M - the design value of the bending moment after the component is strengthened; M0k——Standard value of the initial bending moment of the original action on the checked section of the flexural member before strengthening; N—design value of axial force after component strengthening; V—design value of shear force after component reinforcement; σs——the tensile stress of the newly added longitudinal reinforcement; σs0——the stress of the longitudinal tensile reinforcement or the smaller compression side reinforcement of the original member; σa——the stress of the newly-added section steel in tension or compression; εf0—hysteresis strain of fiber composite; ω——member deflection or prestressed anti-camber. 2.2.3 Geometric parameters As0, A's0——the cross-sectional area of the steel bar in the tension zone and compression zone of the original member; As, A's - the cross-sectional area of the reinforcement in the tension zone and compression zone of the newly added member; Afe—effective cross-sectional area of fiber composite; Acor—concrete cross-sectional area in the circumferential enclosure; Asp, A'sp—the cross-sectional area of steel plate under tension and steel plate under compression; Aa, A'a——the cross-sectional area of the tension and compression limbs of newly added steel; D - drilling diameter; h0, h01—the effective height of the cross-section of the member after reinforcement and before reinforcement; hw—web height of member section; hn—the replacement depth of concrete in the compression zone; hsp——the vertical height of the steel hoop on the side of the beam; hf——the vertical height of the fiber hoop plate pasted on the side of the beam; hef—the effective anchoring depth of the anchor bolt; ls——Basic anchorage depth of planted bar; ld—design value of the anchorage depth of planting bar; ll—— Lap length of planted reinforcement under tension. 2.2.4 Calculation coefficients α1——the ratio of the stress value of the concrete rectangular stress diagram in the compression zone to the design value of the concrete axial compressive strength; αc—additional concrete strength utilization coefficient; αs——additional reinforcement strength utilization factor; αa——the strength utilization factor of newly added section steel; αsp——calculation coefficient quoted to prevent concrete splitting; βc—influence coefficient of concrete strength; β1——the ratio of the height of the compression zone of the rectangular stress diagram to the height of the neutral axis; ψ——reduction coefficient, correction coefficient or influence coefficient; η—increase coefficient or increase coefficient.

3 Basic Regulations

3.1 General provisions 3.1.1 When the concrete structure needs to be reinforced after the reliability appraisal, the reinforcement design shall be carried out according to the provisions of this code and the requirements of the owner according to the conclusion of the appraisal and the requirements of the entrusting party. The scope of reinforcement design can be determined according to the whole building or an independent section, or according to the specified structure, component or connection, but the overall firmness of the structure should be considered. 4.2 Steel and welding consumables 4.2.1 The type, quality and performance of steel bars used for strengthening concrete structures shall meet the following requirements. 1 HRB335 or HPB300 ordinary steel bars should be used; when there is engineering experience, HRB400 steel bars can be used; HRB500 and HRBF500 steel bars can also be used. For external prestressed reinforcement, UPS15.2-1860 low-relaxation unbonded steel strands should be used. 2 The quality of steel bars and steel strands shall comply with the current national standards "Steel for Reinforced Concrete Part 1.Hot-rolled Plain Steel Bars" GB 1499.1, "Steel for Reinforced Concrete Part 2.Hot-rolled Ribbed Steel Bars" GB 1499.2 and The provisions of JG 161 of "Unbonded Prestressed Steel Strand". 3 The standard value and design value of steel bar performance shall be adopted in accordance with the provisions of the current national standard "Code for Design of Concrete Structures" GB 50010. 4 Do not use steel bars and regenerated steel bars that have no factory certificates, no Chinese marks, or have not been inspected in the field. 4.2.2 The type, quality and performance of steel plates, section steels, flat steels and steel pipes used for strengthening concrete structures shall meet the following requirements. 1 Grade Q235 or Q345 steel shall be used; for welded components of important structures, when Q235 grade steel is used, Q235-B grade steel shall be selected; 2 The quality of the steel should meet the current national standards "Carbon Structural Steel" GB/T 700 and "Low Alloy High Strength Structural Steel" GB/T 1591 respectively; 3 The performance design value of the steel shall be adopted in accordance with the provisions of the current national standard "Code for Design of Steel Structures" GB 50017; 4 It is not allowed to use steel without factory certificate, without Chinese mark or without entry inspection. 4.2.3 When the rear anchor of the concrete structure is planted bars, hot-rolled ribbed bars should be used instead of plain round bars. The quality of steel bars used for planting bars shall meet the requirements of Article 4.2.1 of this code. 4.2.4 When the rear anchor is a steel screw, a screw with full threads shall be used, and a screw without threads in the anchoring part shall not be used. The steel grade of the screw should be Q345 or Q235; its quality should meet the current national standards "Low Alloy High Strength Structural Steel" GB/T 1591 and "Carbon Structural Steel" GB/T 700 respectively. 4.2.5 When the rear anchor of the load-bearing structure is an anchor bolt, the performance index of its steel must meet the requirements in Table 4.2.5-1 or Table 4.2.5-2. Table 4.2.5-1 Steel Tensile Performance Index of Carbon Steel and Alloy Steel Anchor Bolts Note. Performance level 4.8 means. stk=400MPa; yk/stk=0.8. Table 4.2.5-2 Steel performance indicators of stainless steel anchor bolts (austenite A1, A2, A4, A5) 4.2.6 The type and quality of welding consumables used for strengthening concrete structures shall meet the following requirements. 1 The type of electrode should be compatible with the strength of the steel to be welded; 2 The quality of welding rods should meet the current national standards GB/T 5117 of "Non-alloy Steel and Fine Grain Steel Welding Rods" and GB/T 5118 of "Heat Resistant Steel Welding Rods"; 3 The welding process shall comply with the provisions of the current national standard "Code for Welding of Steel Structures" GB 50661 and the current industry standard "Regulations for Welding and Acceptance of Reinforcement Bars" JGJ 18; 4 The design principles and calculation indicators of welded joints shall comply with the provisions of the current national standard "Code for Design of Steel Structures" GB 50017. 4.3 Fibers and fiber composites 4.3.1 The fibers of fiber composite materials must be continuous fibers, and their types and quality should meet the following requirements. 1 The carbon fibers used for the reinforcement of load-bearing structures should be small tow fibers with polyacrylonitrile base not greater than 15K. 2 The aramid fiber used for reinforcement of the load-bearing structure shall be a para-aramid filament fiber with a saturated water absorption rate not greater than 4.5%. And after artificial weathering for 5000h, the creep value under 1000MPa stress should not be greater than 0.15mm. 3 The glass fiber used for reinforcement of the load-bearing structure should be high-strength glass fiber, alkali-resistant glass fiber or alkali-free glass fiber with an alkali metal oxide content of less than 0.8%. It is strictly forbidden to use high-alkali glass fiber and medium-alkali glass fiber. 4 For load-bearing structure reinforcement projects, it is strictly forbidden to use fiber fabrics produced by prepreg 4.3.2 The safety performance of fiber composite materials used for structural reinforcement must comply with the provisions of the current national standard "Technical Specifications for Safety Appraisal of Engineering Structure Reinforcement Materials" GB 50728. 4.3.3 The standard value of tensile strength of fiber composite materials shall be determined according to the requirements of a confidence level of 0.99 and a guarantee rate of 95%. The standard values of tensile strength of different types of fiber composite materials shall be adopted according to the provisions in Table 4.3.3 Table 4.3.3 Standard values of tensile strength of fiber composite materials 4.3.4 The design values of tensile strength of different fiber composite materials shall be adopted according to Table 4.3.4-1, Table 4.3.4-2 and Table 4.3.4-3 respectively. Table 4.3.4-1 Design value of tensile strength of carbon fiber composite material (MPa) Note. The L-shaped plate is adopted according to the design value of the high-strength grade II strip plate. Table 4.3.4-2 Aramid Fiber Composite Material Tensile Strength Design Value (MPa) Table 4.3.4-3 Design value of tensile strength of glass fiber composite material (MPa) 4.3.5 The design values of elastic modulus and tensile strain of fiber composite materials shall be adopted according to Table 4.3.5. Table 4.3.5 Design values of elastic modulus and tensile strain of fiber composites 4.3.6 For fiber fabric composites or fiber composite panels that meet the safety requirements, when used together with other structural adhesives, the standard value of tensile strength, normal tensile bond strength between fiber composites and concrete and interlayer shear Intensity is re-tested for suitability. 4.3.7 When the load-bearing structure adopts fiber fabric composite material for on-site reinforcement, the mass per unit area of the fabric shall meet the requirements in Table 4.3.7. Table 4.3.7 Weight limit per unit area of different types of fiber composite materials (g/m2) 4.3.8 When performing material performance inspection and reinforcement design, the calculation of cross-sectional area of fiber composite materials shall comply with the following regulations. 1 The fiber fabric shall be calculated according to the net cross-sectional area of the fiber. The net cross-sectional area is taken as the calculated thickness of the fabric multiplied by the width. The calculated thickness of the fiber fabric shall be determined by dividing its mass per unit area by the fiber density. The fiber density should be provided by the manufacturer, and a sampling test certificate from an independent inspection or identification agency should be issued. 2 The unidirectional fiber preformed board shall be calculated according to the cross-sectional area of the board without deducting the resin volume, that is, the measured board thickness shall be multiplied by the width. 4.4 Adhesives for structural reinforcement 4.4.1 Adhesives for load-bearing structures should be divided into A-grade adhesives and B-grade adhesives according to their basic properties; ...