GB 51367-2019 English PDF
Basic dataStandard ID: GB 51367-2019 (GB51367-2019)Description (Translated English): Standard for design of strengthening steel structure Sector / Industry: National Standard Classification of Chinese Standard: P26 Classification of International Standard: 91.080.10 Word Count Estimation: 161,135 Date of Issue: 2019-11-22 Date of Implementation: 2020-06-01 Quoted Standard: GB 50009; GB 50010; GB 50011; GB 50016; GB 50017; GB/T 50046; GB 50117; GB 50144; GB 50205; GB 50292; GB/T 50448; GB 50550; GB 50661; GB 50728; GB 50936; GB/T 699; GB/T 700; GB/T 1228; GB/T 1229; GB/T 1230; GB/T 1231; GB/T 1499.1; GB/T 1499.2; GB/T 1591 Regulation (derived from): Ministry of Housing and Urban-Rural Development Announcement No. 312 of 2019 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation Summary: This standard applies to the design of steel structure reinforcement for industrial and civil buildings and general structures. GB 51367-2019: Standard for design of strengthening steel structure---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 This standard is formulated in order to make the reinforcement design of steel structures to be technically reliable, safe and applicable, economical and reasonable, and to ensure quality. 1.0.2 This standard applies to the design of steel structure reinforcement for industrial and civil buildings and general structures. 1.0.3 Before the steel structure is strengthened, according to the types of buildings (structures), inspection or appraisal shall be carried out according to the current national standards "Industrial Building Reliability Appraisal Standard" GB 50144 and "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 standards "Code for Seismic Design of Buildings" GB 50011 or "Standards for Seismic Appraisal of Structures" GB 50117. 1.0.4 The design of steel structure reinforcement shall not only comply with this standard, but also comply with the current relevant national standards. 2 Terms and symbols 2.1 Terminology 2.1.1 Strengthening of steel structure Take measures such as reinforcement, partial replacement or adjustment of internal force for steel structures, components and related parts that are not reliable enough or require improved reliability by the property owner, so as to make them meet the current design standards and the safety, applicability and safety required by the property owner. durability. 2.1.2 Existing structure The original structure before reinforcement is also called the structure before reinforcement. 2.1.3 Existing member of the original component The original component before reinforcement is also called the component before reinforcement. 2.1.4 Strengthening of unloading structure Complete unloading of the structure in situ, or reinforcement after dismantling the components. 2.1.5 Strengthening of loading structure In situ reinforcement of a structure after the live load has been removed or partially removed. 2.1.6 nominal stress nominal stress The cross-sectional stress of the member calculated according to the standard or by the general method of material mechanics. 2.1.7 net section net section Section after deduction of voids, corrosion and damage weakening failure. 2.1.8 Expandable crack expandable crack A crack that is likely to increase in length or depth. 2.1.9 Brittle fracture oriented crack brittle fracture oriented crack There are cracks that may cause sudden brittle fracture of steel structures and components. 2.1.10 Friction-type high strength bolt connection friction-type high strength bolt connection Only high-strength bolted connections where forces between the plates are transferred by friction between the plates are considered. 2.1.11 Structural adhesive Adhesives used for the bonding of load-bearing structures or components, which can withstand design stress and environmental effects for a long time, are referred to as structural adhesives. 2.2 Symbols 2.2.1 Action effect M - bending moment; M0——the bending moment of the member before strengthening; N - axial force; N0——the axial force of the member before strengthening; V - shear force; V0——the shear force of the member before strengthening; σ——the maximum stress of the member under all service loads; σ1——Maximum stress of member under service load after deduction of initial load; σ0——the maximum stress of the member under the action of the initial load that cannot be unloaded; σf—perpendicular to the length direction of the fillet weld, the normal stress of the weld calculated according to the effective section of the fillet weld; τ——shear stress; τf — along the length direction of the fillet weld, the shear stress of the weld calculated according to the effective section of the fillet weld. 2.2.2 Calculation indicators E - elastic modulus of steel; f—design value of tensile, compressive and flexural strength of steel; f*——Design value of tensile, compressive and flexural converted strength of steel; fwf—design value of tensile, compressive and shear strength of fillet weld; f0—design value of tensile, compressive and flexural strength of original structural steel; fs—design value of tensile, compressive and flexural strength of reinforcement steel; fv—design value of steel shear strength; fy——Standard value of steel yield strength or yield point; G - shear modulus of steel; NE - Euler's critical force. 2.2.3 Geometric parameters A - Gross cross-sectional area or total cross-sectional area; An - net sectional area; A0 - the gross cross-sectional area of the original component; An0 - the net cross-sectional area of the original member; As—the cross-sectional area of the reinforced part of the member; At - the total cross-sectional area of the member after strengthening, that is, the sum of A0 and As; a - spacing; d - diameter; e0——equivalent eccentricity; he—effective thickness of fillet weld; hf - fillet weld leg size; I——gross section moment of inertia; I0——gross section moment of inertia of the original member; Is——section moment of inertia of the reinforced part of the member; L - length; L0—calculated length of member; Ls——the total length of the continuation of the welding seam of the reinforcement; Lw——weld length; Lws——the length of the actual welding section of the reinforcement weld; W——gross cross-sectional resistance moment; Wn——net section resistance moment; W0n - the net section resistance moment of the original member; t - the thickness of the plate; λ - slenderness ratio; λ0—the relative slenderness ratio of the member; ω—deflection; ω0——initial deflection; ωT—total deflection; ωw—welding residual deflection; △ω—deflection increment. 2.2.4 Calculation coefficient and others t'——calculation coefficient considering the influence of sampling quantity; αN——the bending moment increase coefficient of the compression-bending member; αv——strength correction coefficient of newly added reinforced concrete; βmx, βty—equivalent bending moment coefficients for stability calculation of compression-bending members; γ——section plastic development coefficient; ηm—correction coefficient of strengthening strength of bending members; ηn——correction coefficient of reinforcement strength of axially stressed members; ηv——correction coefficient for the strength of the web of the flexural member bonded to steel; ψf——empirical coefficient; ξ—influence coefficient of welding residual deflection; δ—Continuity coefficient of intermittent weld considering reinforcement; φ——Stability coefficient of axial compression member; φb——The overall stability coefficient of the uniform bending member. 4.5.2 The bonded shear strength standard value of the structural adhesive used for steel structure reinforcement shall have a guarantee rate of not less than 95% determined with a confidence level of 0.90.The safety performance and durability of the structural adhesive used for steel structure reinforcement must meet the requirements in Table 4.5.2-1 and Table 4.5.2-2 respectively. Table 4.5.2-1 Safety Performance Index of Structural Adhesive for Steel Structure Reinforcement Note. All performance indicators in the table are average values except for the standard values marked. Table 4.5.2-2 Durability index of structural adhesive for steel structure reinforcement 4.5.3 The colloid properties of the structural adhesive used for steel structure reinforcement shall meet the requirements in Table 4.5.3. Table 4.5.3 Performance indicators of structural adhesives for steel structure reinforcement Note. All performance indicators in the table are average values except for the standard values marked. 4.5.4 The safety performance of the interface glue, base glue and repair glue used in conjunction with the structural glue for steel structure reinforcement shall comply with the provisions of the current national standard "Technical Specifications for Safety Appraisal of Engineering Structure Reinforcement Materials" GB 50728. 4.6 Concrete and cement-based grouts 4.6.1 The strength grade of concrete used for steel structure reinforcement should not be lower than C30; its durability should meet the requirements of the current national standard "Code for Design of Concrete Structures" GB 50010. 4.6.2 Commercial concrete can be used as concrete for steel structure reinforcement. When fly ash is added to the concrete, the fly ash should be Class I ash, and the loss on ignition should not exceed 5%. 4.6.3 The polymer concrete, micro-expansion concrete, steel fiber concrete, synthetic fiber concrete and shotcrete used for steel structure reinforcement shall be trial-mixed before the construction of the project, and can be used only after the performance of the test meets the design requirements. 4.6.4 The performance and quality of cement-based grouting materials for steel structure reinforcement shall comply with the provisions of the current national standard "Technical Specifications for the Application of Cement-based Grouting Materials" GB/T 50448; Quality acceptance specification "GB 50550 provisions. 4.7 Anti-corrosion and fire-proof coating materials 4.7.1 The coating materials used for anti-corrosion and anti-rust of steel structure, the derusting level of steel surface and the effect of anti-corrosion on steel... ...... |
