1 General provisions
1.0.1 This standard is formulated with a view to implementing the technical and economic policies of the nation during the design of steel structures and thus achieving advanced technology, safety and applicability, economic rationality and guaranteed quality.
1.0.2 This standard is applicable to the design of steel structures in industrial and civil buildings and general structures.
1.0.3 In addition to this standard, the design of steel structures shall also comply with those stipulated in the current relevant standards of the nation.
2 Terms and symbols
2.1 Terms
2.1.1 brittle fracture
sudden fracture of a structure or member subject to tensile stress without any alarming plastic deformation
2.1.2 first-order elastic analysis
analysis of the internal force and displacement of a structure according to the elastic stage by constructing the equilibrium condition based on undeformed structure, taking no account of the effect of geometric nonlinearity on the internal force and deformation of the structure
2.1.3 second-order P-Δ elastic analysis
analysis of the internal force and displacement of a structure according to the elastic stage by constructing the equilibrium condition based on structure after displacement, only taking account of the effects of its overall initial imperfections and geometric nonlinearity of the structure on its internal force and deformation
2.1.4 direct analysis method of design
a design method of conducting second-order nonlinear analysis with the whole structural system as the object, directly taking account of the factors such as initial geometric imperfections, residual stress, material nonlinearity and joint connection stiffness that have significant effects on the stability and strength performance of the structure
2.1.5 buckling
a state of steel structure, member or plate having another larger deformation in the direction with weaker stiffness at the time of reaching the critical stress state
2.1.6 post-buckling strength of steel plate
capacity of a steel plate to bear greater load after buckling
2.1.7 normalized slenderness ratio
a parameter, which is equal to the square root of the quotient of the yield strength of steel in flexion, shear or compression and the corresponding elastic buckling stress of member or steel plate in flexion, shear or compression
2.1.8 overall stability
capacity of a member or structure to remain stable overall under load
2.1.9 effective width
reduced width obtained by equivalently processing the width of the steel plate subject to non-uniformly distributed ultimate stress with the uniformly distributed yield stress in the calculation of the post-buckling ultimate strength of steel plate
2.1.10 effective width factor
ratio of the effective width to the actual width of a steel plate
2.1.11 effective length ratio
a factor, which is related to the buckling mode and the rotational constraints at both ends of the member
2.1.12 effective length
length used in the calculation of stability, which is equal to the product of the geometric length of the member between its effective constraint points and its effective length ratio
2.1.13 slenderness ratio
ratio of the effective length to the gyration radius of section of a member
2.1.14 equivalent slenderness ratio
corresponding slenderness ratio when the latticed member is converted to solid web member or instability caused by the flexural-torsional buckling and torsional bucking are converted to that caused by flexural bucking in the overall stability calculation of axial compression member
2.1.15 nodal bracing force
lateral force applied on the lateral bracing set for reducing the free length of compression member (or compression flange of member), in the buckling direction of the braced member (or the compression flange of member)
2.1.16 unbraced frame
a structure with resistance to load by the bending resistance of joints and members
2.1.17 bracing structure
a structure with resistance to lateral load by the axial stiffness of the bracing member obliquely arranged in the plane where the beam-column member is located
2.1.18 frame-bracing structure
a structure of lateral resistant system composed of frame and bracing
2.1.19 frame braced with strong bracing system
a frame braced with the bracing structure (bracing truss, shear wall, tube, etc.) of relatively large lateral stiffness in the frame-bracing structure, adequate to be regarded as frame without lateral displacement
2.1.20 leaning column
a column designed to bear axial force only, taking no account of the lateral stiffness
2.1.21 panel zone
zone provided with stiffener or diaphragm at the rigid joint and the upper and lower sides of column web of frame beam and column within the height scope of beam
2.1.22 spherical steel bearing
hinged bearing or movable bearing with the steel spherical surface as the bearing surface, allowing the structure to rotate in any direction at the bearing
2.1.23 steel-plate shear wall
steel plate arranged between the frame beam and column to withstand the horizontal shear in the frame
2.1.24 chord member
tubular member, e.g., a chord in truss, placed continuously at the joint in steel tubular structural member
2.1.25 brace member
tubular member, e.g., web member connected to the chord member in truss, disconnected at the joint and connected to the chord member in steel tubular structure
2.1.26 gap joint
tubular joint where the toes of two brace members are distant from each other by a gap
2.1.27 overlap joint
steel tubular joint where the two brace members are overlapped each other
2.1.28 uniplanar joint
joint where brace member and chord member are connected together in the same plane
2.1.29 multiplanar joint
tubular joint formed by connecting multiple brace members in different planes to the chord member
2.1.30 welded section
a section made of steel plate (or profile steel) by welding
2.1.31 composite steel and concrete beam
a beam formed by the composite of concrete flange plate and steel beam via shear connector and capable of bearing force as a whole
2.1.32 bracing system
a lateral force resisting system consisting of bracing, beam (including foundation beam) and column transferring the internal force
2.1.33 link
a beam section between two diagonal bracing ends or between one diagonal bracing end and the column in a eccentrically braced frame structure
2.1.34 concentrically braced frame
a frame in which the diagonal bracing and the frame beam and column intersect at a point
2.1.35 eccentrically braced frame
a frame in which at least one end of the diagonal bracing is connected with the cross beam outside the beam-column joint
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 General design requirements
3.1 General requirements
3.2 Structural systems
3.3 Actions
3.4 Requirements of deformation and comfort degree for structures and members
3.5 Classification of sections
4 Materials
4.1 Steel grades and standards
4.2 Models and standards of connection and fastener materials
4.3 Selection of materials
4.4 Design strength and parameters
5 Structural analysis and stability design
5.1 General requirements
5.2 Initial imperfections
5.3 First-order elastic analysis and design
5.4 Second-order P-Δ elastic analysis and design
5.5 Direct analysis method of design
6 Flexural members
6.1 Shear and flexural strength of flexural members
6.2 Overall stability of flexural members
6.3 Local stability
6.4 Calculation of beams considering post-buckling strength of webs
6.5 Strengthening of openings
6.6 Detailing requirements of beam
7 Axially loaded members
7.1 Strength calculation of cross-sections
7.2 Stability calculation of axial compression members
7.3 Local stability and post-buckling strength of solid-web axial compression members
7.4 Effective length and allowable slenderness ratio of axially loaded members
7.5 Bracing of axial compression members
7.6 Single angle steel of single-side connection
8 Tension-flexure members and bending members
8.1 Strength calculation of cross-sections
8.2 Stability calculation of members
8.3 Effective length of frame columns
8.4 Local stability and post-buckling strength of bending members
8.5 Truss members subjected to second-order moments
9 Stiffened steel-plate shear walls
9.1 General requirements
9.2 Calculation of stiffened steel-plate shear wall
9.3 Detailing requirements
10 Plastic and moment redistribution design
10.1 General requirements
10.2 Provisions for design using moment redistribution
10.3 Calculation of members
10.4 Slenderness ratio limitations and detailings
11 Connections
11.1 General requirements
11.2 Calculation of welded connections
11.3 Detailing requirements of welded connections
11.4 Calculation of fastener connections
11.5 Detailing requirements of fastener connections
11.6 Pin connections
11.7 Detailings of flanged connections for steel tubes
12 Joints
12.1 General requirements
12.2 Connecting plate joints
12.3 Beam-column joints
12.4 Cast steel joints
12.5 Pre-stressed cable joints
12.6 Bearings
12.7 Column footing
13 Steel tubular joints
13.1 General requirements
13.2 Detailing requirements
13.3 Calculation of circular steel tubular directly-welded joints and local stiffened joints
13.4 Calculation of rectangular tubular directly-welded joints and local stiffened joints
14 Composite steel and concrete beams
14.1 General requirements
14.2 Design of composite beams
14.3 Calculation for shear connector
14.4 Calculation of deflection
14.5 Calculation of concrete crack width at hogging moment region
14.6 Calculation of longitudinal shear
14.7 Detailing requirements
15 Concrete-filled steel tubular column and joints
15.1 General requirements
15.2 Rectangular concrete-filled steel tubular columns
15.3 Circular concrete-filled steel tubular columns
15.4 Joint of concrete-filled steel tubular column and steel beam
16 Fatigue calculation and design for brittle fracture
16.1 General requirements
16.2 Fatigue calculation
16.3 Detailing requirements
16.4 Design for brittle fracture
17 Seismic design of steel structural members
17.1 General requirements
17.2 Calculation points
17.3 Basic seismic measures
18 Protection of steel structures
18.1 Fire-resistance design
18.2 Corrosion prevention design
18.3 Temperature insulation
Annex A Common structural systems
Annex B Allowable deformation of structures and members
Annex C Overall stability coefficient of beam
Annex D Stability coefficient of axial compression members
Annex E Effective length ratios of columns
Annex F Elastic buckling critical stress for stiffened steel shear walls
Annex G Calculation of stability of truss connecting plate under the compression of diagonal web member
Annex H Determination of stiffness of direct welded joints of unstiffened steel tubes
Annex J Fatigue checking calculation of composite steel and concrete beams
Annex K Classification of members and connections that are subjected to fatigue calculation
Explanation of wording in this standard
List of quoted standards
1 General provisions
1.0.1 This standard is formulated with a view to implementing the technical and economic policies of the nation during the design of steel structures and thus achieving advanced technology, safety and applicability, economic rationality and guaranteed quality.
1.0.2 This standard is applicable to the design of steel structures in industrial and civil buildings and general structures.
1.0.3 In addition to this standard, the design of steel structures shall also comply with those stipulated in the current relevant standards of the nation.
2 Terms and symbols
2.1 Terms
2.1.1 brittle fracture
sudden fracture of a structure or member subject to tensile stress without any alarming plastic deformation
2.1.2 first-order elastic analysis
analysis of the internal force and displacement of a structure according to the elastic stage by constructing the equilibrium condition based on undeformed structure, taking no account of the effect of geometric nonlinearity on the internal force and deformation of the structure
2.1.3 second-order P-Δ elastic analysis
analysis of the internal force and displacement of a structure according to the elastic stage by constructing the equilibrium condition based on structure after displacement, only taking account of the effects of its overall initial imperfections and geometric nonlinearity of the structure on its internal force and deformation
2.1.4 direct analysis method of design
a design method of conducting second-order nonlinear analysis with the whole structural system as the object, directly taking account of the factors such as initial geometric imperfections, residual stress, material nonlinearity and joint connection stiffness that have significant effects on the stability and strength performance of the structure
2.1.5 buckling
a state of steel structure, member or plate having another larger deformation in the direction with weaker stiffness at the time of reaching the critical stress state
2.1.6 post-buckling strength of steel plate
capacity of a steel plate to bear greater load after buckling
2.1.7 normalized slenderness ratio
a parameter, which is equal to the square root of the quotient of the yield strength of steel in flexion, shear or compression and the corresponding elastic buckling stress of member or steel plate in flexion, shear or compression
2.1.8 overall stability
capacity of a member or structure to remain stable overall under load
2.1.9 effective width
reduced width obtained by equivalently processing the width of the steel plate subject to non-uniformly distributed ultimate stress with the uniformly distributed yield stress in the calculation of the post-buckling ultimate strength of steel plate
2.1.10 effective width factor
ratio of the effective width to the actual width of a steel plate
2.1.11 effective length ratio
a factor, which is related to the buckling mode and the rotational constraints at both ends of the member
2.1.12 effective length
length used in the calculation of stability, which is equal to the product of the geometric length of the member between its effective constraint points and its effective length ratio
2.1.13 slenderness ratio
ratio of the effective length to the gyration radius of section of a member
2.1.14 equivalent slenderness ratio
corresponding slenderness ratio when the latticed member is converted to solid web member or instability caused by the flexural-torsional buckling and torsional bucking are converted to that caused by flexural bucking in the overall stability calculation of axial compression member
2.1.15 nodal bracing force
lateral force applied on the lateral bracing set for reducing the free length of compression member (or compression flange of member), in the buckling direction of the braced member (or the compression flange of member)
2.1.16 unbraced frame
a structure with resistance to load by the bending resistance of joints and members
2.1.17 bracing structure
a structure with resistance to lateral load by the axial stiffness of the bracing member obliquely arranged in the plane where the beam-column member is located
2.1.18 frame-bracing structure
a structure of lateral resistant system composed of frame and bracing
2.1.19 frame braced with strong bracing system
a frame braced with the bracing structure (bracing truss, shear wall, tube, etc.) of relatively large lateral stiffness in the frame-bracing structure, adequate to be regarded as frame without lateral displacement
2.1.20 leaning column
a column designed to bear axial force only, taking no account of the lateral stiffness
2.1.21 panel zone
zone provided with stiffener or diaphragm at the rigid joint and the upper and lower sides of column web of frame beam and column within the height scope of beam
2.1.22 spherical steel bearing
hinged bearing or movable bearing with the steel spherical surface as the bearing surface, allowing the structure to rotate in any direction at the bearing
2.1.23 steel-plate shear wall
steel plate arranged between the frame beam and column to withstand the horizontal shear in the frame
2.1.24 chord member
tubular member, e.g., a chord in truss, placed continuously at the joint in steel tubular structural member
2.1.25 brace member
tubular member, e.g., web member connected to the chord member in truss, disconnected at the joint and connected to the chord member in steel tubular structure
2.1.26 gap joint
tubular joint where the toes of two brace members are distant from each other by a gap
2.1.27 overlap joint
steel tubular joint where the two brace members are overlapped each other
2.1.28 uniplanar joint
joint where brace member and chord member are connected together in the same plane
2.1.29 multiplanar joint
tubular joint formed by connecting multiple brace members in different planes to the chord member
2.1.30 welded section
a section made of steel plate (or profile steel) by welding
2.1.31 composite steel and concrete beam
a beam formed by the composite of concrete flange plate and steel beam via shear connector and capable of bearing force as a whole
2.1.32 bracing system
a lateral force resisting system consisting of bracing, beam (including foundation beam) and column transferring the internal force
2.1.33 link
a beam section between two diagonal bracing ends or between one diagonal bracing end and the column in a eccentrically braced frame structure
2.1.34 concentrically braced frame
a frame in which the diagonal bracing and the frame beam and column intersect at a point
2.1.35 eccentrically braced frame
a frame in which at least one end of the diagonal bracing is connected with the cross beam outside the beam-column joint
Contents of GB 50017-2017
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 General design requirements
3.1 General requirements
3.2 Structural systems
3.3 Actions
3.4 Requirements of deformation and comfort degree for structures and members
3.5 Classification of sections
4 Materials
4.1 Steel grades and standards
4.2 Models and standards of connection and fastener materials
4.3 Selection of materials
4.4 Design strength and parameters
5 Structural analysis and stability design
5.1 General requirements
5.2 Initial imperfections
5.3 First-order elastic analysis and design
5.4 Second-order P-Δ elastic analysis and design
5.5 Direct analysis method of design
6 Flexural members
6.1 Shear and flexural strength of flexural members
6.2 Overall stability of flexural members
6.3 Local stability
6.4 Calculation of beams considering post-buckling strength of webs
6.5 Strengthening of openings
6.6 Detailing requirements of beam
7 Axially loaded members
7.1 Strength calculation of cross-sections
7.2 Stability calculation of axial compression members
7.3 Local stability and post-buckling strength of solid-web axial compression members
7.4 Effective length and allowable slenderness ratio of axially loaded members
7.5 Bracing of axial compression members
7.6 Single angle steel of single-side connection
8 Tension-flexure members and bending members
8.1 Strength calculation of cross-sections
8.2 Stability calculation of members
8.3 Effective length of frame columns
8.4 Local stability and post-buckling strength of bending members
8.5 Truss members subjected to second-order moments
9 Stiffened steel-plate shear walls
9.1 General requirements
9.2 Calculation of stiffened steel-plate shear wall
9.3 Detailing requirements
10 Plastic and moment redistribution design
10.1 General requirements
10.2 Provisions for design using moment redistribution
10.3 Calculation of members
10.4 Slenderness ratio limitations and detailings
11 Connections
11.1 General requirements
11.2 Calculation of welded connections
11.3 Detailing requirements of welded connections
11.4 Calculation of fastener connections
11.5 Detailing requirements of fastener connections
11.6 Pin connections
11.7 Detailings of flanged connections for steel tubes
12 Joints
12.1 General requirements
12.2 Connecting plate joints
12.3 Beam-column joints
12.4 Cast steel joints
12.5 Pre-stressed cable joints
12.6 Bearings
12.7 Column footing
13 Steel tubular joints
13.1 General requirements
13.2 Detailing requirements
13.3 Calculation of circular steel tubular directly-welded joints and local stiffened joints
13.4 Calculation of rectangular tubular directly-welded joints and local stiffened joints
14 Composite steel and concrete beams
14.1 General requirements
14.2 Design of composite beams
14.3 Calculation for shear connector
14.4 Calculation of deflection
14.5 Calculation of concrete crack width at hogging moment region
14.6 Calculation of longitudinal shear
14.7 Detailing requirements
15 Concrete-filled steel tubular column and joints
15.1 General requirements
15.2 Rectangular concrete-filled steel tubular columns
15.3 Circular concrete-filled steel tubular columns
15.4 Joint of concrete-filled steel tubular column and steel beam
16 Fatigue calculation and design for brittle fracture
16.1 General requirements
16.2 Fatigue calculation
16.3 Detailing requirements
16.4 Design for brittle fracture
17 Seismic design of steel structural members
17.1 General requirements
17.2 Calculation points
17.3 Basic seismic measures
18 Protection of steel structures
18.1 Fire-resistance design
18.2 Corrosion prevention design
18.3 Temperature insulation
Annex A Common structural systems
Annex B Allowable deformation of structures and members
Annex C Overall stability coefficient of beam
Annex D Stability coefficient of axial compression members
Annex E Effective length ratios of columns
Annex F Elastic buckling critical stress for stiffened steel shear walls
Annex G Calculation of stability of truss connecting plate under the compression of diagonal web member
Annex H Determination of stiffness of direct welded joints of unstiffened steel tubes
Annex J Fatigue checking calculation of composite steel and concrete beams
Annex K Classification of members and connections that are subjected to fatigue calculation
Explanation of wording in this standard
List of quoted standards
