1.0.1 This standard is formulated with a view to implementing the national technical and economic policies in the design and construction of space frame structure and making the design to be of advanced technology, safety and usability, economy and rationality and high quality.
1.0.2 This standard is applicable to the design and construction of space frame structure composed of steel members, including space truss, single layer or double-layer latticed shell and spatial truss.
1.0.3 In the design of space frame structure, the reasonable structure scheme, frame / grid layout and structure measures shall be selected according to the actual situation and the comprehensive consideration shall be taken for material supply, processing fabrication and onsite construction, to ensure better technical and economic effects.
1.0.4 Suspended crane shall not be arranged for single-layer latticed shell structure. Space truss and double-layer latticed shell structures may directly withstand the suspended crane load at Level A3 or higher level. In case the cycle times of the stress variation is larger than or equal to 5×104, the fatigue analysis shall be conducted, and the allowable stress amplitude and the structure shall be determined by special test.
1.0.5 The design and construction of space frame structure shall comply with the requirements in the current relevant national standards besides this standard.
2 Terms and Symbols
2.1 Terms
2.1.1 Space grid structure, space frame, space latticed structure
Spatial structure formed of member and member bar arranged in a certain rule by joint connection, including space truss, curved latticed shell and spatial truss
2.1.2 Space truss, space grid
Flat plate type or slight curved spatial trussing structure formed of member bars arranged in a certain rule by joint connection, mainly bearing the integral bending internal force
2.1.3 Intersecting lattice truss system
System formed of two-way or three-way intersecting lattice trusses
2.1.4 Square pyramid system
System formed of square pyramids as basic unit
2.1.5 Triangular pyramid system
System formed of triangular pyramids as basic unit
2.1.6 Composite space truss
Flat lattice truss structure formed by reinforced concrete slab as upper chord member and steel web member and bottom chord bar
2.1.7 Latticed shell, reticulated shell
Curved spatial trussing structure or beam structure formed of member bars arranged in a certain rule by joint connection, mainly bearing the integral thin film internal force
2.1.8 Spherical latticed shell, braced dome
Single-layer or double-layer latticed shell structure with spherical appearance
2.1.9 Cylindrical latticed shell, braced vault
Single-layer or double-layer latticed shell structure with cylindric surface appearance
2.1.10 Hyperbolic paraboloid latticed shell
Single-layer or double-layer latticed shell structure with the appearance of hyperbolic paraboloid
2.1.11 Elliptic paraboloid latticed shell
Single-layer or double-layer latticed shell structure with the appearance of elliptic paraboloid
2.1.12 Lamella grid
Rhombic grid cell formed of two-way heterotropic member bars
2.1.13 Ribbed type
Trapezia grid cell formed of radial and circumferential member bar on spherical face
2.1.14 Ribbed type with diagonal bars (Schwedler dome)
Triangular grid cell formed of radial, circumferential and diagonal member on spherical face
2.1.15 Three-way grid
Equilateral triangle grid cell formed of three-way member bars
2.1.16 Fan shape three-way grid (Kiewitt dome)
Triangular grid cell formed of circumferential member bar jointly with the lamella grid formed of parallel rods in n (n=6, 8) sector curved surfaces divided radially on a spherical face
2.1.17 Sunflower shape three-way grid
Triangular grid cell formed of circumferential member bars jointly with the lamella grid formed of two-way radiated heterotropic member bars on a spherical face
2.1.18 Geodesic type
Three-way grid cells that form the grids on the base of the equilateral spherical triangle corresponding to the regular 20-polyhedron inscribed to the sphere
2.1.19 Composite latticed shell
Latticed shell structure formed by reinforced concrete slab as upper chord member and steel web member and bottom chord bar
2.1.20 Spatial truss
Lattice truss with triangular or tetragonal sectional area formed of upper chord, web member and bottom chord bar
2.1.21 Welded hollow spherical joint
Connecting joint with a hollow sphere welded of two hot stamping steel hemispheres (ribbed or not ribbed) by welding
2.1.22 Bolted spherical joint
Mechanically assembled joints formed of spare parts including bolted sphere, high-strength bolt, pin (or screw), sleeve, cone-head or closing plate
2.1.23 Embedded hub joint
Mechanically assembled joints formed of spare parts including column hub body, bar end embedment, upper and lower cover plates, centre bolt, flat washer and spring washer
2.1.24 Cast steel joint
Spatial joint made by casting technique, used for complicated shape or load-carrying condition
2.1.25 Pin axis joint
Mechanically assembled joints with unidirectional rotation function, formed of pin axis and pin plate
Contents
1 General Provisions
2.1 Terms
2.2 Symbols
3 Basic Requirements
3.1 Structure Types
3.2 General Design Requirements for Space Trusses
3.3 General Design Requirements for Latticed Shells
3.4 General Design Requirements for Spatial Trusses, Arches and Beam String Structures
3.5 Allowable Value of Structural Deflection
4 Structural Analysis
4.1 General Principles of Analysis
4.2 Static Analysis
4.3 Stability Analysis of Latticed Shells
4.4 Analysis on Internal Force Under Earthquake Action
5 Design and Details of Members and Joints
5.1 Members
5.2 Welded Hollow Spherical Joints
5.3 Bolted Spherical Joints
5.4 Embeded Hub Joints
5.5 Cast Steel Joints
5.6 Pin Joints
5.7 Joints of Composite Structures
5.8 Joints of Prestressed Cable
5.9 Supporting Joints
6 Fabrication, Erection and Acceptance
6.1 General Requirements
6.2 Requirements for Fabrication and Assembly
6.3 Assembly Elements in the Air
6.4 Erection by Strips or Blocks
6.5 Assembly by Sliding
6.6 Integral Hoisting by Derrick Masts or Cranes
6.7 Integral Lifting-up
6.8 Integral Jacking-up
6.9 Fold and Unfold Methods
6.10 Construction of Composite Space Trusses
6.11 Checking and Acceptance
Appendix A Types of Space Truss Commonly Used
Appendix B Types of Space Truss Commonly Used
Appendix C Equivalent Stiffness of Latticed Shells
Appendix D Simplified Method of Analysis for Composite Space Trusses
Appendix E Formula of Stability Capacity for Latticed Shells
Appendix F Formula of Multidimensional Response Spectrum
Appendix G Simplified Calculation of the Effect due to Vertical Earthquake for Roof Trusses
Appendix H Coefficient of Forces of Latticed Shells under Horizontal Earthquake
Appendix J Formula of Primary Dimensions of Embedded Hub Joints
Appendix K Material Behavior and Details Requirements of Elastomeric Bearing Pad
Explanation of Wording in This Specification
List of Quoted Standards
