This standard specifies the terms and definitions, marks and specifications, requirements, test methods, inspection rules, acceptance, and marking, packing, transportation and storage of the welded hollow spherical node of space grid structures.
This standard is applicable to the quality control of the part and component products of the welded hollow spherical node space grid of such space grid structures as space grid, single-layer latticed shell and double-layer latticed shell.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to these specifications.
GB/T 222 "Method of Sampling Steel for Determination of Chemical Composition and Permissible Variations for Product Analysis"
GB/T 223 "Methods for Chemical Analysis of Iron, Steel and Alloy"
GB/T 228 "Metallic Materials-Tensile Testing at Ambient Temperature"
GB/T 2975 "Steel and Steel Products--Location and Preparation of Test Pieces for Mechanical Testing"
GB/T 5117 "Carbon Steel Covered Electrodes"
GB/T 5118 "Low Alloy Steel Covered Electrodes"
GB/T 8110 "Welding Electrodes and Rods for Gas Shielding Arc Welding of Carbon and Low Alloy Steel"
GB/T 10045 "Carbon Steel Flux Cored Electrodes for Arc Welding"
GB/T 14957 "Steel Wires for Melt Welding"
GB/T 17493 "Low Alloy Steel Flux Cored Electrodes for Arc Welding"
GB/T 19879 "Steel Plates for Building Structure"
GB 50205-2001 "Code for Acceptance of Constructional Quality of Concrete Structures"
HG/T 2537 "Carbon Dioxide for Welding Use"
JG/T 203 "Method for Ultrasonic Testing and Classification for Steel Structures"
JGJ 61-2003 "Technical Specification for Latticed Shells"
JGJ 81 "Technical Specification for Welding of Steel Structure of Building"
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
Welded hollow spherical node
The node connecting the member bar and the welded hollow sphere, as shown in Figure 1.
3.2
Welded hollow sphere
The sphere welded with two hot-stamped steel hemispheres with or without rib, as shown in Figure 2 and Figure 3 respectively.
3.3
Rib plate strengthened welded hollow sphere
The circular steel plate set at the circular splicing weld on the inner wall of two hemispheres and welded with the sphere into one entirety.
