GB/T 39681-2020 English PDF (GBT39681-2020)

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GB/T 39681-2020: Racking design code for steel static storage systems
GB/T 39681-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 53.080
J 83
Racking Design Code for Steel Static Storage Systems
ISSUED ON: DECEMBER 14, 2020
IMPLEMENTED ON: JULY 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Materials ... 5 
5 Loads and Load Combinations ... 6 
6 Rack Design ... 9 
7 Test Acquisition and Processing Methods of Some Parameters ... 23 
8 Overall Test of Combined Racking Unit ... 40 
Appendix A (informative) Equivalent Calculation Length Coefficient K of Racks
without Vertical Pull Rods ... 42 
Appendix B (informative) Requirements for Width-to-thickness Ratio of Uniformly
Pressed Plates ... 44 
Racking Design Code for Steel Static Storage Systems
1 Scope
This Standard specifies the terms, materials, loads and load combinations, racking design and
test methods for steel static storage systems.
This Standard is applicable to steel static storage systems made of cold-formed steel or hot-
rolled steel components, and mainly subjected to static loads.
2 Normative References
The following documents are indispensable to the application of this document. In terms of
references with a specified date, only versions with a specified date are applicable to this
document. In terms of references without a specified date, the latest version (including all the
modifications) is applicable to this document.
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature
GB/T 232 Metallic Materials - Bend Test
GB/T 700 Carbon Structural Steels
GB/T 1591 High Strength Low Ally Structural Steels
GB/T 2518 Continuously Hot-dip Zinc and Zinc Alloy Coated Steel Sheet and Strip
GB 4053.3 Safety Requirements for Fixed Steel Ladders and Platforms - Part 3: Industrial
Guardrails and Steel Platform
GB/T 18354 Logistics Terminology
GB/T 28576-2012 Calculation of Industrial Rack Design
GB 50009 Load Code for the Design of Building Structures
GB 50011 Code for Seismic Design of Buildings
GB 50018-2002 Technical Code of Cold-formed Thin-wall Steel Structures
JB/T 9018 Automated Storage and Retrieval System - Design Rules
JB/T 11270 Assembled Steel Rack Structure for High-bay Warehouse - Technical Requirements
comply with the requirements of 4.1.1 and 4.1.2.
4.2 Connectors
The strength design value of the connectors, such as: welds and bolts, shall comply with the
stipulations of GB 50018. For the bolts, Grade-8.8 or higher should be adopted.
5 Loads and Load Combinations
5.1 Classification
The loads on the rack structure can be divided into dead load, live load, vertical impact load,
horizontal load and possible wind load, snow load, roof live load and seismic action, etc. If
there are other types of loads, they shall comply with the stipulations of GB 50009.
5.2 Dead Load PDL
Dead load refers to the self-weight of the racking system. The dead load of the rack-clad
building shall also include the self-weight of the structures, such as: the roof and wall. The dead
load is composed of the weight of all permanent structures, including the racks and auxiliary
facilities connected to the racks, such as: fire sprinklers, heating ventilation and air conditioning
systems, etc., as well as other fixed auxiliary equipment that needs to be supported by the rack
members, and their masses shall all be included in the dead load.
5.3 Live Load PPL
Live load generally refers to the weight of the goods and carriers placed on the rack structure.
In addition, the floor slab and aisle loads in 5.7 shall also be included.
5.4 Vertical Impact Load PIL
5.4.1 The vertical impact load refers to the additional impact force generated on the beam when
the goods are stored, and usually, only loaded once at the most unfavorable position. When
designing beams, (if designed) brackets and hanging pieces, the load can be calculated in
accordance with the following situations:
a) When placing goods through mechanical equipment (automation), it shall be equal to
50% of the maximum unit load;
b) When manually placing goods (non-automation), it shall be equal to the maximum
unit load.
5.4.2 The vertical impact load is used to inspect local components (beams, hanging pieces and
brackets, etc.). When designing the overall structure of the racks, the influence of the vertical
impact load is not considered.
5.5 Horizontal Load PHL
5.5.1 The horizontal load acting on the combined rack structure refers to the horizontal force
generated by the defects caused by the initial bending of the rack structure members, the
installation deviation and load eccentricity, etc., as well as the normal operation of the handling
equipment.
5.5.2 The horizontal load generated by the defects described in 5.5.1 respectively acts on the
connection node of the beam and the column along the longitudinal and transverse main
directions of the combined rack structure. The horizontal load may be taken as 0.4% of the sum
of the total dead load and the maximum live load transmitted from the beam to the node.
5.5.3 For racks with handling equipment, the horizontal load shall be determined in accordance
with the relevant information provided by the manufacturer of the handling equipment.
5.6 Seismic Action PEL
5.6.1 The seismic action and structural seismic checking calculation shall comply with the
relevant stipulations of GB 50011.
5.6.2 For rack structures with a height of not more than 40 m, mainly shear deformation, and
relatively uniform distribution of mass and stiffness along the height, simplified methods, for
example, the bottom shear force method can be adopted. For the rack structures other than this
type, the mode decomposition response spectrum method should be adopted.
5.6.3 For the seismic checking calculation of the cross-section of the members, the design value
of the seismic bearing capacity shall take R/0.75; the design value of the bearing capacity
stability shall take R/0.8; R is the design value of the bearing capacity of the structural member.
5.7 Floor Slab and Aisle Loads
For the load acting on the floor slab or aisle, in accordance with the actual demands, calculate
the uniformly distributed load or concentrated load, which shall not be lower than 300 kg/m2.
The other situations shall comply with the relevant stipulations of GB 4053.3.
5.8 Thrust on the Railing
The railings of stairs and floor slabs shall be designed to be able to withstand a thrust of no
more than 0.7 kN/m acting in any direction above the railings. The other situations shall comply
with the relevant stipulations of GB 4053.3.
5.9 Wind Load PWL
The wind load checking calculation of the rack-clad building shall comply with the relevant
stipulations of GB 50009.
5.10 Snow Load PSL and Roof Live Load PRL
The snow load and roof live load checking calculation of the rack-clad building shall comply
with the relevant stipulations of GB 50009.
0.9;
cW---the combined value coefficient of wind load, which shall take 0.6;
cR---the combined value coefficient of snow load and roof live load, which shall take
0.7.
When designing the racks in accordance with the limit states of normal application, the partial
factors for the various loads may refer to the combination of Formula (1) ~ Formula (6), and all
the nume...