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GB 50959-2013: Load code of nonferrous metals engineering structures
GB 50959-2013
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50959-2013
Load code of nonferrous metals engineering structures
ISSUED ON. DECEMBER 19, 2013
IMPLEMENTED ON. JULY 01, 2014
Issued by. Ministry of Housing and Urban-rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
Foreword... 6 
1 General provisions... 8 
2 Terms and symbols... 8 
2.1 Terms... 8 
2.2 Symbols... 12 
3 Classification of loads and representative values of loads... 13 
3.1 Classification of loads... 13 
3.2 Representative values of loads... 13 
4 Combination of loads... 14 
4.1 General requirement... 14 
4.2 Combination values of load effect... 15 
4.3 Load coefficients... 19 
4.4 Reduction of variable loads... 20 
5 Permanent load... 21 
6 Variable load... 22 
6.1 Variable load on floor and ground... 22 
6.2 Dynamic machine load... 23 
6.3 Crane load... 24 
6.4 Foundation load of industrial furnace... 26 
6.5 Load of pipeline and equipment... 27 
6.6 Load of storage material... 27 
6.7 Other loads... 28 
7 Indirect action... 29 
7.1 Thermal action... 29 
7.2 Other actions... 30 
8 Accidental loads... 31 
8.1 General requirement... 31 
8.2 Explosion load... 31 
8.3 Other loads... 32 
9 Loading condition... 33 
9.1 General requirement... 33 
9.2 Content of load condition... 33 
9.3 Assessment of load condition... 38 
9.4 Other regulations... 38 
Appendix A Variable load on floor and ground f mine engineering... 40 
Appendix B Variable load on floor and ground of metallurgical engineering... 43 
Appendix C Variable load on floor and ground of metal processing engineering... 57 
Appendix D Physical parameters of materials commonly used for engineering... 63 
Appendix E Dynamic effect coefficient of machines commonly used for engineering
... 65 
Appendix F Simplified calculation of natural vibration frequency of reinforced concrete
ribbed floor... 67 
Explanation of wording in this Code... 71 
References... 72 
Load code of nonferrous metals engineering structures
1 General provisions
1.0.1 This Code is formulated, in order to meet the needs of non-ferrous metal
engineering construction, AND meet the requirements of industrial buildings and
structures, that are safe, applicable, economically reasonable.
1.0.2 This Code is applicable to the structural design of the main works and auxiliary
facilities, for new construction and expansion of non-ferrous metal mining, smelting,
processing projects.
1.0.3 The actions, which are involved in the design of non-ferrous metal engineering
structures, shall include direct actions (i.e., loads) and indirect actions (including
temperature, deformation, etc.). This Code mainly stipulates the direct effect; the
relevant provisions also apply to the indirect effect.
1.0.4 All kinds of loads and actions, which are used in non-ferrous metal engineering
structures, shall not only comply with this Code, but also comply with the current
relevant national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Action
It is divided into direct action and indirect action. The concentrated or distributed force,
which is exerted on the structure, is a direct action, that is, a load; the cause of the
external deformation or restrained deformation of the structure is an indirect action.
2.1.2 Permanent load
A load, whose value does not change with time, OR whose change is negligible as
compared to the average value, OR whose change is monotonic and can approach the
limit value, during the service life of the structure.
2.1.3 Variable load
A load, whose value varies with time AND whose variation is not negligible, as
compared to the mean, during the service life of the structure.
2.1.4 Accidental load
A load, which does not necessarily occur, during the service life of the structure;
however, once it occurs, its value is large AND has a short duration.
2.1.5 Equivalent uniform live load
A load, whose actual load that is discontinuously distributed is replaced by a uniform
load, so that the load effect obtained on the structure can be consistent with the actual
load effect.
2.1.6 Working load
Under normal production conditions, the load on the floors and grounds, which is
comprehensively generated by operators and their routine tools and appliances, the
quantitative materials, semi-finished products, finished products, small mobile
conveying devices necessary for production, as temporally stored in the production
process.
2.1.7 Overhauling load
Under abnormal production conditions, the load on the floor and ground, which is
generated comprehensively by the maintenance, overhaul, testing of production devices
such as machines and equipment, the large stacking of spare parts, materials, operating
equipment in a short period of time, as well as the large mobile transportation equipment
in the process of maintenance and testing.
2.1.8 Crane load
The load, in the vertical direction, horizontal lateral direction, horizontal longitudinal
direction, etc., on the plant structure, which is generated by the crane, when it lifts and
transports heavy objects.
2.1.9 Load of amassed ashes
The load, which is caused by the accumulation of ash and the ash-cleaning facilities, in
the area of roofs, skylights and their wind-shielding facilities, of the workshops and
warehouses where a large amount of soot and dust are generated, as well as their
adjacent buildings, under certain ash cleaning systems and facilities conditions.
2.1.10 Installation load
The temporary additional load, which acts on the structure and components, under the
construction and installation state of the engineering structure.
2.1.11 Autocars and locomotives load
For variable loads, the load value, that makes the exceeding probability of the combined
load effect, in the design reference period, tend to be consistent to the corresponding
probability of the load, which appears alone; OR the load, that makes the combined
structure have a uniformly specified reliability index.
2.1.22 Quasi-permanent value
For variable loads, the load the total time beyond which is about half the design
reference period, in the design reference period.
2.1.23 Frequent value
For variable loads, in the design reference period, the load the total time beyond which
is the specified smaller ratio OR the exceeding frequency is the load value of the
specified frequency.
2.1.24 Load effect
The reactions of structures or structural members, which are caused by loads, including
internal forces, deformations, cracks, etc.
2.1.25 Load combination
When designing according to the limit state, the provision on various design loads,
which occur at the same time, in order to ensure the reliability of the structure.
2.1.26 Fundamental combination
When calculating the limit state of bearing capacity, the combination of permanent load
and variable load.
2.1.27 Accidental combination
A combination of permanent loads, variable loads, and an accidental load, for the
calculation of the ultimate limit state. The combination of permanent load and variable
load, when the damaged structure is subject to overall stability check, after accidental
event occurs.
2.1.28 Nominal combination
In the calculation of the limit state of normal service, it adopts the nominal value or the
co...