1.1.1 In order to carry out national technical and economic policies in the structural design for water supply and drainage structures, and to realize technical advancement, economic feasibility, safety and quality, this code is formulated.
1.0.2 This code is applicable to the structural design of general water supply and drainage structures for the municipal utilities and industrial enterprises, but is inapplicable to the structural design of special-purpose water supply and drainage structures for the industrial enterprises.
1.0.3 The structures and underground structures designed to store water or treat water generally adopt reinforced concrete structure; when the capacity is relatively smaller and the safety class is lower than second class, brick masonry structure can be adopted.
In the region where the mean monthly air temperature is less than -3℃ in the coldest month, the exposed water storage or water treatment structure can not be made under brick masonry.
1.0.4 This code is formulated on the base of national standards GB 50068-2001 Uniform Standard for the Design of Building Structure Reliability and GB50153-1992 Uniform Standard for the Design of Engineering Structure Reliability.
1.0.5 When designing according to this code, the determination of general load, element section calculation and foundation design shall be carried out according to the current national standards. The structural design of water supply and drainage structures built in earthquake area, collapsible loess area or dilative soil area shall be compliant to the provisions of relevant national standards.
2. Major symbols
2.0.1 Action and action effects
Feq,k,F’eq,k Normal value of lateral earth pressure above and under the groundwater level;
Fdw,k Normal value of running water pressure;
qfw,k Normal value of uplift force of groundwater;
FIk Normal value of ice pressure;
fI Ultimate compressive strength of ice;
fIm Ultimate flexural compressive strength of ice;
S Combined design value of action effect;
ωmax Maximum fracture width of reinforced concrete member;
ys Gravimetric density of backfill;
ys0 Gravimetric density of undisturbed soil;
