Superseding
Chinese Name	ԤӦ��������·�湤�̼����淶
English Name
Chinese Standard Classification
Professional Classification
ICS Classification
Issued on	2007-03-26
Implemented on	2007-12-01
Abolished on
Issued by	MOC
Chinese Pages
Word Count	11,000 words

1  General Provisions
1.0.1  This code is formulated to meet the needs of transportation and communication development and ensure high-quality engineerings of prestressed concrete pavement in order for advanced technology, economy and rationality as well as safety and usability.
1.0.2 This code is applicable to the design, construction and acceptance of newly-built unbounded prestressed concrete pavement.
1.0.3  It shall apply new technology, new material, new process and to engineerings of prestressed concrete pavement so as to meet the requirements of application condition, environment condition and economic condition for engineering.
1.0.4  The engineering design, construction and acceptance of prestressed concrete pavement shall not only meet the requirements stipulated in this standard (code), but also comply with those in the current relevant ones of the nation.
2  Terms and Symbols
2.1  Terms
2.1.1  Cement concrete pavement
The pavement with cement concrete as surface course (reinforcement or non-reinforcement), which is also called rigid pavement.
2.1.2  Cement concrete pavement
The cement concrete pavement where compression stress is imposed on pavement working section in advance to improve mechanical performance.
2.1.3  Critical load position
The location with maximum fatigue damage caused by prestressed concrete pavement under combined action of load and temperature.
2.1.4  Sliding layer
The pavement structure layer set up on top surface of base layer to prevent loss of prestress caused by excessive slab bottom friction resistance of prestressed concrete pavement.
2.1.5  Unbounded prestressing tendon
Single prestressed steel strand applying special anti-corrosive lubricant grease and plastic coating; it may keep relative sliding between steel strand prestressed concrete.
2.1.6  Slab bottom friction stress
The stress on pavement slab caused by relative sliding between slab and base layer of prestressed concrete pavement.
2.2  Symbols
2.2.1  Material property
Et— Equivalent modulus of resilience for top surface of base layer;
Ec—Flexural-tensile elastic modulus of concrete;
Ez—Elastic modulus of reinforcement;
Eo—Equivalent modulus of resilience for top surface of road bed;
E1— Modulus of resilience of base layer;
E2— Modulus of resilience of base layer; subbase layer or under layer;
Ek— Equivalent modulus of resilience for base layer and subbase layer or under layer;
fr—Standard value for flexural-tensile strength of concrete;
fyk—Standard value for strength of ordinary reinforcement;
Dx — Equivalent flexural rigidity of base layer and subbase layer or under layer;
ρ—Concrete density.
2.2.2  Action, action effect and bearing capacity
σ1r—Load fatigue stress;
σ1.—Load stress;
σΔTr—Temperature fatigue stress;
σΔT—Temperature stress of pavement slab;
σp— Mean compression stress of concrete caused by effective prestress;
σF—Friction stress of subgrade;
σpc—Effective prestress of prestressing tendon;
σcon—Tension control stress of prestressing tendon;
σ1n—Value for prestress loss of nth item;
N.—Action times of standard axial loading;
Ni—Action times of Grade   axial loading of all axle types;
Nc—Accumulated action times of standard axial loading of lane in design life;
Pi—Total weight of all axle types
2.2.3  Geometric parameter
dn—Nominal diameter of steel strand
δ—Displacement value for ends of pavement slab;
Ls—Calculated length of sliding area;
r—Relative rigidity radius of prestressed concrete slab;
h—Thickness of concrete slab;
hx—Equivalent thickness of base layer and subbase layer or under layer;
h1—Thickness of base layer;
h2—Thickness of subbase layer or under layer;
χ—Distance between calculated load position and slab end.
2.2.4  Calculation coefficients and others
ai—Coefficient of axle -wheel type;
gr—Annual average growth rate of traffic volume;
t—Design life;
η—Coefficient of wheel tracking transverse distribution;
 —Friction coefficient of subgrade;
Tn—Maximum temperature difference of pavement slab;
 —Variation coefficient;
r—Reliability coefficient;
TR —Gradient calculated value for maximum temperature of concrete slab;
κ—Friction coefficient considering partial deviation of per meter hole;
 —Friction coefficient between prestressing tendon and hole wall;
β—Reinforcement ratio;