City of Frisco Engineering Standards

Engineering Standards
Table 3.1 – Pavement Design Inputs
Thoroughfare Classification
Input
Type A Type B Type C Types D-G,
Alley, Fire
Lane
Design Period 20 years 20 years 20 years 20 years
Initial Serviceability 4.5 4.5 4.5 4.5
Terminal Serviceability 2.5 2.3 2.3 2.0
Concrete MOR @ 28 days 620 psi 620 psi 620 psi 620 psi
Concrete E @ 28 days 5,000,000 psi 5,000,000 psi 5,000,000 psi 5,000,000 psi
Modulus of Subgrade Reaction
(Eagle Ford Shale Formation)
300 psi/in 300 psi/in 300 psi/in 270 psi/in
Modulus of Sugrade Reaction
(Austin Chalk Formation)
420 psi/in 420 psi/in 420 psi/in 420 psi/in
Reliability 95% 92% 90% 85%
Standard Deviation 0.35 0.35 0.35 0.35
Load Transfer Coefficient 2.9 2.9 2.9 2.9
Drainage Coefficient 1.0 1.0 1.0 1.0
Design Average Daily Traffic
(ADT) 60,000 30,000 20,000 12,000
Traffic Growth Rate 3% 3% 3% 3%
Percent Trucks 3% 3% 2% 2%
Lanes 6 4 2 2
Lane Distribution Factor 0.7 1 1 1
I. Alley pavement thickness shall be 8”–5”–8” with pavement strength and reinforcement as shown
in the Standard Details.
J. Sidewalk thickness shall be as shown in Table 3.2.
Table 3.2 – Sidewalk Thickness
Sidewalk Width Thickness of
Reinforcing
Concrete
up to 6’ 4” #3 bars @ 18” o.c.e.w. or
fiberglass mesh
6’-1” to 7’-11” 5” #3 bars @ 18” o.c.e.w. or
fiberglass mesh
8’ or greater 6” #3 bars @ 18” o.c.e.w. or
fiberglass mesh
K. Fire lane paving shall be designed with the same design inputs as Types D-G streets.
Section 3 – Pavement and Subgrade Design Requirements May 2012 Page 3-9