The traffic projection for a new pavement of a two-lane rural dual carriageway is as follows: Design period = 25 years AADT in current year = 5000 vehicles per day Direction factor = 0.5 Percent of heavy vehicles = 6% Annual traffic growth = 6% Damage index: ESA/HVAG = 0.75; SAR5/HVAG = 0.95; SAR7/HVAG = 1.65; SAR12/HVAG = 19.65. %3D %3D Table 2 Traffic load distribution Load (kN) SAST SADT TAST TADT TRDT 70 0.21 0.12 0.31 0.18 0.21 80 0.34 0.29 0.21 0.48 0.41 0.38 0.136 0.294 0.315 0.103 0.152 90 0.45 0.59 0.48 0.34 Proportion of each axle group a) Calculate the average number of axle groups per heavy vehicle NHvAG Using the data in the Table. b) Calculate the design traffic in HVAG (NDT). c) Calculate the design traffic in ESA, SAR5, SAR7 and SAR12.
The traffic projection for a new pavement of a two-lane rural dual carriageway is as follows: Design period = 25 years AADT in current year = 5000 vehicles per day Direction factor = 0.5 Percent of heavy vehicles = 6% Annual traffic growth = 6% Damage index: ESA/HVAG = 0.75; SAR5/HVAG = 0.95; SAR7/HVAG = 1.65; SAR12/HVAG = 19.65. %3D %3D Table 2 Traffic load distribution Load (kN) SAST SADT TAST TADT TRDT 70 0.21 0.12 0.31 0.18 0.21 80 0.34 0.29 0.21 0.48 0.41 0.38 0.136 0.294 0.315 0.103 0.152 90 0.45 0.59 0.48 0.34 Proportion of each axle group a) Calculate the average number of axle groups per heavy vehicle NHvAG Using the data in the Table. b) Calculate the design traffic in HVAG (NDT). c) Calculate the design traffic in ESA, SAR5, SAR7 and SAR12.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The traffic projection for a new pavement of a two-lane rural dual carriageway is
as follows:
Design period = 25 years
AADT in current year = 5000 vehicles per day
Direction factor = 0.5
Percent of heavy vehicles = 6%
Annual traffic growth = 6%
Damage index: ESA/HVAG = 0.75; SAR5/HVAG = 0.95; SAR7/HVAG = 1.65;
SAR12/HVAG = 19.65.
%3D
%3D
Table 2 Traffic load distribution
Load (kN)
SAST SADT TAST TADT TRDT
70
0.21
0.12
0.31
0.18
0.21
80
0.34
0.29
0.21
0.48
0.41
90
0.45
0.59
0.48
0.34
0.38
Proportion of each axle group
0.136 0.294 0.315 0.103 0.152
a) Calculate the average number of axle groups per heavy vehicle NHvaG Using the
data in the Table.
b) Calculate the design traffic in HVAG (NDT).
c) Calculate the design traffic in ESA, SAR5, SAR7 and SAR12.
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