Page 274 - Bridge and Highway Structure Rehabilitation and Repair

CHAPTER 6 APPLICATIONS OF BRIDGE DESIGN AND RATING METHODS 249

Table 6.4 HS-15 truck loads (introduced 1944)
(continued).
Lane Load Lane Load 0.48 Max. Moment
Span 0.48 Kips/ft 4 Kips/ft 4 HS-15 Truck Max. Shear/Reaction
Length Conc. Load of Conc. Load of 13.5 (L-1.55) (L-14)/L* HS-15 Truck
(Feet) 18 Kips (BM) 26 Kips (SF) (Kip-Ft) 18 (3L-28)/L* (Kips)
Long spans

130 1452.75 50.7
140 1648.5 53.1

150 1856.25 55.5
160 2076 57.9
170 2307.75 60.3

180 2551.5 62.7

190 2807.25 65.1
200 3075 67.5

Table 6.5 Maximum live load moments and shear forces for H-20 truck
(alternate lane loads apply).

Comparative Study of AASHTO and Simplified Formula
H-20 Truck Moments H-20 Truck Shear
Span AASHTO AASHTO
2
Length LL Moment Mmax 10(L-2.8) /L Reaction/Shear
(Feet) (Kip-Ft) (Kip-Ft) Force (Kips)
Small spans
20 160 147.92 34.4

30 246.6 246.61 36.3
40 346.0 345.96 36.8
Medium spans
50 445.6 445.57 58.5

60 558.0 545.31 60.8
70 707.0 645.12 62.4
80 872.0 744.98 63.6
90 1053.0 844.87 64.5

100 1250.0 944.78 65.3
110 1463.0 1044.72 65.9
* Developed by the author (lane load may govern).