Applied Loads and Stability of Steel and Steel-Concrete Composite Bridges - Finite Element Analysis and Design of Steel and Steel-Concrete Composite Bridges - page 126

145,000 N 145,000 N 145,000 N

4300 mm 4300 - 9000 mm

1800 mm

600 mm General
300 mm Deck overhang

Design lane 3600 mm

Figure 3.9 Characteristics of the design truck specified in AASHTO [1.23].

of deck overhangs with a cantilever, not exceeding 1800 mm from the cen-
terline of the exterior girder to the face of a structurally concrete railing, the
outside row of wheel loads may be replaced with a uniformly distributed line
load of 14.6 N/mm intensity, located 300 mm from the face of the railing.
To allow for dynamic effects, as specified in AASHTO, the static effects of
the design truck or tandem, other than centrifugal and braking forces, shall
be increased by the percentage specified in Table 3.3 . For the dynamic load

Table 3.3 Dynamic Load Allowance (IM) Recommended by AASHTO [1.23]
Component IM (%)

Deck joints—all limit states 75

All other components
Fatigue and fracture limit state 15

All other limit states 33