HL93 LRFD Bridge Design Loading

[CalPoly09]

AASHTO specs out a 0.64klf lane loading for a ten foot width and a single design truck to be applied in a simple span bridge. Does the number of design trucks that are applied to the span change depending on the span?

If it does what is the spacing between them?

References to AASHTO would be appreciated, or other published material

 

[bridgebuster]

Simple span is only one truck or tamdem, + lane load.

LRFD 3.6.1.2

 

[crossframe]

What he said. (But tandem.)

Note that this is in each lane, modified as appropriate with the Multiple Presence Factor, positioned to give the greatest live load effect.

(By the way, I was CalPoly '91)

 

[BridgeEI]

FYI, multiple spans use 90% of two design trucks 50' to produce the maximum negative moment over interior supports - 3.6.1.3

 

[cap4000]

It appears that the HL-93 loading has typical bending moments on the order of 2 to 3 times larger that the old AASHTO standard procedure. What is your span?