Truck Definition

Table tbTruckDef

PURPOSE

The truck definition table defines both trucks and/or lane loading with moment and shear riders. Trucks can have a arbitrary number of axles using multiple lines of entry to define a single truck.

Parameters

tbTruckDef

Field	Type	Units	Description
TruckName	text		Truck Name
Description	text		Description of Truck
P1	real	KIP	Axle load
D1	real	FET	Spacing to next axle
P2	real	KIP	Axle load
D2	real	FET	Spacing to next axle
P3	real	KIP	Axle load
D3	real	FET	Spacing to next axle
P4	real	KIP	Axle load
D4	real	FET	Spacing to next axle
Unif	real	KLF	Altemate lane loading uniform load
Mom	real	KIP	Altemate lane loading moment rider
Shear	real	KIP	Altemate lane loading shear rider
LLImpact	chr		[Y|N] LRFR - Include live load impact (default if blank is YES)
TruckTrain	chr		[Y|N] LRFR - Truck train

Truck Name

Unique truck name. Use same name here as on the Live Load Definition entry to include stationary forces.

The Px and Dx parameters defines the truck axle loads and location. If more than four axles are required, continue entering more axle loads on the next line. You need only repeat the truck number on subsequent lines since the program only reads the uniform loading, lane loading, and title from the first line for any truck definition.

P1

Enter axle Load (not required) (Kip)

D1

Enter spacing to next axle (not required) (Feet)

P2

Enter axle Load (not required) (Kip)

D2

Enter spacing to next axle (not required) (Feet)

P3

Enter axle Load (not required) (Kip)

The Unif, Mom, and Shear entries are only needed on the first line of a truck definition and are used to specify the alternate lane loading forces. Enter values in the uniform, moment, and shear fields if an alternate lane loading is to be compared with the axle/truck loading. The load resulting in the greatest forces on the bridge will be used. If you want to keep these results separate from the axle loading condition, then create two trucks, one with only axle loads, and another with only lane loads. Combine the two using the Truck Group and Lane Group entries.

Unif

Enter alternate lane loading uniform load (not required) (KLF)

Mom

Enter alternate lane loading moment rider (not required) (Kip)

Shear

Enter alternate lane loading shear rider (not required) (Kip)

LLImpact

For LRFR choose if include impact factor. The default is Yes if left blank.

TruckTrain

For LRFR set this to Yes if this truck is to be duplicated in the live load calculation as a “Truck Train”.