Use the Vehicle Data - Horizontal Loading form to specify the horizontal centrifugal and braking/acceleration loads associated with a defined vehicle.
Centrifugal Load
Consider Centrifugal Load check box. Check the box to define centrifugal loading for the vehicle.
Scale options and Velocity or Length edit box.
Scale Velocity^2/g option. Select this option to calculate the centrifugal load by the square of velocity divided by acceleration of gravity, g. In this case, velocity in the current units is required to be input in the Velocity edit box.
Scale by Unit Length option. Select this option to calculate the centrifugal load by the length factor. In this case, length in the current units is required to be input in the Length edit box.
Axle Load Factor edit box. Enter an axle load factor to calculate the centrifugal load as the scale factor multiplied by the vertical axle loads.
Uniform Load Factor edit box. Enter a uniform load factor to calculate the centrifugal load as the scale factor multiplied by the vertical uniform loads.
Consider Overturning check box. When this box is checked, the overturning effects due to non-zero height of the center of gravity specified in the Vehicle Data form will be considered in the moving analysis. Overturning effects will only be included if both the vehicle and the lane have width. The overturning moment is represented as a moment-couple of vertical loads, and will be limited so as not to cause uplift on the uphill side of the vehicle.
Braking/Acceleration Load
Consider Braking Load check box. Check the box to define braking/acceleration for the vehicle.
Factor Set 1 for Axle Loads and Uniform Loads edit boxes. Enter scale factors which will multiply the corresponding vertical axle and/or uniform loads to generate the braking/acceleration loads.
Factor Set 2 check box and Axle Loads and Uniform Loads edit boxes. When code requirements require the envelope of two sets of braking factors, check this box and enter the second set of scale factors for the axle and uniform vertical loads.
Skew Factor check box and Axle Loads and Uniform Loads edit boxes. When the box is checked, the factors input for axle and uniform loads multiply the longitudinal braking/acceleration force to generate transverse skew braking/skidding forces.
To display the Vehicle Data-Horizontal Loading form:
From the Vehicle Data form, click the Horizontal Loading... button to access this form.
See Also