Load Train > Input Pad

Definition of new load trains or modification of existing load trains.

Setting	Description
Number	The identification number of the traffic loading.
Fact-min	The factor to be applied to the 'Minimum evaluations' (negative extreme values). Default: 1.0 Note: The factors Fact-min and Fact-max allow for differing between the effect onpositive result values (e.g. mid-span moments) and negative result values (e.g. hogging moments).
Fact-max	The factor to be applied to the 'Maximum evaluations' (positive extreme values). Default: 1.0
Description	Descriptive text for the load train (max. 80 characters)
OPTION Load function	If the option is selected, Variables (expressions or tables) are defined and assigned, describing the uniform load intensity as a function of the effective loaded length (q=f(qlen)), and/or the results as functions of a Beta-value. Note: Using load intensities dependent on the loaded length and a lane factor is requested in the British Standard and derived codes. The required definitions can also be generated in the menu Extras with using the appropriate traffic load macro.
Load function f(qlen)	Formula (defined in variable menu) defining the intensity of the uniform load as function of the loaded length (see Sec. 6.2, Table 13 of BD37/01) ; used for Russian Bridge Code – SP.35.13330.2011, for defining the railway cK load (previously variable needs to be defined in Properties/Variables as a formula which is a function of qlambda - λ and qalpha – α ; lambda and alpha are automatically calculated by program).
Beta function	Formula (defined in variable menu) defining the lane factor Beta as a function of the loaded length and the lane width (see Sec. 6.4, Table 14 of BD37/01) ; For Russian Bridge Code we use this entry for user input of coefficient K, related to the class of bridge – this coefficient K will be multiplied with entered formula in qlen variable.
OPTION Piece-wise linear approximation	Obsolete. The load function q=f(qlen) and the Beta function are piece-wise linearized (sections with 10 cm length up to qlen=400 m). The option was used in previous versions for reducing the calculation time. New optimization techniques made it obsolete.
OPTION Lb=Min(L, 2*A/Ymax)	In case of cusped sections of the influence line (Fig. 11, BD37/01) an equivalent triangular function with the fictitious load length Lb is evaluated if Lb < L. Ymax indicates the peak value of the influence line and A the area under the influence line along the section L between two zero points (see user manual chapter 10.6.5.4).
OPTION Load only Lb length	Only the triangular function with load length Lb is evaluated.
OPTION SNIP q = f (lambda,alpha,K)	This option must be checked if we want to consider Russian Railway Load.