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). |
Fact-max | The factor to be applied to the 'Maximum evaluations' (positive extreme values). |
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. |
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. |