D13.B.4 Design Parameters
Information on parameters, data used for check and selection of sections in design of steel structures according to Russian Code is presented in the following table.
In this version of calculation according to requirements of SNiP 2.01.07. 81* there is common database of equal legs angles and unequal legs angles, therefore solution of section selection problem may give equal legs angle as well as unequal legs angle irrespective of set at the beginning. The same is and with rectangular and square tubes.
Values of parameters do not depend on command UNIT. Only these values of parameters, which differ from, defined in the program need to be included in the input data file.
Review of sections (command CHECK) can be performed according to the first and the second group of limit states. Selection of section (command SELECT) can be performed only according to the first group of limit states with subsequent recalculation and verification of selected section with allowance for deflection.
Calculation for the first group of limit states involves selection of members according to strength and stability. Parameters CMN and CMM give opportunity to set slenderness limit for compression and tension members respectively for their stability calculation, or refuse consideration of slenderness by setting default parameters. In this case selection of sections will be performed with consideration only of strength check.
Check for deflection performed by setting parameter DFF (maximum allowable relative deflection value) different from set in the program.
In the case of application of steel not defined by SNiP and/or GOST it is necessary to set their design strength by parameters UNL and PY.
In determination of steel parameters SBLT and MAIN shall be approved (see Table 15B.4).
Parameter Name  Default Value  Description 

CODE   
Must be specified as RUSSIAN 1990 Design code to follow. See TR.48.1 Parameter Specifications. 
BEAM  1 
Member design parameter:

CB  1 
Place of loading on beam:

СMM  0 
Slenderness limit value for tension members:
Set slenderness limit value not equal to "0" for design with evaluation of buckling effect 
CMN  0 
Slenderness limit value for compression members:
Set slenderness limit value not equal to "0" for design with evaluation of buckling effect 
DFF  0. 
Allowable limit of relative local deflection (Member length/Deflection Ratio): Default value 0 is valid if design is applied without deflection limitation. Set for deflection check only 
DMAX [m] 
1.  Maximum allowable section depth 
DMIN [m] 
0.  Minimum allowable section depth 
GAMC1  1.0  Specific service condition coefficient for buckling design 
GAMC2  1.0  Specific service condition coefficient for strength design 
GMF  1.0  Ratio between design and characteristic load value 
KY  1.0  Coefficient of effective length in respect to local axis Y (in plane XZ) 
KZ  1.0  Coefficient of effective length in respect to local axis Z (in plane XY) 
LEG  4 
Type and position of loading on beam:

LY [m] 
Member length 
Effective length in respect to local axis Y (in plane XZ) Default is selected member's length 
LZ [m] 
Member length 
Effective length in respect to local axis Z (in plane XY) Default is selected member's length 
MAIN  1 
Standard of steel grade (GOST):

NSF  1.0  Net section factor for tension members or web section area weakening factor for bending members 
PY [MPa] 
0 
Design steel strength (yield strength): If parameters MAIN according to Standard of steel grade (GOST) and by SGR according to Steel grade (STAL) are not defined 
RATIO  1.0  Permissible ratio of the actual capacities. 
SBLT  0 
Number of lateral bracing restraints along the span:

SGR  1 
Steel grade (STAL). Refer to Table 12B.4 below. 
TB  0 
Indication of elastic or elasticplastic calculation:
Set for members under bending or nonaxial compression/tension only. 
TRACK  0 
Output parameter:

UNL [MPa] 
0 
Design steel strength (ultimate strength): If parameters MAIN according to Standard of steel grade (GOST) and by SGR according to Steel grade (STAL) are not defined 
SGR Value  Steel  Parameter MAIN  GOST  For members* 

1  C235  1  GOST 2777288  GT, F 
2  C245  1   GT, F 
3  C255  1   GT, F 
4  C275  1   GT, F 
5  C285  1   GT, F 
6  C345  1   GT, F 
7  C345K  1   GT, F 
8  C375  1   GT, F 
9  C390  1   F 
10  C390K  1   F 
11  C440  1   F 
12  C590  1   F 
13  C590К  1   F 
14  BSt3kp  2  GOST 1070580*  Tube 
15  BSt3ps 
2 3 
GOST 1070580* GOST 1070676* 
Tube 
16  BSt3sp 
2 3 
GOST 1070580* GOST 1070676* 
Tube 
17  20  4  GOST 873187  Tube 
18  16G2АF  5  TY 14356776  Tube 