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 準拠する設計コード。「TR.48.1 パラメータの設定」を参照してください。 |
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 elastic-plastic calculation:
Set for members under bending or non-axial 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 27772-88 | 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 10705-80* | Tube |
15 | BSt3ps |
2 3 |
GOST 10705-80* GOST 10706-76* |
Tube |
16 | BSt3sp |
2 3 |
GOST 10705-80* GOST 10706-76* |
Tube |
17 | 20 | 4 | GOST 8731-87 | Tube |
18 | 16G2АF | 5 | TY 14-3-567-76 | Tube |