Wind load for Russian snip code

Hi,

1. The Exposure factor (e) is the fraction of the influence area associated with the joint(s) on which the load may act if it is also exposed to the wind load. Wind Exposures are a way to account for surfaces,for example, perforated mesh, that are less than 100% solid with regard to the way they collect wind. These kinds of surfaces can be accounted for by entering an Exposure factor between 0 and 1.0 to represent the fraction of the surface that is solid and collects wind load. A value of 1.0 means that the wind force may be applied on the full influence area associated with the joint(s) if they are also exposed to the wind load direction.
Exposure factor calculation approach is same for all wind load codes, total load on a particular joint is calculated as follows:

Joint load = (Exposure Factor) × (Influence Area) × (Wind Intensity)

Note any joint does not have an exposure assigned, the exposure will be taken as 1.0.

2. You have selected Configuration 12 for lattice steel structures correctly.

3. Factor is used in conjunction with the Exposed Surface and Direction, this values influences which surface of a structure receives
wind load. (This value can also act as a linear multiplier on the applied loads.) If you click and hold you mouse left button on "Loading Convention" button below Factor, the dialogue that shows how factor sign affects load application will appear.

Thank you for your kindness

Regarding No.2, I am still confused.

I simply assumed one cantilever type of column and perform the analysis for the different section size.

(Type 1 assumed : H700x300x13x21,

Type 2 assumed : H150x75x7.5x11)

If it is open structure, its width is different about 3 times, so the result shall be hug different.

But actually results were same.

For easy understanding, I attached my sample code.

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 25-May-16
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
2 0 0 7; 12 0 5 7; 13 0 2 7; 14 0 3 7;
MEMBER INCIDENCES
8 2 13; 9 13 14; 10 14 12;
START USER TABLE
TABLE 1
UNIT METER KN
WIDE FLANGE
500X400
0.0585 0.5 0.025 0.6 0.04 0.00269995 0.00144055 2.77875e-05 0.0125 0.032
END
DEFINE MATERIAL START
ISOTROPIC B30
E 3.24711e+07
POISSON 0.2
DENSITY 24.525
ALPHA 1e-05
DAMP 0.05
G 9.28139e+06
ISOTROPIC STEELGOST
E 2.06e+08
POISSON 0.3
DENSITY 77.0085
ALPHA 1.2e-05
DAMP 0.03
G 7.8e+07
ISOTROPIC STEEL
E 1.99947e+08
POISSON 0.3
DENSITY 76.8191
ALPHA 6.5e-06
DAMP 0.03
G 7.7221e+07
TYPE STEEL
STRENGTH RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY JAPANESE
8 TO 10 TABLE ST H700x300x13x24
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
2 FIXED
CUT OFF MODE SHAPE 60
DEFINE WIND LOAD
TYPE 1 WIND 1
<! STAAD PRO GENERATED DATA DO NOT MODIFY !!!
SNIP-2016:PARAMS
!> END GENERATED DATA BLOCK
SP20 2016 PRESSURE 100 TERRAIN C REG 7 LOG 0.3
EXP 1 JOINT 2 12 13
DEFINE REFERENCE LOADS
LOAD R1 LOADTYPE Mass  TITLE MASS
JOINT LOAD
12 FX 470 FZ 470
END DEFINE REFERENCE LOADS
LOAD 1 LOADTYPE Wind  TITLE WIND X+
WIND LOAD X 1 CONFIG 12 NU 1 TYPE 1 XR -0.5 0.5 YR 0 36 ZR 0 14
PERFORM ANALYSIS PRINT STATICS CHECK
FINISH