INTERSTATE STANDARD
DOUBLE STEEL HOT ROLLED
SORTS
GOST 8239-89
Moscow
INTERNATIONAL STANDARD
Valid from 01.07.90
Failure to comply with the standard is punishable by law
This standard specifies the range of hot rolled steel I-beams with a slope of the inner edges of the flanges.
1. The cross-section of the I-beams must correspond to that indicated in the drawing. 1.
h - I-beam height; b - shelf width; s - wall thickness; t - average shelf thickness; R - radius of the inner rounding; r - flange radius
Damn. 1
Note. The slope of the inner edges of the shelves should be 6-12%.
Table 1
Notes:
1. The cross-sectional area and mass of 1 m of the I-beam are cleaned according to nominal dimensions; the density of the steel is assumed to be 7.85 g /cm 3 .
2. The values of the radii of rounding, the slope of the inner edges of the shelves, the thickness of the shelves, indicated in fig. 1 and in table. 1, are given for building calibers and are not monitored on finished hire.
3. The tables use the following notation:
I - moment of inertia;
W - moment of resistance;
S - static half-cut moment;
i - radius of gyration.
4. I-beams from No. 24 to No. 60 are not recommended for new designs.
2. Nominal dimensions of I-beams, cross-sectional area, mass and reference values for axes must correspond to those given in table. 1.
3. I-beams are made according to the rolling accuracy:
increased accuracy - B,
normal precision - V.
4. Limit deviations in the size and shape of the cross-section of I-beams (Fig. 1-2) must correspond to those given in table. 2 .
b 1 - width of the shortened flange; b 2 - the width of the extended flange; D - shelf skew; f - wall deflection
Damn. 2
Table 2
Dimensions, mm
_____________
* Positive deviations are limited to maximum deviations in weight.
5. The deflection of the wall ( f ) must not exceed 0.15 S .
6. The curvature of the I-beam should not exceed 0.2% of the length.
7. Blunting of the outer edges of the flanges of I-beams of increased accuracy should not exceed 2.2 mm, for I-beams of normal accuracy it is not controlled.
8. Profiles are made in lengths from 4 to 12 m:
measured length;
multiple measured length;
unmeasured length.
By agreement between the manufacturer and the consumer, it is allowed to manufacture I-beams over 12 m long.
9. Deviations in mass of 1 m of an I-beam should not exceed plus 3, minus 5%.
By agreement between the manufacturer and the consumer, the deviation in mass without control of the thickness of the shelves and the I-beam wall should not exceed plus 3, minus 3% for I-beams up to No. 16 and plus 2.5, minus 2.5% for I-beams over 16. p>
10. Dimensions and geometric shape are controlled at a distance of at least 500 mm from the end of the I-beam.
The height of the I-beam is controlled in the Y - Y plane.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR, GOSSTROY of the USSR, Central Research Institute of Building Structures.
2. APPROVED AND PUT INTO EFFECT by the Decree of the USSR State Committee for Standards dated 09/27/89 No. 2940
3. The standard fully complies with ST SEV 2209-80
4. The standard corresponds to MS ISO 657/13
5. The standard is unified with BDS 5951-75, TGL 10369
6. REPLACE GOST 8239-72
7. The limitation of the validity period was removed according to the protocol No. 7-95 of the Interstate Council for Standardization, Metrology and Certification (IUS 11-95)
8. REVISED October 2001
