Steel Materials and Products for Steel Building Construction

Steel Materials and Products for Steel Building

Construction

Developed

Country

Thailand Y = 5,359 X = 200

: downstream

Demand

70%-80%

Crude Prod.

~ 14 60%

Infra

SN Grade

Revise Extreme Event

Steel 33.1%

1996

Source:

5

Source:

Billet: Area > 36 in2

Bloom: Area < 36 in2

Source:

CFT = Column Filled Tube

. 1227

2539 JIS G3101

1995 JIS G3106

1995 JIS G3136

1994 BS 4360

1986

BS EN 10025 1986

ASTM 1997

SS400 SS490 SS540

SS400 SS490 SS540

43A 50A

A36

SM400 SM400A SM400B

SN400A SN400B

43B 43C

S275JR A572 Gr.42

SM490 SM490B

SM490 YA SM490 YB

SN490B

50B 50C

S355JR A572 Gr.50

A992

SM520 SM570

SM520B SM570

Source: www.syssteel.com

. 1227-2539

( )

. 1228-2549

( )

Material

Grade

Chemical Composition (%) Mechanical Properties

C

Max

Si

Max

Mn

Max

P

Max

S

Max

Yield

Strength

N/mm2.

Tensile

Strength

N/mm2.

Elongation

(%)

t 5 t >5

SSC 40 0.25 - - 0.05 0.05 245 400 - 510 21 17

( )

. 107-2533

Source: www.pacificpipe.co.th

( )

. 276 & 277-2532

( )

. 107-2533

Source: www.pacificpipe.co.th

( )

.. 2544 .. 2522

( 2) .. 2535

( 3) .. 2543

( 4) .. 2549 .. 2522 48 (.. 2540) 60 (.. 2549)

.. 2552

( )

(1)

(2) 1,000

(3)

( )

23.00

10,000

2,000 15.00 1,000 2,000

( )

* (.)

150 x 150 . 50

300 x 300 . 25

*

200 x 200 . 40

50

( )

1 2

3

( )

1,000 8.00

ISO 834 ASTM E 119

Section Factor

The main factors affecting the behavior of steel structures in fire are: the elevated temperatures in the steel members; the applied loads on the structure; the mechanical properties of the steel; and the geometry and design of the structure.

Structural Steel Sections:

Temperature Calculation Protection Systems

( )

Section Factor: The ratio of the heated perimeter to the area or mass of the cross section The section factor is important because the rate of heat input is directly proportional to the area exposed to fire (S), and the rate of temperature increase is inversely proportional to the heat capacity of the member (cV) The section factor can be expressed as: S/V Heated surface area/Volume per unit length (m-1) Hp/A Heated perimeter/Area (m-1)

( )

( )

Section Factor: b

h Hp/A = 2(b+h) + 2(b t) A t

b

h Hp/A = 2(b+h) A

( )

Section Factor: b

h Hp/A = 2(b+h) A

D

Hp/A = D A

( )

Section Factor:

h Hp/A = 2(b+h) + 2(b t) b A t

b

h Hp/A = 2h + b A

b

( )

Fire Protection Systems:

Concrete encasement expensive, bulky and time-consuming Board systems calcium silicate or gypsum boards Spray-on systems (cement-based) wet & messy installation process, not suitable for decorative finishes Intumescent Paint swells up into a thick charry mass when heated, several coats required to obtain necessary thicknesses, high cost

( )

Fire Protection

Systems for Steel

ASTM E119 Fire Resistance Test

SubunitData

Logger

Computer

0.25 m

0.20 m

1.40 m

0.30 m

Buners

Themocouples

Themocouples

0.90 m0.30 m

( )

0

60

120

180

240

0 50 100 150 200 250 300 350 400

Hp/A (m-1)

FRR (min)

60

120

180 (1/138)

(18/138)

(122/138)

( )

Hp/A (m-1)

FRR (min)

60

120

180

(0/8)

(2/8)

0

60

120

180

240

0 50 100 150 200 250 300 350 400

( )

Hp/A (m-1)

FRR (min)

60

120

180

(0/10)

(7/10)

0

60

120

180

240

0 50 100 150 200 250 300 350 400

( )

0

5

10

15

20

0 20 40 60 80 100 120 140 160 180 200 220 240

0.0

0.2

0.4

0.6

0.8

1.0

0 60 120 180 240

Lower bound

Upper bound

Empirical distribution

Normal distribution

FRR (mins) FRR (mins)

Frequency CDF

P(FRR < 1hr) = 0.148 < 2hr) = 0.848

< 3hr) = 0.999

= 90.2 = 28.9

Thank you for your attention


Documents

Steel Materials and Products for Steel Building Construction