มถ. 211 - 2550 มาตรฐาน เหล็กเส้น เสริม...
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2-17À¡«¥ß“π∑“ß
°√¡∑“ßÀ≈«ß™π∫∑ °√–∑√«ß§¡π“§¡
1. ¢Õ∫¢à“¬ ‡À≈Á°‡ âπ‡ √‘¡§Õπ°√’μ À¡“¬∂÷ß ‡À≈Á°‡ √‘¡„πß“π§Õπ°√’μ‡ √‘¡‡À≈Á°∑’Ë„™â∑”º‘«®√“®√
§Õπ°√’μ ´÷Ëß·∫à߉¥â‡ªìπ 2 ª√–‡¿∑£◊Õ ‡À≈Á°‡ âπ°≈¡ (Round Bar) ·≈–‡À≈Á°‡ âπ¢âÕÕâÕ¬
(Deformed Bar)
2. §ÿ≥ ¡∫—μ‘ 2.1 ‡À≈Á°‡ âπ°≈¡ (Round Bar)
μâÕß¡’§ÿ≥ ¡∫—μ‘μ“¡¡“μ√∞“πº≈‘μ¿—≥±åÕÿμ “À°√√¡ ¡Õ°. 20 : ‡À≈Á°‡ âπ‡ √‘¡
§Õπ°√’μ (‡À≈Á°‡ âπ°≈¡) ÷́Ëß¡’√“¬≈–‡Õ’¬¥¥—ßπ’È
2.1.1 §ÿ≥ ¡∫—μ‘∑“ß°≈ μ“¡μ“√“ߥ—ßπ’È :
‡°≥±å§«“¡§≈“¥‡§≈◊ËÕπ
Ì“À√—∫¡«≈μàÕ‡¡μ√™◊ËÕ¢π“¥‡ âπºà“π»Ÿπ¬å°≈“ß
(¡‘≈≈‘‡¡μ√)
‡°≥±å§«“¡§≈“¥‡§≈◊ËÕπ
‰¡à‡°‘π°«à“
(¡‘≈≈‘‡¡μ√)
¡«≈μàÕ‡¡μ√
(°‘‚≈°√—¡)‡©≈’ˬ√âÕ¬≈– ·μà≈–‡ âπ√âÕ¬≈–
RB 6
RB 9
RB 12
RB 15
RB 19
RB 22
RB 25
RB 28
RB 34
6
9
12
15
19
22
25
28
34
± 0.4
± 0.4
± 0.4
± 0.4
± 0.5
± 0.5
± 0.5
± 0.6
± 0.6
0.222
0.499
0.888
1.387
2.226
2.984
3.853
4.834
7.127
± 5.0
± 5.0
± 5.0
± 5.0
± 3.5
± 3.5
± 3.5
± 3.5
± 3.5
± 10.0
± 10.0
± 10.0
± 10.0
± 6.0
± 6.0
± 6.0
± 6.0
± 6.0
2.1.2 ‡°≥±å§«“¡§≈“¥‡§≈◊ËÕπ ”À√—∫‡ âπºà“π»Ÿπ¬å°≈“ߢÕ߇À≈Á°‡ âπ°≈¡μ“¡μ“√“ߥ—ßπ’È :
¡∂.¡∂. 211-2550 211-2550
¡“μ√∞“π‡À≈Á°‡ âπ‡ √‘¡§Õπ°√’μ¡“μ√∞“π‡À≈Á°‡ âπ‡ √‘¡§Õπ°√’μ
°“√∑¥ Õ∫¥â«¬°“√¥—¥‚§â߇¬Áπ
‡À≈Á°
‡ âπ°≈¡
§«“¡μâ“π
·√ߥ÷ß
∑’Ë®ÿ¥§≈“°
‰¡àπâÕ¬°«à“
(°°./μ√.´¡.)
§«“¡μâ“π
·√ߥ÷ß
Ÿß ÿ¥
‰¡àπâÕ¬°«à“
(°°./μ√.´¡.)
§«“¡¬◊¥„π™à«ß
§«“¡¬“« 5 ‡∑à“¢Õß
‡ âπºà“π»Ÿπ¬å°≈“ß
‰¡àπâÕ¬°«à“
(√âÕ¬≈–)
¡ÿ¡°“√¥—¥
(Õß»“)
‡ âπºà“π»Ÿπ¬å°≈“ß
«ß¥—¥
SR 24 2,400 3,900 21 180
1.5 ‡∑à“¢Õ߇ âπºà“π
»Ÿπ¬å°≈“ß√–∫ÿ1.5 ‡∑à“¢Õß
‡ âπºà“π»Ÿπ¬å°≈“ß√–∫ÿ
2-18 À¡«¥ß“π∑“ß
°√¡∑“ßÀ≈«ß™π∫∑ °√–∑√«ß§¡π“§¡
2.2 ‡À≈Á°¢âÕÕâÕ¬ (Deformed Bar) μâÕß¡’§ÿ≥ ¡∫—μ‘μ“¡¡“μ√∞“πº≈‘μ¿—≥±åÕÿμ “À°√√¡
¡Õ°. 24 : ‡À≈Á°‡ âπ‡ √‘¡§Õπ°√’μ (‡À≈Á°¢âÕÕâÕ¬) ÷́Ëß¡’√“¬≈–‡Õ’¬¥ ¥—ßπ’È
2.2.1 §ÿ≥ ¡∫—μ‘∑“ß°≈ μ“¡μ“√“ߥ—ßπ’È :
À¡“¬‡Àμÿ §«“¡μâ“π·√ߥ÷ß∑’Ë®ÿ¥§≈“° = Yield Stress
§«“¡μâ“π·√ߥ÷ß Ÿß ÿ¥ = Maximum Tensile Stress
§«“¡¬◊¥ = Elongation
°“√∑¥ Õ∫¥â«¬°“√¥—¥‚§â߇¬Áπ = Cold Bend Test
¡ÿ¡°“√¥—¥ = Bending Angle
‡ âπºà“π»Ÿπ¬å°≈“߫ߥ—¥ = Diameter of Bends
™à«ß§«“¡¬“« 5 ‡∑à“¢Õ߇ âπºà“π»Ÿπ¬å°≈“ß = Gauge Length
°“√∑¥ Õ∫¥â«¬°“√¥—¥‚§â߇¬Áπ
—≠≈—°…≥å
§«“¡μâ“π
·√ߥ÷ß
∑’Ë®ÿ¥§≈“°
‰¡àπâÕ¬°«à“
(°°./μ√.´¡.)
§«“¡μâ“π
·√ߥ÷ß
Ÿß ÿ¥
‰¡àπâÕ¬°«à“
(°°./μ√.´¡.)
§«“¡¬◊¥„π™à«ß§«“¡
¬“« 5 ‡∑à“ ¢Õ߇ âπ
ºà“π»Ÿπ¬å°≈“ß
‰¡àπâÕ¬°«à“
(√âÕ¬≈–)
¡ÿ¡°“√¥—¥
(Õß»“)‡ âπºà“π»Ÿπ¬å°≈“߫ߥ—¥
SD 30
SD 40
SD 50
3,000
4,000
5,000
4,900
5,700
6,300
17
15
13
180
180
90
4 ‡∑à“‡ âπºà“π»Ÿπ¬å°≈“ß√–∫ÿ
5 ‡∑à“‡ âπºà“π»Ÿπ¬å°≈“ß√–∫ÿ
5 ‡∑à“‡ âπºà“π»Ÿπ¬å°≈“ß√–∫ÿ
2.2.2 ‡°≥±å§«“¡§≈“¥‡§≈◊ËÕπ ”À√—∫¡«≈μàÕ‡¡μ√¢Õ߇À≈Á°¢âÕÕâÕ¬ μ“¡μ“√“ߥ—ßπ’È :
‡°≥±å§«“¡§≈“¥‡§≈◊ËÕπ Ì“À√—∫¡«≈μàÕ‡¡μ√¢Õß∑ÿ°¢π“¥™◊ËÕ¢π“¥
¡«≈μàÕ‡¡μ√
(°‘‚≈°√—¡) ‡©≈’ˬ (√âÕ¬≈–) ·μà≈–‡ âπ (√âÕ¬≈–)
DB 10
DB 12
DB 16
DB 20
DB 22
DB 25
DB 28
DB 32
0.617
0.888
1.578
2.466
2.984
3.853
4.834
6.313
± 3.5 ± 6
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