Reinforced Concrete Design. Design of Slabs 1. ก ก ก ก ก Mongkol JIRAVACHARADET. Flat plate slab Flat slab Grid slab

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Transkript:

Reinforced Concrete Design Design of labs 1 ก ก ก ก ก Mongkol JIRAVACHARADET U R A N A R E E UNIVERITY OF TECHNOLOGY INTITUTE OF ENGINEERING CHOOL OF CIVIL ENGINEERING One-way slab One-way slab Two-way slab Flat plate slab Flat slab Grid slab

ก ก ก (DL) =,400 t ก 1 m 1 m t ก (LL) ก ก (DL) :, ก, ก ก,,, ก ก (ก.ก./. ) 1,658 t.5. 55.5. 80 (,645 t) 55 ก (,800 t) 60,400 t,550 t ก 1/ 15

ก : (L) > () L L t imple supports on two long edges only การแอ นต วเก ดข นบนด านส น = ก 1 4 L L ก

ก ก ก ก : ก L 1 m t 1.0 m ก ก : ก ก : n 10-15. ก -3. ก L / 0 L / 4 L / 8 L / 10 L n L n L n L n

ก ก ก ก ก ( ก ก ) ก A s ก A g : A s /A g 1 m RB4 (fy =,400 ksc).............. 0.005 DB30 (fy = 3,000 ksc).............. 0.000 DB40 (fy = 4,000 ksc).............. 0.0018 A g = b t = 100 t t DB (fy > 4,000 ksc)................ 0.0018 4,000 0.0014 pacing 3 t 45 cm f y Main teel (short direction): A s 6 mm Max. pacing 3 t 45 cm Min. pacing f main steel 4/3 max agg..5 cm 9.1 ก 1 ก ก 300 ก.ก./. ก ก 50 ก.ก./. ก f c = 10 ก.ก./. f y =,400 ก.ก./. 1) WD 1 t min = L/4 f y =,400 ksc 1.7 m,400 0.4+ = 0.74 7,000 70 tmin = 0.74 = 8.3 cm 4 ก t = 10 cm ก = 0.1 x,400 = 40 kg/m ก = 50 kg/m ก = 300 kg/m

ก = 40 + 50 + 300 = 590 kg/m WD ก ก.10. :. ก : M= 590.7 / 9= 477.9 kg-m + M= 590.7 /14= 307. kg-m. ก: M= 590.7 / 4= 179. kg-m ก ก : f s = 0.5x,400 = 1,00 ksc f c = 0.45x10 = 94.5 ksc 134 n= 9 10 1 1 k= = = 0.93 fs 1,00 1+ 1+ nf 9 94.5 1 1 R= fc k j= 94.5 0.93 0.90= 1.49 ksc c j = 1 0.93/3 = 0.90 ก ก RB9... WD d = 10-0.45 - = 7.55 cm ก : M c = R b d = 1.49 100 7.55 = 71,196 kg-cm = 71.0 kg-m > M ก OK ก ก : A s = M f jd s RB9 : A s = 0.636 cm pacing = 0.636 100/A s ก ก : A s,min = 0.005 100 10 =.5 cm UE RB9 @ 0.5 m M A s ก -477.9 5.85 RB9 @ 0.10 ก 307. 3.76 RB9 @ 0.16 ก -179..19 RB9 @ 0.9 0.5

WD ก : ก ก UE RB9 @ 0.5 m RB9 @ 0.5. RB9 @ 0.5. 0.7. 0.9. RB9 @ 0.10. 10. RB9 @ 0.16..7. 9.1 ก 1 ก ก 300 ก.ก./. ก ก 50 ก.ก./. ก f c = 10 ก.ก./. f y =,400 ก.ก./. 1) DM 1 t min = L/4 f y =,400 ksc 1.7 m,400 0.4+ = 0.74 7,000 70 tmin = 0.74 = 8.3 cm 4 ก t = 10 cm ก = 0.1 x,400 = 40 kg/m ก = 50 kg/m ก = 300 kg/m

ก w u = 1.4 (40+50) + 1.7 300 = 916 kg/m ก ก.10. :. ก : = = Mu 916.7 / 9 74.0 kg-m + = = Mu 916.7 /14 477.0 kg-m DM. ก: = = Mu 916.7 / 4 78. kg-m ก ก ( ก.5): d = 10-0.45 - = 7.55 cm ρ max = 0.0341 ก ก RB9... Mu ก ก : R = φbd n As 0.85 f c Rn ρ = = 1 1 bd f y 0.85 f c RB9 : A s = 0.636 cm pacing = 0.636 100/A s ก ก : A s,min = 0.005 100 10 =.5 cm UE RB9 @ 0.5 m DM M u A s ก -74.0 4.75 RB9 @ 0.13 ก 477.0 3.01 RB9 @ 0.1 ก -78. 1.73 RB9 @ 0.5 0.36 ก : ก ก RB9 @ 0.16..7. UE RB9 @ 0.5 m RB9 @ 0.5. RB9 @ 0.5. 0.7. 0.9. RB9 @ 0.10. 10.

ก ก Top bars at exterior beams Top bars at exterior beams Bottom bars Exterior span Temperature bars Interior span (a) traight top and bottom bars Bent bar Bent bars Bottom bars Exterior span Temperature bars Interior span (b) Alternate straight and bent bars RB9 @ 0.0 RB9 @ 0.10.. ก ก (ก, ) RB9 @ 0.10 m A s = 6.36 cm

ก L 1 4 L 1 3 Temp. steel L 1 8 L 1 RB9@0.18 RB9@0.10 1.0. 1.3. 4.0. RB9@0.07.13. RB9@0.18 RB9@0.14.13. RB9@0.07 1.0. 1.3. 4.0. Floor Plan 1/14 1/16 1/16 1/4 1/1 1/1 1/1

9. ก ก 500 ก.ก./ ก f c = 10 ksc f y =,400 ksc DM A 3 @ 1 m = 36 m A L n = 3.7 m L n = 3.7 m L n = 3.7 m ection A-A 1) Minimum depth : 0.4 +,400/7,000 = 0.74 Min. h = 0.74 370/4 = 11.4 cm UE h = 1 cm lab weight = 0.1,400 = 88 kg/m Assume beam + super DL : ervice DL = 350 kg/m ervice LL = 500 kg/m ) Factored Load : w u = 1.4 350 + 1.7 500 = 1,340 kg/m 3) Max. Moment : M u = 1,340 3.7 / 1 = 1,59 kg-m (Interior negative moment) Max. reinforcement ratio (from Table ก.5) : ρ max = 0.0341 UE RB9 with cm covering: d = 1--0.45 = 9.55 cm R M 1,59 100 = = = 18.63 kg/cm φ b d 0.9 100 9.55 u n ' 0.85 f c R n ρ = 1 1 = 0.008 ' f y 0.85 f c < ρ max = 0.0341 OK Required A s = ρbd = 0.008 100 9.55 = 7.83 cm /m RB9 : A s = 0.636 cm s = 0.636 100/7.83 = 8.1 cm elect RB9@0.08 : A s = 0.636 100/8 = 7.95 cm /m > Required As OK

Temp. steel = 0.005 100 1 = 3.00 < 7.95 cm /m OK elect RB9@0.0 : A s = 0.636 100/0 = 3.18 cm /m RB9 @ 0.0. ก ก RB9 @ 0.16. RB9 @ 0.08. 0.95. 1.5. + 0.55. RB9 @ 0.08. 0.95. 3.7. ก ก 1. 1 m 1 m ก 1 M = w t / 10 t for deflection control

ก ก 1.5 m 4.0 m Min. h = 150/10 = 15 cm UE h = 15 cm DL = 0.15,400 = 360 kg/m 5 m 1 LL = 00 kg/m w u = 1.4 360 + 1.7 00 = 844 kg/m 1.5 m DB10@0.40 DB10@0.0 DB10@0.40 t 0.50 0.55 0.95 0.95 1.30 0.10 0.0 3.80 0.0 M u = 844 1.5 / = 949.5 kg-m (per 1 m width) UE DB10 with cm covering: d = 15--0.5 = 1.5 cm R = M 949.5 100 = = φ bd 0.9 100 1.5 u n 6.75 ksc ρ = 0.85 f c R n 1 1 fy 0.85 f = 0.0017 < ρ min = 0.0035 Use ρ min Required A s = ρbd = 0.0035 100 1.5 = 4.38 cm /m DB10 : A s = 0.785 cm s = 0.785 100/4.38 = 17.9 cm Use DB10@0.17 : A s = 0.785 100/17 = 4.6 cm /m > Required A s OK Temp. steel = 0.0018 100 15 =.70 cm /m Use DB10@0.0 : A s = 0.785 100/9 =.71 cm /m

1.5 m DB10@0.40 DB10@0.0 DB10@0.40 t 0.50 0.55 0.95 0.95 1.30 0.10 0.0 3.80 0.0 DB10@0.0 DB10@0.17 DB10@0.34 DB10@0.17 0.15 0.10 DB10@0.0# 1.5 m 4.0 m ข อสอบภย ข อท : 1 แผ นพ นทางเด ยว ร บโมเมนต ด ดประล ย 1500 กก.-ม. ก าหนด fc = 80 ksc; fy = 400 ksc และถ าใช ปร มาณเหล กเสร มเหล กเสร มท ม อ ตราส วนเหล กเสร มร บแรงด งต อหน าต ดประส ทธ ผลส งส ดตาม มาตรฐาน ว.ส.ท. จงตรวจสอบหาค า d ท ต าท ส ดท สามารถออกแบบ ได (ว ธ DM) ρ 0.85 80 610 = 0.85 400 610+ 4000 b = ρmax = 0.75 0.05097 = 0.038 0.05097 R n, max =ρ f y ρ fy 1 1.7 fc 0.038 400 = 0.038 400 1 = 74.08 1.7 80 ksc M = φr u n bd d= M φr u n b 1500 100 = = 4.74 cm 0.9 74.08 100

ข อสอบภย ข อท : 18 แผ นพ นต อเน องม ระยะศ นย ถ งศ นย ของท รองร บ = 4.00 เมตร ต องร บ น าหน กบรรท กจรแบบแผ สม าเสมอใช งานเท าก บ 500 กก./ม. ถ าท รองร บสามารถร บโมเมนต ด ดได เท าก บ wl /4 จงใช ว ธ WD หา ขนาดและระยะเร ยงของเหล กเสร มท ประหย ด ตรงกลางช วงพ น สมม ต พ นหนา 0 ซม. เสร มเหล กร บแรงด งอย างเด ยวท ระยะ d = 15 ซม. fc = 150 กก./ซม. และ f y = 3000 กก./ซม. ต าแหน งแกน สะเท น kd = 5 ซม. ก + ก = 0. 400 + 500 = 980 กก./. ก M+ = 980 4 /14 = 110 กก.-. ก kd = 5. jd = 15 5/3 = 13.33. A s M f jd = = = 5.60. s 110 100 1500 13.33 ก 1. (A s = 1.13. ) s = 100 1.13/5.60 = 0.18. เสร มเหล ก 1 มม. @ 0 ซม.