TM TKCS

1.1 S liu u vo1.1.1 Data of Post-tensioning Slab ( S liu ca sn DUL) Thickness (Chiu dy): d = 220~230 mm, h dm xem bn v

Concrete Grade (Mc Btng): fcu = 30Mpa, (M400) Steel Grade (Mc thp): fst = 490Mpa(Hin nay, thp ng knh 8mm, khng c thp 490. (cng thp 490 c hin nay trn th trng ch l thp cn ngui), khng ph hp vi tiu chun thit k. ngh i li thp 490 thnh 390 cho thp sn.

Strand Grade (Mc cp): ASTM, 0.5, A416, Grade 270 Stress Force per strand ( Lc ko cho 1 si strand)

F = 80% Ftk Friction factor: m = 0.2

Wobble factor: k = 0.004( 2 gi tr ma st v sai s lp t trn khng thuc min gi tr quy nh trong EC2 yu cu n v thit k gii thch ti sao li ly gi tr trn

1.1.2 Loading Cases (Cc trng hp Ti) SelfWeight (Ti trng bn thn):

25.0 kN/m3. (SW)

Superimpose Dead Load (Ti H.Thin):1.5 kN/m2. (SDL+WL) Xem Hnh Live Load (Hot ti):

1.5 kN/m2. (LL) Xem Hnh PT Load ( Ti Cp):

Xem Hnh. (PT)1.1.3 T hp ni lc theo cc trng thiSTTComboSWSDLLLPT

1Deflection - Net1.001.000.500.67

2SLS1.001.001.000.82

3Transfer1.001.00

4ULS - Final1.351.351.500.82

5ULS1.351.351.5

( Yu cu n v thit k gii thch t hp Deflection Net v gi tr mt lc PT = 0.82 & 0.671.1.4 Tiu chun v qui phm p dng BS8110-1997: Tiu chun thit k (khng s dng tiu chun ny) EUROCODE 2-2004: Tiu chun thit k TCVN 2737-1995: Ti trng v tc ng ngh ch s dng mi EUROCODE 2-2004.

1.1.5 Phn mm c s dng Cubus: Phn tch kt cu sn DUL Etabs: Phn tch tng th CT Cc file tnh ExelHin nay thit k cha a cc ng sut pht sinh do:

Gi

ng t

V cc chuyn v cng bc vo kim tra s lm vic ng thi gia m hnh tng th v m hnh sn ri rc.

ngh a cc ng sut pht sinh ny vo sn, ng thi a ng sut ko cng ca sn vo kim tra ct vch.

KT LUN:1. ngh n v thit k iu chnh nhng cc kin nu trn.

2. Thng nht ch thit k 1 tiu chun theo EUROCODE 2-2004.3. V khi lng cp th s khng thay i nhiu nn cng tc nhp cp s khng thay i.

4. Ch iu chnh thp sn.

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