DESIGN & ANALYSIS OF RECTANGULAR RCC OVERHEAD WATER TANK

Transcription

1 DESIGN & ANALYSIS OF RECTANGULAR RCC OVERHEAD WATER TANK

2 Data: Size of water Tank 4.0m x4.0m x2.0m Height of water tank from GL =8.0m Water tank wall thickness =180mm Size of column = 300 x 300 mm Bracing beam =300 x 350mm Concrete grade M30 Steel Fe 415 grade 1.Creation of Geometry : File New Project Select Space Unit : Length =meters; Force=KN; File Name=RCC overhead tank Next Select Open Structure Wizard Finish. Change to Frame Models from Truss models Select Bay frame and double click on it. Length X=4m No. bays =1 Height Y=10m No. of bays =3 click Bay 1=4m Bay2=4m Bay3=2m; Width Z=4m No. bays=1 Apply Transfer model Click Yes Go to Front view icon (first view) Select tank portion for surface modeling. Isometric view Select surface meshing Quadrilateral meshing OK Division=10 Apply. Do first bottom, side 1, side 2, side 3 and side 4. To remove all beam elements, Select the tank portion except bottom of tank Delete 80 beams & associated Physical beams (if any) will be deleted Ok.

3 Fig.1 Isometric view of the model 2. Member Properties : Click General Define Rectangle YD=0.3m ZD=0.30m (column) Add. YD=0.35m ZD=0.30m (Beams at top and bracing) Add Thickness Node 1 to 4 =0.18m Add Close. High light column size 0.3 x 0.3 and select column portion by windowing Assign to selected beam Assign Yes. High light beam size 0.35 x 0.30 and select tank bottom beam and tank middle bracing beam Assign to selected beam Assign Yes. High light thickness and select tank portion Assign to selected beam Assign Yes Close. De select the member. 3.Supports : Front view Click Support Create Fixed Add Click support 2 and bottom most nodes of tank Assign to selected node Assign Yes Close. De select the nodes and change to beam cursor. 4. Loading : Click Load & Definitions Click Load case details Add. Primary Number 1: Loading type: none Title : load case 1 Add Close. Click Load case 1 Add.

4 For Bottom plate: Click plate loads Pressure on full plate Pressure =-20 GY Select bottom plate of tank portion Assign to selected plates Assign Yes. Fig. 2 Bottom plate chosen Fig. 3 Orientation of various sides of Plates

5 Left side wall: Load case details Add. Click plate loads Hydrostatic Select plates select left side plates Done. W1 =-20 W2= Y Local Z Add close.

6 Fig. 4 & 5 Left side plate chosen Fig. 6 Left side plate load application

7 Fig. 7 Left side hydrostatic pressure diagram Right side wall: Load case details Add. Click plate loads Hydrostatic Select plates Select right side plates Done. W1 = 20 W2=0.001 Y Local Z Add Close.

8 Fig. 8 Right side plate chosen Fig. 9 Rightside plate load application

9 Fig. 10 Rightside plate hydrostatic pressure application Back side wall: Load case details Add. Click plate loads Hydrostatic Select plates select rear side wall plate Done. W1 =- 20 W2= Y Local Z Add Close.

10 Fig. 11 Back or rear side plate selection Fig. 12 Rearside plate load application

11 Front side wall: Load case details Add. Click plate loads Hydrostatic Select plates Select front side wall plate Done. W1=- 20 W2= Y Local Z Add Close. Fig. 13 Frontside plate selection in top view

12 Fig. 14 Frontside plate hydrostatic load application 5. Analysis Type : Click Analysis/print No print Add. Click post print Define commands Analysis Results Add Close. Save the file before run the Analysis. 6. Analysis : From Main Menu ` Analysis Run Analysis Done. 7. Result : Go to post processing mode. Click deflection and see the deflection Diagram.

13 Fig.15 Deflection diagram in top view Fig. 16 Deflection diagram

14 Fig. 17 Front view deflection diagram Results Plate Stress contour Loads & Results Load case: Load case 1 Stress type: Mx (local) Ok. Fig. 18 BMD Mx top view

15 Results Plate Stress contour Loads & Results Load case: Load case 1 Stress type: My(local) Ok. Fig. 19 Stress contour My (local) Results Plate Stress contour Loads & Results Load case: Load case 1 Stress type: Max. Von Mis. Ok. Fig. 20 Max Von Mises

16 Fig. 21 Von mises Isometric view Results Plate Stress contour Loads & Results Load case: Load case 1 Stress type: Max. Absolute Ok. Fig. 22 Max Absolute

17 Fig. 23 Max Absolute top view Fig. 24 Max BMD in plates Maximum BMD Right click Plate stress contour Table.

18 Fig. 25 Max BMD Fig. 26 Plate stress contour table

19 Fig. 27 Summary