Project 1
Aim:- Analysis & Design raft foundation of a box culvert bridge having 12 M span and 5.5 M height in STAAD pro and applying loads as per IRC 6.
Que 1) Calculate the loads to be applied on the box as per IRC 6.
Given Data:-
- The span of structure = 12 M
- Height of structure = 5.5 M
- Safe bearing capacity of soil = 80 kN/m2
- Wearing coat fill on structure = 1.5 M
- Haunch size = 200 x 200 MM
- Soil density = 18 kN/m3
- Concrete M35
- Steel Fe500
Assumption and Design Data:-
Span in model = 12.7 M
Height of structure = 6.15 M
| No. of Cell | = | 1 | ||
| Clear Span (skew) | = | 12.00 | M |
| Clear Height at outer edge | = | 5.50 | M | |
| Clear Height at median edge | = | 5.50 | M |
| Width of Box | = | 12.50 | M | |
| Carriage Width | = | 11.50 | M | |
| Width of crash barrier | = | 0.50 | M |
| Width of Haunch | = | 0.20 | M | |
| Depth of Haunch | = | 0.20 | M |
| Depth of top slab | = | 0.60 | M | |
| Depth of bottom slab | = | 0.70 | M | |
| Depth of External Vertical wall | = | 0.70 | M |
| Safe Bearing capacity | = | 80.00 | KN/m2 | |
| Allowable Settlement | = | 75.00 | mm | |
| Spring Constanrt | = | 1066.67 | KN/m3 |
| Density of concrete | = | 25.00 | KN/m3 | |
| Bulk Density of soil | = | 18.00 | KN/m3 | |
| Density of submerge soil | = | 10.00 | KN/m3 | |
| Density of profile corrective course | = | 25.00 | KN/m3 | |
| Density of fill | = | 18.00 | KN/m3 | |
| Coefficient of earth pressure at rest | = | 0.50 |
| Maximum air shade temp. | = | 40.00 | 0/C | |
| Minimum air shade temp. | = | 12.50 | 0/C |
| Max Live Load on box for breaking force calculation | = | 700.00 | KN | |
| Design parameter | ||||
| Grade of Concrete | = | M | 35 | |
| Grade of Steel | = | Fe | 500 | |
| Clear cover for earth face structural component | = | 75 | mm | |
| Clear cover for inside face structural component | = | 50 | mm | |
| Clear Cover for foundation | = | 75 | mm | |
| Data for STAAD input | ||||
| No. of division of Bottom Slab | = | 10 |
Procedure Creating 2D STAAD model
Creating a 2D model using a grid model with appropriate dimensions. For making a frame considering the centerline from both sides and assign proper distance nodes for haunches. after that we need to assign the properties to the structure with appropriate size. then we need to assign the support as fix but support then adding spring constant using calculation. spring constant calculated on the basis of safe bearing capicapity of soil.
Model Creating.
Assigning Material Properti.
Assigning Support
3D Model