Project 1
Aim:
With the help of data provided following to be analyse, design & reinforcement detail to be provided:
- Raft foundation to be designed for span of 12m + 5.5m clear height considering 1 m width.
- Calculate all the possible loads acting over the bridges.
- LOad combination based model to be done.
- Anchorage length calculation to be given.
- Reinforcement details to be provided.
Introduction & Expalantion:
Following sheet provides the detail load calcualtion to be applied to the STAAD model. Also Base pressure check calculation provided.
| Design of Single cell Box Culvert | ||||
| 1 | Span and Cross section | |||
| Clear span | lc | 12.00 | m | |
| Height | hc | 5.50 | m | |
| Fill on top | fh | 1.50 | m | |
| Depth of Base slab | db | 0.90 | m | |
| Depth of top slab | dt | 0.85 | m | |
| Thickness of vertical wall | tw | 0.90 | m | |
| 2 | Material Properties | |||
| Grade of Concrete | fck | M35 | ||
| Grade of Steel | fyk | Fe500 | ||
| density of soil | 20.00 | kN/m3 | ||
| 3 | Load Calcualtions | |||
| 3.1 | Dead Load | |||
| Self weight of the structure can be calcualted directly in STAAD file under "Dead Load" case | ||||
| 3.2 | Earth Pressure | |||
| Thickness of top slab | dt | 0.85 | m | |
| Height of top haunch | ht | 0.15 | m | |
| Height of bottom haunch | hb | 0.15 | m | |
| Clear height between top & bottom slab | hc | 5.50 | m | |
| Thickness of bottom slab | dt | 0.90 | m | |
| Earth Pressure co-efficient | 0.50 | |||
| Earth pressure calcualtions based on divisions | ||||
| Wall height (Incrementals), m | Intensity of Earth Pressure, kN/m2 | |||
| 1.425 | 14.25 | |||
| 1.575 | 15.75 | |||
| 6.925 | 69.25 | |||
| 7.075 | 70.75 | |||
| 7.525 | 75.25 | |||
| 3.3 | Live load surcharge | |||
| Equivalent height (Soil fill ht.) | 1.50 | m | ||
| Uniform intensity of loading | 15.00 | kN/m2 | ||
| 3.4 | Live Load | |||
| 3.4.1 | Vehicle type | Class 70R, Tracked | ||
| Max Bogie load | 40.00 | t | ||
| Imapct factor | 10.00 | % | ||
| Final Load | 440.00 | kN | ||
| Clear distance | 1.22 | m | ||
| Width of track (transverse to traffic) | 0.86 | m | ||
| Width of track (along traffic) | 0.26 | m | ||
| Total width of vehicle | 2.79 | m | ||
| Width center to center of wheel | 1.93 | m | ||
| Wearing coat | wc | 0.00 | ||
| Effective depth of slab | d | 0.85 | m | |
| Height of soil fill | s | 1.50 | m | |
| b/lo | 0.91 | |||
| constant | k | 2.36 | IRC 112, Pg. 241 | |
| Carriage way width | bc | 12.50 | m | |
| Effective span | lo | 13.80 | m | |
| Distance of center of gravity from nearest support | x, max moment case | 6.29 | m | |
| x, max vertical load case | 0.13 | m | ||
| Tyre width across traffic flow | btw | 0.86 | m | |
| b1 = tyre width + 2*wc | 3.86 | m | ||
| b1 | ||||
| 3.4.2 | Effective dispersion width | |||
| Along the traffic direction | ||||
| beff | b+2*(wc + d + s) | |||
| 4.96 | m | |||
| Along the transverse direction | ||||
| beff | k*x(1 - x/lo) + b1 | |||
| beff, max moment case | 11.94 | m | ||
| beff, max vetical load case | 4.17 | m | ||
| 3.4.2.1 | Max. moment case | |||
| Longitudinal dispersion | 5.39 | m | ||
| Transverse dispersion | 9.55 | m | ||
| Dispersed load | 8.55 | kN/m for 1m width | ||
| 3.4.2.2 | Max.vertical load on wall | |||
| Longitudinal dispersion | 3.83 | m | ||
| Transverse dispersion | 5.64 | m | ||
| Dispersed load | 20.34 | kN/m for 1m width | ||
| 3.5 | Soil Fill | |||
| Fill height | 1.50 | |||
| Total Load | 30.00 | kN/m for 1m width | ||
| 3.6 | Vehicle type | Class AA | ||
| Tracked load | 70.00 | t | ||
| Imapct factor | 10.00 | % | ||
| Final Load | 770.00 | kN | ||
| Clear distance | 1.20 | m | ||
| Width of track (transverse to traffic) | 0.86 | m | ||
| Width of track (along traffic) | 3.60 | m | ||
| Total width of vehicle | 2.79 | m | ||
| Width center to center of wheel | 2.05 | m | ||
| Wearing coat | wc | 0.00 | ||
| Effective depth of slab | d | 0.85 | m | |
| Height of soil fill | s | 1.50 | m | |
| b/lo | 0.97 | |||
| constant | k | 2.36 | IRC 112, Pg. 241 | |
| Carriage way width | bc | 12.50 | m | |
| Effective span | lo | 12.90 | m | |
| Distance of center of gravity from nearest support | x, max moment case | 5.43 | m | |
| x, max vertical load case | 1.80 | m | ||
| Tyre width across traffic flow | btw | 0.85 | m | |
| b1 = tyre width + 2*wc | 3.85 | m | ||
| 3.6.1 | Effective dispersion width | |||
| Along the traffic direction | ||||
| beff | b+2*(wc + d + s) | |||
| 8.30 | m | |||
| Along the transverse direction | ||||
| beff | k*x(1 - x/lo) + b1 | |||
| beff, max moment case | 11.27 | m | ||
| beff, max vetical load case | 7.51 | m | ||
| 3.6.1.1 | Max. moment case | |||
| Longitudinal dispersion | 8.71 | m | ||
| Transverse dispersion | 9.31 | m | ||
| Dispersed load | 9.50 | kN/m for 1m width | ||
| 3.6.1.2 | Max.vertical load on wall | |||
| Longitudinal dispersion | 7.15 | m | ||
| Transverse dispersion | 7.43 | m | ||
| Dispersed load | 14.49 | kN/m for 1m width | ||
| 3.7 | Breaking Load | |||
| Load due to 70R | 700.00 | kN | ||
| Width of road | 13.50 | m | ||
| Effective span | lo | 10.37 | kN | |
| Load /m width | ||||
| 4 | Base Pressure Check | |||
| Support reactions from STAAD | 37.37 | kN | ||
| 19.035 | kN | |||
| 70.469 | kN | |||
| 124.936 | kN | |||
| 122.65 | kN | |||
| 122.66 | kN | |||
| 121.79 | kN | |||
| 122.66 | kN | |||
| 124.94 | kN | |||
| 70.47 | kN | |||
| 19.035 | kN | |||
| 37.37 | kN | |||
| Total Dead load reactions | 993.39 | kN | ||
| Reaction due to fill | 343.98 | kN | ||
| Reaction due to Live Load | 221.09 | kN | ||
| Total Dead load reactions | 99.00 | t | ||
| Reaction due to fill | 34.40 | t | ||
| Reaction due to Live Load | 22.11 | t | ||
| Total Load | P | 155.51 | t | |
| Area | A | 155.25 | m2 | |
| ZT | 275.5208333 | m3 | ||
| ZL | 299.48 | m3 | ||
| P/A | 1.00 | t/m2 | ||
| M/Z | 1.30 | t/m2 | ||
| Base Pressure (P/A+M/Z) | 2.30 | t/m2 | ||
| <8.0 | OK | |||
Follwing details shows, analysis & design of culvert in STAAD and the above calculated load applied.
| Clear Cover for earth face structural component | 50 | mm | ||||
| Clear Cover for inside face structural component | 50 | mm | ||||
| Clear Cover for foundation | 75 | mm | ||||
| S. No | Span Arrangement | m | ||||
| 1 | No of Cells | 1 | ||||
| 2 | Clear Span | 12.000 | ||||
| 3 | Clear Height | 5.500 | ||||
| 4 | Cushion | 1.500 | ||||
| 5 | Top Slab Thk. | 0.900 | ||||
| 6 | Bottom Slab Thk. | 0.900 | ||||
| 7 | External wall Thk. | 0.900 | ||||
| 8 | Width of BOX | 13.500 | ||||
| Bark Mark | Shape of Bars | Bar dia | Spacing | Hook length | ||
| 1 | 25 | 100 | 0.775 | |||
| 2 | 25 | 100 | 2.475 | |||
| 3 | 12 | 150 | 100 | |||
| 4 | 12 | 150 | 100 | |||
| 5 | 25 | 100 | 8.400 | |||
| S.No | Member | No. of items | Width of CW | Thickness | volume | |
| m | m | m³ | ||||
| 1 | Bottom Slab | 1 | 13.50 | 0.90 | 167.67 | |
| 2 | haunch | 2 | 13.50 | 0.20 | 0.54 | |
| Total Volume of Concrete for base slab in "m3" | 168.21 | |||||
| Base Width in "m" | 13.800 | |||||
| Bar Mark | Width | No of Bars | Length of Each bar | Total Length of Bars | Weight kg | |
| 1 | 13.40 | 134.00 | 15.25 | 2043.50 | 7874.34 | |
| 2 | 13.40 | 134.00 | 18.65 | 2499.10 | 9629.93 | |
| 3 | 12.00 | 80.00 | 13.60 | 1088.00 | 965.94 | |
| 4 | 12.00 | 80.00 | 13.60 | 1088.00 | 965.94 | |
| 5 | 13.40 | 134.00 | 15.25 | 2043.50 | 7874.34 | |
| Total weight in Kgs | 27310 | kg | ||||
| 27.31 | t | |||||
| 162 | kg/m3 | |||||
