The high speed Class 395 fleet services are orchestrated from the Hitachi Rail depot in Ashford. The management team have a vision of replacing clipboards with iPads so that the depot, their suppliers and clients can share live information. Hitachi engineers make spreadsheets wh...
BUOYANCY ANALYSIS FOR CONCRETE PIT OR TANK This Excel calculation can be downloaded by ExcelCalcs subscribers.Please login or Subscribe.
"BUOYANCY" is a spreadsheet program written in MS-Excel for the purpose of performing a buoyancy analysis, checking the resistance to flotation, for either an open or buried/enclosed rectangular concrete pit or tank.
This program is a workbook consisting of three (3) worksheets, described as follows:
Open Pit or Tank
Enclosed Pit or Tank
Program Assumptions and Limitations:
1. This program is based on the Archimedes Principal on buoyancy which is stated as follows:
"Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object". Thus, the volume of water displaced by the object multiplied times the unit weight of water is equal to the buoyant force.
2. Use of "overhangs" (extensions) on the pit/tank base allows the user to account for a "block or wedge" of soil around the periphery of the concrete pit/tank.
3. For soil above the water table, the dry unit weight is used for determining the weight considered to contribute in resisting flotation. For soil below the water table, the submerged weight (gs - gw) is used for determining the weight considered to contribute in resisting flotation.
4. The full concrete unit weight is used for the walls, base, top slab (if applicable), and tributary grade slab (if applicable) as weight considered to contribute in resisting flotation.
5. The total weight resisting flotation is the sum of the pit/tank concrete weight, the tributary grade slab weight (if applicable), the unsubmerged soil weight, and the submerged soil weight.
6. The total "buoyed volume" is determined as the total volume of water which is displaced by the pit/tank.
7. The total "buoyant force" is then determined by multiplying the "buoyed volume" times the unit weight of water.
8. The factor of safety against flotation is the total weight resisting flotation divided by the total "buoyant force".
9. This program assumes a Factor of Safety >= 1.2 to be satisfactory, taken against the highest anticipated water table level. This also allows for some uncertainty in the contributing factors and variables. Where the weights calculated are well established, this Factor of Safety could be reduced to 1.1. In determining the Factor of Safety, allowance should be made for future removal of weight, for example the removal of soil.
10. This program contains “comment boxes” which contain a wide variety of information including explanations of input or output items, equations used, data tables, etc. (Note: presence of a “comment box” is denoted by a “red triangle” in the upper right-hand corner of a cell. Merely move the mouse pointer to the desired cell to view the contents of that particular "comment box".)
Check the version history to see how this calculation has changed over time. Use the Subscribe button to receive an automatic email should this calculation be updated to a higher version. Use the Favourite button so you can easily find this calculation in the future.
- Submitted On:
- 25 Feb 2012
- Submitted By:
- File Date:
- 25 Feb 2012
- File Version:
- File Size:
- 130.50 Kb
- File Type:
- HTML Link:
- Copy code below to your web page to create link to this page:
- HTML Window:
- Copy code below to your web page to create a dynamic window to this download:
- Like This?:
- View the profile of the person who submitted this calculation and see all their other calculations hosted at ExcelCalcs.
- Need Help?:
- Use the comment feature below to raise any questions relating to this download. The question will be automatically emailed the author and all users subscribing to this comment thread.
Just imagine if you could design your own App linked to a cloud data engine and working on any PC, tablet or smartphone……well now you can! You design your App in Excel. We make it device independent. We supercharge with our cloud data engine. You control access...
"Thanks again for your excellent course this past week." "Thank you for the course last week, found it very interesting both from the perspective of a quick refresh, but also on how we can optimise the work we do." "Thanks for a very interesting and usef...
I am pleased to report that XLC Ribbon works with the 32bit and 64 bit versions of Excel 2013 obtained using the free Office 365 Home Premium Preview. Excel 2013 looks a little flat and dull compared to previous versions but I think this is the influence of the new Windows 8 'metro' look and f...
New!XLC Ribbon For the first time XLC works with both 32 bit and 64 bit versions of Excel with an enhanced Office Ribbon display. It is a much simpler installation process than the previous Toolbar versions so you can be up and running in no time at all. ...
Hitachi have recently been awarded the largest ever UK rolling stock order and they’ll be bringing their Shinkansen bullet train technology to Europe. In August ExcelCalcs braved the stifling Japanese heat to deliver their ‘Fatigue of Welded Structures’ course to Hitachi b...
Our XLC software is a mathematical add-in for Excel. Generating equations direct from cell formulas it is an essential verification tool for engineers. Furthermore the ExcelCalcs community is the world’s most active producer of Excel solutions to engineering problems. The table below shows w...
Like a child selecting parts to construct a Lego model engineers bring together blocks of science to create new designs. These building blocks could be a load calculation, a beam calculation, a weld calculation, a fatigue calculation or any other calculation from a myriad of engineering topics. As...
The site is optimised for browsing on mobile devices like the iPhone or Android phones. To create a web app icon browse to http://www.excelcalcs.com/navigate/ and ‘Add to Home Screen’. You will find an icon much like an app icon on your home screen which will bring you straight back...