Design of column footing

[Music] click on the subscribe button and press the blank watching more update you assalamualaikum friends this is Sami and you're watching civil engineers YouTube channel difference today my topic is too much important and many student they were asking about this topic that how we can design column footing okay so design of column footing but this is the square column footing design right so if you need the article about this kind of article new information notes about civil engineering so there are a lot of notes and a lot of article about civil engineering and I update my website daily for civil engineers so you are able to visit my website www.africanelements.org but remember like this video and subscribe this channel and just visit to our website wo wo wo dot server global.com if you need the article so the link is in the description of this video so visit and read your articles and get new information and latest information ok let's start but like this video and subscribe this channel for more update videos so design of column footing okay so this is a steel column so when you want to design the column so how much steps are required for us to design a column okay so let's come on so design of column required steps the first one step we we need to find out the area footing okay so this is a column and this is a footing so what will be the area of footing first tip okay and second one we need the syle reaction okay we need the syle reaction okay to design a column footing and little one we need factor moment okay in fact our moment so this is a column okay and this is the footing and we need the factor moment for the critical section for the bending moment and this is a need to find out the steel and design of steel okay factor and the last one we need to find out the required depth okay for the column okay so this is the column this is the column okay and this is the footing so this is the depth of the footing okay wait what will be the depth of the footing okay in design of column so column footing depth is equal so now this is the column okay and this is the what we can say footing okay and this one is a bearing capacity of soil okay and the applied load on the column okay which is 2000 kilonewton but this is the square footing okay let's start first of all footing area second one we need soil reaction third one we need factor moment and fourth one column footing depth but keep in your mind this is the part first video in part part second video I will also show you how to design the steel and quantity of Steel for this column okay and the column size is 200 millimeter by 200 millimeter so what will be the area of the footing right okay so given data we required here so P applied load which are coming on the column that is 2000 kilo Newton so you are able to change it okay so you can put anything's here so the size of column I've already told you that the size of the column is here which is 400 millimeter by 400 millimeters okay and SBC cell bearing capacity of okay cell bearing capacity which is 150 kilonewton per meter square and 150 kilonewton per meter square cell bearing capacity you are able to get from the lab test okay so there are the menís i'll end menace i'll has different strengths are a bearing capacity okay so this is a column this is a footing and this is the bearing capacity okay and this bearing capacity I have here 150 kilonewton per meter square okay for the different type of soil we have a different bearing capacity okay there is also my article in my website in several global calm and also I have a video in this channel you are also able to read the article entry to watch the video okay and we will use to design the column so we will use the M 20 grade of concrete keep in your mind M 20 okay grade of concrete so FC this is the type of steel okay the iron steel grade so which I will use here for 15 okay so f ck this is the compressive strength of the concrete 20 Newton per mm square because I'm using here the M 20 grade of concrete so 20 Newton per mm square is the compressive strength of concrete okay and FY is a yield stress okay our strength okay so this is the 450 Newton per mm square for the FC okay for this grade of Steel so now come to start the in required test the first one step the first one area of footing okay so the first one area footing so first of all we have to increase the ten person above load okay so this is the P which is 2000 kilo Newton so we will increase 10 percent okay so from 10 percent you can get the video okay then divide by 100 and multiply with two thousand it will give you two hundred two thousand and two hundred kilo Newton okay so this is the increase so formula to find out the area of columns the area is equal ten percent of P plus P divided by SBC okay ten percent which is this one okay and of P so this is P okay so it will give you twenty two hundred plus P P again which one this one P okay so from this you can get again sorry again P is this one yes sir area is equal as busy as a cell bearing capacity or castle bearing capacity which is 150 okay 150 kilonewton per meter square now here we have a yes okay so now we have to find out the area of the column so for that area is equal to zero point one ten percent will become zero point one of two thousand plus 2000 okay and divided by SBC so SBC we have here we have a SBC 150 kilonewton per meter square so divided by 150 is equal to 20 200 divided by 150 is equal 14 point 6 6 meter square who will be the area of the column for the size of 400 mm by 400 mm when we applied the Lord 2000 kilonewton right now the footing size area okay is equal area under root will fourteen point six six so it will give the one side of the column okay so this is a column footing okay and it will give you the s because this is square so s is equal four meter how because fourteen divided by fourteen point six six under root it will give you three point two eight meter so say four meter so one side is equal four metal and other side is equal four meter and the area will be what they level fourteen point six six so the one step is being clear now we need side reaction okay so silo reaction here yes side reaction so for the side reaction we have a symbol Q you okay formula P you divided by area of the column so here P U is equal P multiplied 1.5 so this is the factor wrote for the column okay P you mean Specter load of column so P already we have a twenty two hundred multiplied one point five so it will give us three thirty 3300 kilonewton okay this is the P you okay now for the formula we use qu is equal P u divided by area so P you already this one and area we have a fourteen point six six okay which is this one okay area of column right so from this you can get the side reaction okay which become twenty-two to 225 point 10 kilonewton per meter square okay now we need the third one step that is factor moment so formula we can use mu is assemble for the factor moment okay so mu is equal to P means load applied load which is a twenty two hundred okay and multiplied be breath of the s breath of the footing okay multiply n 2 L minus 3 L is also same like breath okay and D is a depth our breadth of the column breadth of the column and this one is a also length of the footing okay and divided by true and because this is look at this I will show you there this is the factor moment okay so for the victor moment we have to find out the one side okay if this is this one or this one or this one okay and this is the column which is 400 by 400 okay so I have to find out the one so it will is equal to all of all of side okay so a critical section for bending moment okay so for that we have to find out so therefore we do it / - because one side and other side we have to find out the one side okay so L minus D so L as a length of the footing NDA's a depth are the breadth of the column which is a 400 mm okay and all all square and divided by 2 1 divided by 2 because this is a two side okay therefore so mu is equal mu is equal P we have a the video of the fee 2200 okay this is the applied load multiplied for 4 as the side of the column okay be our B okay and n 2 for L LS already if you said this is L R this is L again this is 4 and subtract subtract D so D as a okay the column depth we can say are we gonna say length or the bridge so I've taken just the one 400 mm so 400 mm will be changed to the meter because we have to find out the defector moment in kilonewton so therefore 0.40 we will divide it by what we can say this is a we have to change to a meter okay divided by 100 so it will give us meter right so sorry thousand okay so for that we have to find out now / - and old square divided by 1/2 it will give you 17 20 kilonewton meter not permitted because this is not the unit okay so kilonewton meter okay now we have to find out the required depth for this column footing okay so look at this so now we have to find out the depth of the column footing okay what will be that if T is already done and now we require the tip okay sound action already done factor moment has all region okay now we have to find out the required depth G formula we can use it is equal to mu mu vector moment right and from vector moment divided by 0.138 is a constant for this depth multiply f ck and f ck is a 20 kilonewton per mm 20 Newton per mm square okay so this is the strength of the compressive strength of the concrete n multiplied B okay and what is B we have our B as already the breadth of our the length of the column footing okay so from this you can say a 17 a 20 is this 117 air 20 sorry a 20 I have written here 17 a 20 years 17 8 20 okay 17 a 20 multiply 10 power 6 that's why I put because I have to change it to Newton per mm square so therefore we will multiply it with 10 power 6 okay multiplied divided by zero point one three eight this one and f ck is a 20 Newton per mm square multiplied by ASA 4,000 mm okay so it will give us the depth of the column footing which is 401 mm okay so now depth of the column will become what 400 depth will come here 400 and D is equal 401 mm okay so this is the depth for the this column footing okay so this is the important topic for today and in next lecture I will show you how to design a steel and percentage of the steel are required in this column footing okay so you must visit to my website and like this video and subscribe this channel for more update videos thank you all the best bye

Channel: Civil Engineers

Views: 729,101

Keywords: Design of column footing, Design of square column footing, how to desgin a coumn footing, Design of rectangular column footing, column footing design, design footing, how to design a column, formulas to design a column, Formulas to desgin a column footing

Id: C3OMuBAblvQ

Length: 13min 44sec (824 seconds)

Published: Fri Dec 08 2017