Great explanations throughout. Thank you!

Thank you so much Dr. It is very helpful. My semester of study for concrete design was just explained in less than a weeks.

@MrElgamal77

2 ай бұрын

Happy that it helped you

Thank you Dr. For these videos, please do on ribbed slab and flat slab.

استمر ياا دكتور المحتوى مفيد جدا.

Thank Dr. for this great work, kindly do vids on flat slab design.

thank you DR SHARIF

Doctor I loveeeeeee yooooouuuuu🌹🌹❤️❤️

Thank you very much sir

جزاك الله خير يادكتور نريد المزيد من المحاضرات وياحبذا اذا اشغلت مبني متعدد الطوابق

Great lecture , I have a question for the example solid slab with thickness 200 mm , does not it need a top reinforcement mesh to resist shrinkage stress ?

Please do you have a video on understanding bending moment and shear force calculation and diagram

Hi Dr.. Thank you for the much informative and valuable tutorials, one question though, from the structural analysis section, why are we using values for moments and shear, in table 3.12 from the simply supported section and not the continuous section? I thought the slab was continuous.

@ahmedalaamri5060

3 жыл бұрын

Continuous in the BS code refers to the continuity of slabs in that particular joint and not the reinforcement. To counteract the top moment and the partial fixity between the beam and the slab, BS8110 recommends certain top reinforcement at the simple end. All the best

When calculating A s-min should we take value of h as 175 or 145? Timeframe 12:11

@MrElgamal77

Жыл бұрын

175

Thanks Prof. You have made everything become so easy. I have a question please. This example you have solved, shows a one way continuous slab and its analyzed such as you have done, with the continuity in the shorter span. How about if the continuous spanning were to have been in the longer span of this same example?

@ahmedalaamri5060

3 жыл бұрын

The dominant side is always the short side and being moment is major towards that span and not the long span. All the best

@ahmedalaamri5060

3 жыл бұрын

The dominant side is always the short side and being moment is major towards that span and not the long span. All the best

@MrElgamal77

3 жыл бұрын

In one-way slabs, we do not design in the long direction. For longer span, we take only the minimum.

Salamu Alikum, would you please make some excel lecture on concrete design. thank you

Great explanations prof. You always makes things simple. I have a question on curtailment iam a bit confused on how to use c=0.15l I always use the 0.3l and disregard the 50% of c=0.15l Correct me if I may be wrong because I do that in real structures

@MrElgamal77

Жыл бұрын

What you are doing is correct and more safe.

Under "As required", "As provided" you could have explained how we arrive at those values...l got lost there..

Thanks doctor,could you please help on how to design ribbed and flat slab.

@MrElgamal77

4 жыл бұрын

I have first to prepare a video about footings.

Great work I have one question, how can I design the cantilever of one way slab?

@ahmedalaamri5060

3 жыл бұрын

You may take it as Wl2/2 or if you want to be more precise, redistribute the moment taking into account the top moment of the continuous part of the neighbour slab

Dear Dr. Sharif I confused difference between actual span/d and allowable span/d . what is actual span/d and allowable span/d ?

@ahmedalaamri5060

3 жыл бұрын

Allowable is the maximum allowed by the code, and the actual is whatever is happening in the slab you are solving sue to the provided thickness and reinforcement. These are reflecting the maximum allowed deflection and the actual deflection. All the best

Hi Dr. For the minimum steel, is the h not 175mm. You used 145mm

@MrElgamal77

4 жыл бұрын

Thank you. You are right. 145 was used by mistake.

any one plz how to find this As,req and spacing

When checking for deflection, what if the modification factor is greater than 2?

@ahmedalaamri5060

3 жыл бұрын

Reduce the thickness of the slab, the slab is thicker than required

@ahmedaweysmohamed6378

2 жыл бұрын

Take 2 as a modification factor

You are using BS8110 of which year ?

Good day sir, since this is a continuous structure why did you make use of simply supported moment formulas for the continuous beam

@MrElgamal77

2 жыл бұрын

I used the simply only at the end beam. This will be more safe as it gives higher +ve moment. At the connection of the slab with the end beam, we use minimum top reinforcement to consider for continuity.

from the beginning of the question you stated that diameter of bar is 10 and used that to calculate of the width of the slab. but in the middle of the calculation for reinforcement, you used a diameter of 8 (10:11) any explanation?

@MrElgamal77

Жыл бұрын

At the beginning, we assume 10 mm. Then we calculate the thickness and round it. After that, you can use any diameter provided that deflection and shear are fine. Changing from 10 to 8 or to 12 will have almost no effect.

Hi Dr. i have noted that in the calculation of reinforcement, at outer support, where the moment is 0, you have indicated that the Asmin = 189. in your previous lectures, you had indicated that the Asmin is derived from table 3.25, and in this case where fy =460N/mm2 and the section is rectangular, the minimum dimension of reinforcement is 0.13%. Upon calculation, i.e. 0.13% x 1000 x 175mm (b=1000mm, h= 175mm) you get Asmin as 227.5 mm , not 189 mm. Kindly comment. Regards,

@MrElgamal77

4 жыл бұрын

Hi Ezra. You are right. I think it was multiblied by d instead of h by mistake. Thanks.

Please what if the spans are not equal, can table 3.12 still be used?

@yaasirahmed1528

4 ай бұрын

yes , find average moments using adjacent length at interior supports

Why didn’t you use the values of the “continuous slab” instead of the simply supported

@MrElgamal77

3 ай бұрын

Because the last support is assumed simply supported. This is a conservative design and will give more positive momentum in the first span

please check the F at 9.32.You dont need to multiply the F by the length again when finding the moments since its already done at the top

@MrElgamal77

Жыл бұрын

No. You need to multiply it again by the length to get the moment. For shear, you do not.

Sr how did you get Area minimum= 188,5. 'cause i followed all your instructions but i got 227,5 can you pls make me understand

@engrxiddig

Жыл бұрын

There is a mistake

at 6:38 it says total design ultimate load = 12.08 KN/m^2. then next slide the force = 12.08 * 4.5 = 54 KN , how shouldnt it be 54 kN/m

@MrElgamal77

4 ай бұрын

Yes. It is correct. When you solve for 1 m strip, the 12.08 kN/m2 will be 12.08 kN/m. Then the resultant will be 12.08 × span (4.5)= about 54 kN

15:22 How did v =Vmax/(bd) give you 0.225??

@MrElgamal77

Ай бұрын

I do not remember. I prepared it a long time ago.

@MrElgamal77

Ай бұрын

I checked it. It = V/(bd)= 32.6*1000/(1000*145)=0.225

😚

0.0013x1000x175=227.5

@MrElgamal77

2 жыл бұрын

You are correct. The 188.5 was a mistake.

@agostinhoinocencio7013

2 жыл бұрын

@@MrElgamal77 thanks so much Sr i appreciate that

Very fast calculations not explained clearly

Thank you Dr. For these videos, please do on ribbed slab and flat slab.