A clarification: for the spacing determination, the top of the beam in your example fixed end beam is in Tension. Also, you mention dividing by two because there is also a bottom row of nails. While you do come up with the correct answer, the reason you divide by two is because there are two shear planes at the top of the member, as there are also 2 shear planes under the neutral line. Since you are looking at the top of the member the total shear in tension should be divided by two since there are two shear planes in tension.
Thank you so much for this great video I just have one question why did u consider the centroid of the middle rectangle only ? isnt the centroid equals to 3.75
There's a bit of confusion. You said after concluding your final answer for their respective distances, that B and C need to be 5.1" and 8.5" apart respectively from the other nails. When I see the total length of the square beam, it's only 7.5". That seems a little confusing however Hats Off to your way of teaching. You're a life saver for many!
Yaa dimi ama krdş gerçi sen bu dersi geçmişindir ama yinede soriyim. 7:24 diyor ki hoca simetrik olmalı ve benim amacım nail için gerekli shear ı bulmam ama orada ben simetrik kuralını uyguladığımda tahtayı kırmam gerek, ee ben nasıl hesaplıyabilirim ki kitap daki çözüm de aynı
if it has to be a symmetric plane, for Q_c, why doesn't it shear off vertically downward? is it because all of these equations have to do with reference to the neutral axis, so we can't cross it with our symmetric plane?
Professor would you have to calculate 2 different I values if the sides of the beam were not all symmetrical? Meaning would you have to calculate for Iy and Ix? Or do you just use Ix as you have in this video? Awesome content thanks!!
Mr Hanson I have an exam after tomorrow and I'm trying to reach my professor but he's too busy to give me 5 minutes to explain me the concept of the point of contraflexure in maximum shear and bending moment lesson would you please help me sir? you will really save me and my class
How does q build on this section. Does it start from zero at mid point and travel left and right of cross section. I don't see why there has to symmetry as you mention. I am missing the reasoning
Professor, in my class we learn that I=Summation[(bh^3)/12 + A'y'(bar)], yours is different. Just Summation[bh^3/12]; does it still work this way?? The y(bar) is different too, it is y(bar) = Summation[y(bar)(i)*A'(i)]/Summation[A'(i)]... i: each numbered section.
Hi, for the area in Q, arent we supposed to take the area that is affected by the nail? For example at point b, the area that is affected by the nail at b is the one below the nail.
technically the centroid doesn't belong to one specific point, it is the average distribution of an area or volume. The centroid for the first section vs the second section doesn't shift vertically, but it does shift horizontally (but that doesn't matter in this problem)
A clarification: for the spacing determination, the top of the beam in your example fixed end beam is in Tension. Also, you mention dividing by two because there is also a bottom row of nails. While you do come up with the correct answer, the reason you divide by two is because there are two shear planes at the top of the member, as there are also 2 shear planes under the neutral line. Since you are looking at the top of the member the total shear in tension should be divided by two since there are two shear planes in tension.
thanks I was wondering this too, I think you explanation is on the spot
I love these videos! It's so great to be able to pause the lecture when I need to think :D
Thank you so much! Your lessons are way more effective than my teacher's.
First, and maybe the only, lesson I am not convinced with. Things didn't seem so clear. But still pure class.
it's a very difficult concept to understand, he himself said so in lesson 33.
you're not alone
@@leftenantthunder i feel like he just explained it poorly this time.
KANKA BU KONUYU HOCADA COK IYI BILMIYO BOSVER
UZAYA ROKET MI ATCAN SANKI GECTIYSEN TAMAM ISTE
Prof. Hanson greeting from Peru! Your videos are helping me out so much. Finally undesrtood how to get Q for composite beams hahaha. THANKS
Wonderful solids lessons!! really taking the time to explain the problems along with a good sense of humor :))
Can you do a thin walled member example for shear flow. Both shear flow examples you did were built up members.
Thank you so much for this great video I just have one question why did u consider the centroid of the middle rectangle only ? isnt the centroid equals to 3.75
man i love you
There's a bit of confusion. You said after concluding your final answer for their respective distances, that B and C need to be 5.1" and 8.5" apart respectively from the other nails. When I see the total length of the square beam, it's only 7.5". That seems a little confusing however Hats Off to your way of teaching. You're a life saver for many!
the cross section is 7.5". The actual beam itself doesn't have a listed length in this problem.
@@user-sy1we3od1k You just cleared up my brain stuff, thanks!
Thank you so much, sir!
Heykelini diksek beton yetmez hocam
Yaa dimi ama krdş gerçi sen bu dersi geçmişindir ama yinede soriyim. 7:24 diyor ki hoca simetrik olmalı ve benim amacım nail için gerekli shear ı bulmam ama orada ben simetrik kuralını uyguladığımda tahtayı kırmam gerek, ee ben nasıl hesaplıyabilirim ki kitap daki çözüm de aynı
@@ahykn Hatırlamıyom :D
Thanks Mr.jeff
Thanks, this would have been nice before finals.
I am not getting Q at point C, how does the force acts on it??? I mean what is happening inside of the bar, how stress is aligned?
How about finding shear flow for a thin walled member? does it work for both?
I did not really understand that Q part. Should the area subjected to shear be the same which is that 4.5x1.5 rectangle?
No the area is different for both Q
if it has to be a symmetric plane, for Q_c, why doesn't it shear off vertically downward? is it because all of these equations have to do with reference to the neutral axis, so we can't cross it with our symmetric plane?
Professor would you have to calculate 2 different I values if the sides of the beam were not all symmetrical? Meaning would you have to calculate for Iy and Ix? Or do you just use Ix as you have in this video? Awesome content thanks!!
Mr Hanson I have an exam after tomorrow and I'm trying to reach my professor but he's too busy to give me 5 minutes to explain me the concept of the point of contraflexure in maximum shear and bending moment lesson would you please help me sir? you will really save me and my class
بشر؟
How does q build on this section. Does it start from zero at mid point and travel left and right of cross section. I don't see why there has to symmetry as you mention. I am missing the reasoning
Professor, in my class we learn that I=Summation[(bh^3)/12 + A'y'(bar)], yours is different. Just Summation[bh^3/12]; does it still work this way?? The y(bar) is different too, it is y(bar) = Summation[y(bar)(i)*A'(i)]/Summation[A'(i)]... i: each numbered section.
Hi, for the area in Q, arent we supposed to take the area that is affected by the nail? For example at point b, the area that is affected by the nail at b is the one below the nail.
Oh wait now i understand, thanks anyway!
doesn't matter which area you are taking (above or below). Both gives the same q value
how is the bottom the same? I did that the first try and got a number way later (64.125)
@@uygarsolmus2455 I think you are mistaken in this case.
Qc ผมจะเลือกพื้นที่ ฝั่งซ้ายของ รอยได้หรือไม่?
How come the centroid for point C is the same as point B? Shouldn't it be 3.375?
technically the centroid doesn't belong to one specific point, it is the average distribution of an area or volume. The centroid for the first section vs the second section doesn't shift vertically, but it does shift horizontally (but that doesn't matter in this problem)
it is probably the most confusing video in the Solids Course. Could anyone explain how to understand Qc part, plz?
I don’t understand how the Qc calculated. I thought the Qc = 0 since it has no area.
JH for prez