Base Plate and Anchor Rod Design Introduction

This is an introductory video on base plate and anchor rod design from a mechanical engineering point of view. Mechanical engineering fundamentals are applied, while avoiding more complicated analysis methods. Model simplifications are made using simple a cantilever beam analogy and sizing of anchor rods will be based off the tipping condition. Excel analysis will be completed in next video
3:40 Sizing Base Plate Area/Bearing Strength of Concrete
6:19 Sizing thickness of base plate/ yield strength of base plate
14:19 Anchor Rod design/Sizing fasteners

[@SouvikCivil]

BEST EXPLANTION OF ALL! Thank you. I watched many other videos before yours but this one truly is the best explained

[@kanankeban]

Excellent Explanation....just what i was looking for! Thank you so much!

[@Anghel57190]

Thanks a bunch!

[@hichemhassaine8376]

Thank you for that compelling explanation.

[@jackyeh7512]

At <a href="#" class="seekto" data-time="264">4:24</a>, the bending stress diagram for the drypack (concrete) under the base plate is questionable. There is no tension between the base plate and the drypack (concrete) except the anchor bolt tension force. The total stress diagram is also questionable. Usually it is assumed that the compression due to over-turning moment (OTM) is uniformly distributed under the base plate beyond the column flange at one side and the tension is resisted by the anchor bolts at the other side. Additional compresion due to column axial load is added to the compression due to OTM for base plate thickness design. There is no need to over analyze the stress distribution. For daily design, the anchor bolt and base plate design guide published by AISC should be used. A single equation can determine the required base plate thickness.

[@vikashdhamala4655]

At <a href="#" class="seekto" data-time="340">5:40</a>, did you mean the dimension N as thickness of concrete or width? bh3/12 holds true only if h is the thickness of concrete.

[@zainsaeed4548]

i also thing he took the depth of concrete block as N and width (viewable in elevation ) as B

[@alperturna4371]

While Converting stresses into distributed loads, there is a mistake I think. Although you use 1" strip to simplify, it really does not matter. We still have "t" which is the thickness of the base plate. And it was not considered while calculating the line loads.

[@zainsaeed4548]

It looks that B and N are plan dimensions of plate or concrete. However, when calculating the Moment of inertia is I = BH3/12 ...this means here you took H (thickness of concrete block) as N. Also, while calculating bending stress (Bending stress =My/I) (at <a href="#" class="seekto" data-time="339">5:39</a>/10.05 in the video) why are we considering y = N/ 2 and ..i thought may be the y should be half the depth of concrete block provided under the base plate. Please elaborate the N and B.. is it plan dimensions for base plate or dimension in elevation view for concrete block

[@deepakjohsh7748]

Please think in terms of which face is fixed. here the square face (formed by sides B and N) is fixed, for us to have Bt3/12, the rectangular face (formed by sides B and t) must be fixed

[@mitzaBeatz]

@@deepakjohsh7748 Yeah. He is calculating the pressures on the BxN face at that point, the same you do when you calculate the pressure distribution at the bottom of a pad footing while interacting with the soil.

[@akhilasivan8305]

i would like to know the case if a base plate will have a case of moment =0....pls can u explain about that.......

[@undhinesh]

Hi, which euro code is used to design anchor bolt with base plate in concrete footing.../

[@deepakjohsh7748]

Eurocode 4 : Design of Composite Steel and Concrete Structures

[@emadnadi152]

How about the weld design between the column and the baseplate ????

[@marcolivierbien-aime1944]

Thank you so much for this video. I've got a quick question, is there a conservative way to design a base plate on the action of a biaxial moment ? Or Do I have to a go with a " Matrix analysis " ? Maybe I can simply choose the enhanced moment for the design. Best regards!

[@isabeladiadamiperez1617]

THANK YOU! :)

[@NaveenKumar-yy9ze]

Awesome video !! This is the video am really looking for . I have one question here how will the design change if we add a stiffner in base plate . Can you explain ??

[@gregtrainorr]

Hey Naveen. Introducing stiffeners will reduce the bending moment in the plate. Say you installed stiffeners aligned with the sides of the column flanges and extended these across the baseplate's full length. The moment developed in the plate due to the bolts/compressive block acting at a distance - previously - from the column flange would then be governed by the distance to the stiffener plate. Think of it this way - the load will distribute to the nearest and stiffest part, which would then become the stiffener plate. The governing distance for developing the moment, also known as the lever arm (termed 'z') would then reduce. Therefore, so would the moment [where Moment (M) = Force (F) x Lever Arm (z)]. Hope this helps you in some way.

[@brandanlarson4942]

Hey @TopDogEngineer at around <a href="#" class="seekto" data-time="600">10:00</a> we're using qb1 and qb2, but I'm a little confused on x_1, x_end, and I. Are x_1 and x_end measured from the neutral axis, the fixed end of the cantilever, or other? Is the moment of inertia (I) the same for qb1 and qb2? Awesome video. Really helps, thanks!

[@sundaresanmurali7949]

Thanks sir india

[@georgemacharia2394]

Great

[@ebrahimhamdialsofi3911]

Thanks

[@goodmind6446]

i m in imagination regarding I = BN3/12 why not t3 , t= thickness of plate

[@deepakjohsh7748]

it should be BN3/12 and not t3, this is decided based on which face is fixed/rested. here the square face (formed by sides B and N) is fixed, for us to have Bt3/12, the rectangular face (formed by sides B and t) must be fixed