Shaer connector design

shalini...@gmail.com

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Apr 21, 2008, 5:52:03 AM4/21/08

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I have a composite column and I need to design shear connectors from
the consideration of longitudinal shear due to variation of bending
moments between 2 sections (flexural shear)

What I have done is:

1. I check the shear force at various sections of column following
the
structural analysis.
2. Out of these I get the maximum shear force
3. I calculate the design shear stress from this using the shear
stress formula that is;
4.Now I have the value of shear strength for that section of column I
am using.
5. I calculate the shear force to be resisted by connectors using the
diffreence between 3 and 4.
6. I have the value of the resistance of a single connector.
7. I thus calculate the number of connectors.

MY QUESTION IS:
1. How do I get the spacing of these connectors over the column
member?
2. Should I space it unioformly?
3. Then, if for optimisation, I calculate the maximum shear force at
segments from "0" to "0.5L" and "0.5L"to "L", then how to space
these
connectors at these 2 segments?

Kannan

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Apr 22, 2008, 9:03:20 AM4/22/08

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Is it a concrete column with steel casing?
Why didnt consider the longitudinal shear stress due to axial force?
What are the support conditions?

shalini...@gmail.com

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Apr 22, 2008, 11:33:54 AM4/22/08

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Yes it is concrete column with steel casing?---I worked as it was in
Explanatory handbook to the code (Euro code)---but need clarifications
on spacing??

Kannan

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Apr 23, 2008, 9:39:55 AM4/23/08

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Ok, since there no relative motion between the two materials there
wont be any longitudinal shear stress st the interface due to axial
load.

Since we know the shear force at various sections of column following
the structural analysis, divide the column into few zones. Within each
zone design for the maximum shear force.

It is common to provide Studs in square grid. consider a square meter
interface and consider 9, 16 or 25 studs and see which one satisfies.

shalini...@gmail.com

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Apr 23, 2008, 12:22:26 PM4/23/08

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I divided the column into 3 zones.Each zone of length L/3 ("L" being
the total length of the column)--i am basically writing a design
program.

Now, if the shear over the whole length of column is constant then
each of my 3 zones will require same no of shear connectors.Right?Let
us say each zone requires "N" connectors

Now do you want me to space "N" connectors in each zone?

Rather if do not divide into 3 zones and consider only "1" zone then
too i get same number of connectors.Right?

In that case it will be economical to have only one zone instead of
three?

Right?

Kannan

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Apr 23, 2008, 7:01:35 PM4/23/08

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Your 3 zones will have same number only when the shear stress are the
same in each zones. But the shear stress at the mid span will be
lesser compared endspans. You will provide lesser at mid span.

Kannan

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Apr 23, 2008, 7:03:42 PM4/23/08

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On Apr 24, 12:22 am, shalini.sing...@gmail.com wrote:

If the shear over the length is same you do not need to divide zones
in the first place. Just distribute the studs same over the whole
length.