can anyone help me with applications of elasticity i read it but i cannot understand :(

Question

jamesj · Answer

As usual, it's best if you post a specific question.

aravindg · Answer

k

aravindg · Answer

why does girders have I shape

aravindg · Answer

|dw:1328280788687:dw|

aravindg · Answer

|dw:1328280788687:dw|

jamesj · Answer

To make them more rigid.  With this shape, it's harder for the girder to bend in either direction.

aravindg · Answer

can u relate it to elastic behaviour or sthng like that?

jamesj · Answer

yes: In both directions---x and y---there is with this design a greater thickness of material than there would be if the girder were not I-shaped.  As a consequence, the amount of force required to deform the girder is greater than it would be not I-shaped.

aravindg · Answer

why does pillars have below shape 
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aravindg · Answer

james srry bt i didnt get what u meant by the first one

jamesj · Answer

There are three types of column failure: 

This design helps minimize them.

aravindg · Answer

wel i hav an equation here can u xplain with that ??

aravindg · Answer

$$sagging=wl^3/4bd^3 Y$$

jamesj · Answer

Returning to the I-beams for the moment: the wikipedia article gets it right: "The horizontal elements of the "I" are flanges, while the vertical element is the web. The web resists shear forces while the flanges resist most of the bending moment experienced by the beam." http://en.wikipedia.org/wiki/I-beam

jamesj · Answer

I don't know this sagging equation.  Just think it through in your mind, or make a model out of cardboard.

Why does an I-shaped beam perform better than a beam that is just a vertical slab of metal?

aravindg · Answer

CAN U XPLAIN THAT THICKNESS PART Y IS IT MORE?

aravindg · Answer

do u mean that if thickness increases then bending decreases?

jamesj · Answer

Yes

aravindg · Answer

k i hav another interesting qn pls look at it

jamesj · Answer

Post it on the left.