hand checks

[Nedian]

hI raxitpatel !

Can you please attach your excel sheet for calculating base reaction on the basis of tributary area method.

Thanks in advance.

Regards,
Nedian

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[repsol]

Hey guys,

Im trying to perform a hand check for the design of the column..Software used is STAAD for analysis.At one location,Column level is as follows,
1)foundation to tie beam(about 1.6 m high).Fy=10 kN(I ASSUMED THIS IS THE AXIAL LOAD ACTING)
2)Tie beam level to 2nd floor ,Fy=23 KN
3)2nd floor to roof level..FY=14KN..
A TOTAL OF 10+23+14=47 KN..but the reaction(R = around 300kn) to the support doesnt add up to those of column axial load..

Can somebody clarify this?,,and does Fy = to axial load or should be the reaction coming from the beam that this column supposed to be supporting..someone pls enligthened me...thanks in advance

[roamer86]

i want to know, how we calculate length of shear wall required for a building? what formulas involved? im using British Standard. Thank you

At very preliminary stage, if a 3D software is not used, an average shear stress of wall to be 2~3MPa should be conservative. Based on this, you can guess how much shear wall area you need.

The other way os to use a ratio 1%~3% of total building area.

I prefer the 1st one, which gives more physical insight. However, many a time, a quick model may serve many purposes.

Handcheck analysis: Force balance at various sections under grav. load and lat. load cases. Such exercise will not only ensure the correctiness of your model, but also provides lots of insight of struct behaviors. Always starting from simple, where you can easily tell if results are right or not.