design of special staircase 1

[lesgiu]

Hi guys, any of you have an idea of designing a staircase like the one shown in this website (the last one - ortopoligonales)?

http://www.ip-3.com/escaleras.htm

i have many doubts about the reinforcement, does it work? please if u have any detail please send it to me.
thanks a lot

 

[csd72]

This will deflect loke nothing else. To model it for deflection you will need to model it as a multiple cranked beam (with each step consisting of a vertical and a horizontal member). Bending moment will be the same as any other stair of the same length.

Reinforcement needs to be designed to first principles with bars small enought to develop a hooked bar across the width of the riser. Bottim bars will be shaped like an upside down W with the ends being hook at the concrete cover at the top face. Bottom bars will be similar but upside down.

 

[lesgiu]

Thanks csd72. But my english is not so good, please do you have any detail or image about the reinforcement coz i cannot understand it so well. Thanks again.

 

[dik]

I did the staircase in the Cornwall Centre in Regina, Saskatchewan, Canada... sort of like the first, except there was a 'gap' between the stairway from the landing up and down... took me over two weeks to analyze and design... before widespread use of computers...

Dik