Tilt-up panels for progressive collapse resistance

[strucguy]

Anyone here involved in a multi-story tilt project designed to resist progressive collapse? I am not sure if it is practical to make the walls do all the job (bearing, lateral, bending, progressive collapse) for me. Please share your experiences or ideas. Thanks in advance.

 

[mijowe]

Are you required to use tie-force or Alterante Path?

 

[strucguy]

Just the alternate path.

 

[mijowe]

I am guessing that getting progressive collapse to work with a structural system like tilt-up is going to be a challenge if you have to satisfy the alternate path method. What is your floor system?

 

[strucguy]

That's what I thought. But, our contractor thinks otherwise. He is of the opinion that there would be significant savings by not having all those expensive steel moment frames at the perimeter by making the panels do all the work for you. But, I am not so sure about that.

The floor system is concrete over metal deck spanning between steel beams.

 

[mijowe]

For the UFC tie force method all construction types are in play, I could easily justify tilt-up and slab on deck. They even have examples for wood frame construction.

When you actually have to prove that it works with calculations, like with the UFC Alternate path, CIP concrete or steel moment frames seem to be the only practical way to go. It may be possible, but any savings that he thinks he will get will probably go away with all the special detailing you would need to get it to work.

 

[csd72]

I disagree that it is necessarily going to be difficult.

As long as you have an alternative load path then panels can easily be made to act as a beam. 2 panels can span as a beam across the gap from the 2 below if they are held in plane and have a top and bottom connection between them that can take the push/pull of the moment.

Depends on your layout exactly how you would achieve it.

Alternatively you could look at a hybrid system.

 

[strucguy]

Thanks for your responses. I sure do know that you can make the tilt panel work in resisting progressive collpase. But, my only concern is whether the option would prove to be any economical.