hollow core slabs-modelling 1

[nivanka]

Is there any to give me an advice what is the best way to model hollow core slab (prestressed) in Nisa? It must be in 3D. How to enter a prestressed tendon, is it a cable or something else? Thanks!

 

[damiller]

There are several software programs out there that can design prestressed members. One that comes to mind is LECPres Precast Prestressed Beam Design by Losch Engineering Corporation. To design hollow core you have to make sure you input the correct section properties, which is usually listed in a hollow core producer's design manual for a particular size plank. Of course, you must be a design professional or experienced with the software to be sure you are doing it right and understand what you are inputing and outputing.

 

[astructurale]

I don't know about Nisa. Never heard of it, but I am familiar with hollowcore. Typically the manufacturer will have load tables thatyou can use to pick a cross section size and even the strand configuration. The LECPres program is one that you can use, and there are several others: J&A Beam, Presto, Concise.

I work for a manufacturer that produces hollowcore. If you can give me more specifics I can steer you in the right direction if it is just sizing that you need, although the loading capacitys can vary some based on the cross-section. The Precast Prestressed Concrete Insitite (PCI) Handbook also has some standard load table to give you a starting point.

Typically the hollowcore producer will do the design calcuations, so you don't need to do it.