creep and shrinkage

[yaroosh]

Hello,

I am working on a bridge design where on one pile I have a creep and shrinkage of 500 kip and I want to know if this is a reasonable number. What I mean by a reasonable number, is there a standard of how much typically creep and shrinkage should be?

 

[bugbus]

I have a creep and shrinkage of 500 kip

This makes no sense

 

[phamENG]

creep and shrinkage

You keep using that word. I do not think it means what you think it means.

 

[Enable]

You keep using that word. I do not think it means what you think it means.

I've always stuck by this definition for shrinkage.

CWB (W47.1) Div 1 Fabricator
Temporary Works Design

https://www.enable-inc.com/

 

[phamENG]

Hey-o. Sounds like a personal problem to me, Enable.

Kidding aside - yaroosh....what are you talking about? Creep is the tendency of a material (typically concrete or wood) to deflect more over time when subjected to a long term load. Shrinkage is the reduction of volume of a material, typically due to either thermal or moisture reductions that cause it to, well, shrink. Shrinkage can cause stresses to develop in a material, and shrinkage is a cause for cracking in concrete, but it's not measured as a direct force. Creep is never measured as a force - at least not as far as I'm aware. So none of us know what you mean.

 

[Settingsun]

I believe this is the lateral force due to restraint of shrinkage and creep. The number looks big, but remember (message to Yaroosh) that we don't know anything about your bridge. Presumably it's typical but I don't know what's typical in your area. If it's 30m (100') pretensioned girders with expansion/contraction joints at reasonable spacing, I'd say there's a problem with the articulation - either the design of it, or the consideration of it in the analysis. Or it could be a long, integral bridge. No details means no answers, only speculation.