Stress-Strain Curve for Prestressing Wire 1

[Psi1118]

Hello All,

I have been searching all over the internet for this information but to no avail. The PCI handbook 6th edition only has a stress-strain curve for 7-wire strand but not wires. Is there any place i can get a stress-strain curve for prestressed wire? I need it to find out my design strength capacity. Thanks!

 

[dhengr]

Wow... I really need a new pair of glasses. I sure shot a bull on that one, a 15.75" O.D. and 1.625" thick, who’da thunk it? I’m going to shuffle away now, with my tail between my legs.

 

[RobertHale]

The dp will be the radius of the section, since the centroid of the prestressing wires is coincident with the center of the section. d is undefined since it appears there is no mild reinforcing steel in the section. it wont really matter since the (omega - omega') will equal zero if there is not any mild reinforcing. The more accurate way is to use the stress-strain curve. It would be in appropriate to use a linear stress-strain relationship since the curve for the strand is not the typical bi-linear stress-strain curve we see in mild reinforcing. (Think cast iron as compared with A36). The best bet on the strand/wire curves would be to contact the manufacturer, and I have to assume any precaster worth a damn would be able to point you to the manufacturer or have the curves readily available. The manufacturers have to test and document the material and producing the curves should be a pretty ordinary request.

 

[IDS]

The best bet on the strand/wire curves would be to contact the manufacturer,

What is wrong with the yield stress and E value given in the code?

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[hokie66]

RobertHale is correct in that the yield point of high strength steel is not well defined. That is why rules have been developed to specify the stress to be used in design. This is usually expressed as the stress at a percentage of breaking load elongation.

 

[IDS]

RobertHale is correct in that the yield point of high strength steel is not well defined. That is why rules have been developed to specify the stress to be used in design. This is usually expressed as the stress at a percentage of breaking load elongation.

The numbers for which will be given in the design code.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[asixth]

Attached is a mill certificate for 7-wire strand I picked up along the way.