Point of Fixity

[Lutfi]

Can any one corroborate my definition of point of fixity in a driven pile? Is it the point at which the lateral deflection first reaches zero?

If anyone has a better or more elaborate definition, I would appreciate.

Thanks

 

[Focht3]

There are two different definitions, one dealing with the maximum moment and the other dealing with the point of zero rotation. Please explain your problem, and I'll offer what I know -



Please see FAQ731-376 by [blue]VPL[/blue] for tips on how to make the best use of Eng-Tips Fora.

 

[BigH]

Should we send him that discussion paper?

 

[Lutfi]

BigH,

Send the paper at this address LM_1959@hotmail.com

I just need a clear definition for lets say you have a steel or concrete pile. The pile is driven X feet into the ground, the pile extends Y feet above the ground and the pile top is supported. In computing maximum moments due to a lateral load imposed between top support and the ground. I would assume the proper way to compute moments is to use the length to the point of fixity.

Now, how do we determine the point of fixity if I do not have the services of a geotechnical engineer?

Thanks

 

[Focht3]

Do you have geotechnical data, or is this a preliminary design/WAG? Will a "rule of thumb" answer be good enough? Are we talking golf cart bridges, or multi-lane highway structures?



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