P DELTA Analysis of Pile Foundation
General
First order analysis assumes small deflection behavior; the resulting forces and moments take no account of the secondary effects due to the deformation of the structure under load.Second order analysis combines two effects to reach a solution: - 1st order analysis & large displacement analysis. The large deformation analysis takes full account of the effects due to the deformed shape of the structure and its members. When structures become more slender and less resistant to deformation, consideration of the 2nd order effects is a must.
P–Delta analysis
The objective of this article is to provide engineers with a short introduction of P-Delta analysis currently available in commercially software packages.P-Delta is a non-linear effect that occurs in every structure where elements are subject to axial load. P-Delta is actually only one of many second-order effects. It is a genuine “effect” that is associated with the magnitude of the applied axial load (P) and a displacement (delta).
There are two P-Delta effects:

- P-"BIG" delta (P-Ä) - a structure effect
- P-"little" delta (P-ä) - a member effect

This is a premium article available exclusively for our subscribers.
If you are already a subscriber, please Login
If not, subscribe now and get access to well researched articles & reports on infrastructure construction, equipment & machinery, innovations & technology, project reports, case studies, and more. All this by simply paying just ₹200/- for a month of complete portal access, or a discounted rate of ₹1000/- for a full year of access.
NBM&CW June 2010