Secondary analysis for Pile foundation by P-Δ method
International Journal of Applied Engineering Research ISSN 0973-4562 Volume 11, Number 3 (2016) pp 1579-1582© Research India Publications. http://www.ripublication.com1579
Secondary analysis for Pile foundation by P-Δ
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-∆) - a structure effect
- P-"small" delta (P-d) - a member effect
Abstract:This research investigates the influence of gravity loads and large displacements theory, generally known as second order P-delta effects, on the stability of reinforced concrete (RCC)bridge piers. Second order analysis combines two effects to reach a solution of 1st order analysis and large displacement analysis. The large deformation analysis takes full account of the effect due to the deformed shape of the structure and its member. When structures become more slender and less resistant to deformation, consideration of 2nd order effects is essential for tall members. Most of the methods are available for analysing slender exposed piles subjected to axial thrust,sway and lateral forces, are at best in terms of theoretical methods only. So in this paper, an attempt is made to study the secondary analysis of the pile foundation. The results 2nd order effect by manual calculation are compared with modelling (Midas Civil software) results.Keywords: Column, P-delta analysis, Pile foundation.
-Vinayagamoorthy.M
why secondary analysis of pile is important?
ReplyDeleteDelta effect also known as geometric nonliterary involves the equilibrium stability relationship of a structural system loaded about its deflected configuration. P-delta effect typically involves large external force upon relatively the displacement. Due to soil force which is acting laterally to the pile, the force cause the delta effect for pile foundation also which induce (if the delta value is high) the geometric nonliterary to the structure effect the stability.
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