A. INTRODUCTION – MODEL DATA
In this document we will examine the influence of the P-Δ effect in helical piles. Analysis of piles in accordance with the assumption of small deformation is not always a valid one. For flexible piles where significant lateral deflection is expected, second-order effects could lead to an incorrect calculation of moments and subsequently design of the piles. Specifically, the additional moment contributed from the Axial load along the pile multiplied with the lateral pile deflection, is not considered in small deformation analysis (Fig. 1). As a result, for such scenarios the use of the P-Delta effect option within DeepFND is essential.
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_12d182974fc6471f9d477678bf0c8cd3~mv2.png/v1/fill/w_80,h_42,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_12d182974fc6471f9d477678bf0c8cd3~mv2.png)
B. DEEPFND SOFTWARE – SOIL PROPERTIES & STRATIGRAPHY – DM EDIT
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_494c5a338dc0404e9f50d5d5a26a0985~mv2.png/v1/fill/w_80,h_23,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_494c5a338dc0404e9f50d5d5a26a0985~mv2.png)
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_dcf49447d7e846b2964114a24b78611a~mv2.png/v1/fill/w_80,h_54,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_dcf49447d7e846b2964114a24b78611a~mv2.png)
C. DEEPFND/HELIXPILE SOFTWARE – PILE SECTION PROPERTIES
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_50ad56e734c24ad6bf9838d4f45104fd~mv2.png/v1/fill/w_80,h_9,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_50ad56e734c24ad6bf9838d4f45104fd~mv2.png)
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_7d90261d11c04c01ad544c7a42b9c7a9~mv2.png/v1/fill/w_80,h_60,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_7d90261d11c04c01ad544c7a42b9c7a9~mv2.png)
D. DEEPFND/HELIXPILE SOFTWARE – ANALYSIS SETTINGS
1. Bearing Capacity Method: Meyerhoff/Hansen
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_fed81a8c58fc482d995bf263dbeb95de~mv2.png/v1/fill/w_80,h_13,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_fed81a8c58fc482d995bf263dbeb95de~mv2.png)
2. Installation Torque: AC358-2007 Torque Factor Profile
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_a75c8531a01e4b68aceb0e27e52ea12b~mv2.png/v1/fill/w_80,h_11,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_a75c8531a01e4b68aceb0e27e52ea12b~mv2.png)
3. P-DELTA: Check the model with and without the P-DELTA Effects
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_58db3a15d7004a6886812fcfe8cf777c~mv2.png/v1/fill/w_80,h_48,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_58db3a15d7004a6886812fcfe8cf777c~mv2.png)
E. DEEPFND/HELIXPILE SOFTWARE – ANALYSIS RESULTS
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_319e7e238bdb499a95b2ab5c47019562~mv2.png/v1/fill/w_80,h_37,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_319e7e238bdb499a95b2ab5c47019562~mv2.png)
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_53f953fdce9b4e0fb6f630a0447622d8~mv2.png/v1/fill/w_80,h_36,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_53f953fdce9b4e0fb6f630a0447622d8~mv2.png)
![P-Delta Effects on a Helical Pile](https://static.wixstatic.com/media/b53ca0_447ade94dcdc42168f82539b000b6110~mv2.png/v1/fill/w_80,h_41,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/b53ca0_447ade94dcdc42168f82539b000b6110~mv2.png)
![](https://static.wixstatic.com/media/d323f9_5701722f210841debd2d3be5566a5e4f~mv2.png/v1/fill/w_62,h_43,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/d323f9_5701722f210841debd2d3be5566a5e4f~mv2.png)
Design Foundation Pile Systems in Minutes!