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Allowable lateral deflection and load

 
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Sandhya Pai
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Joined: 01 Jun 2016
Posts: 7

PostPosted: Wed Jun 01, 2016 4:01 am    Post subject: Allowable lateral deflection and load Reply with quote

Sir,
As part of my M.Tech dissertation I was asked to find out the allowable lateral deflection and allowable pile capacity of piles in Soft clay. As of now im using Brom's method for finding the allowable load, But im not getting any method to find the lateral deflection.Is there any simple methods for calculating both. My soil stratum is multi-layered soft clay deposit. Kindly help me with the same.
Thanks in advance.
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Zia
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Joined: 28 May 2015
Posts: 33

PostPosted: Wed Jun 01, 2016 6:59 am    Post subject: Reply with quote

Hi,

You can use P-Y method to determine lateral deflection of piles under various loading conditions.  Refer to "Single Piles and Pile Groups Under Lateral Loading" written by Lymon C. Reese and William F. Van Impe.

Also have a look at "Piling Engineering" by Fleming, Weltman, Randolph and Elson.  They have described subgrade reaction and elastic continuum approach for piles in uniform soils.  These methods have also been extended to layered soils.

Please note that P-Y method will require software like LPile or RSPile.

Regards,
Zia
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Sandhya Pai
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PostPosted: Wed Jun 01, 2016 8:32 am    Post subject: Reply with quote

Zia wrote:
Hi,

You can use P-Y method to determine lateral deflection of piles under various loading conditions.  Refer to "Single Piles and Pile Groups Under Lateral Loading" written by Lymon C. Reese and William F. Van Impe.

Also have a look at "Piling Engineering" by Fleming, Weltman, Randolph and Elson.  They have described subgrade reaction and elastic continuum approach for piles in uniform soils.  These methods have also been extended to layered soils.

Please note that P-Y method will require software like LPile or RSPile.

Regards,
Zia



Sir,
Mine is a pile is multilayered soil deposits, and to model it I have used numerical analysis using Plaxis 3D and analytical methods like elastic approach and continuum analysis.I have also got comparable results. Now I need is to find allowable lateral deflection and pile capacity for this system. Sir im modelling with respect to a case study and I dont have experimental results so I cannot generate P-Y curve for that particular size. Is there any analytical way to get the allowable values. Thankyou for your quick reply.
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Dr. N. Subramanian
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PostPosted: Wed Jun 01, 2016 6:55 pm    Post subject: Reply with quote

Dear Er Sandhya

Reese method and Brom's method are the two methods usually employed. Please look into Tomlinson's book for more details of these methods. I think they can be used for multi layered soils too.

Best wishes
Subramanian


Sandhya Pai wrote:
Zia wrote:
Hi,

You can use P-Y method to determine lateral deflection of piles under various loading conditions.  Refer to "Single Piles and Pile Groups Under Lateral Loading" written by Lymon C. Reese and William F. Van Impe.

Also have a look at "Piling Engineering" by Fleming, Weltman, Randolph and Elson.  They have described subgrade reaction and elastic continuum approach for piles in uniform soils.  These methods have also been extended to layered soils.

Please note that P-Y method will require software like LPile or RSPile.

Regards,
Zia



Sir,
Mine is a pile is multilayered soil deposits, and to model it I have used numerical analysis using Plaxis 3D and analytical methods like elastic approach and continuum analysis.I have also got comparable results. Now I need is to find allowable lateral deflection and pile capacity for this system. Sir im modelling with respect to a case study and I dont have experimental results so I cannot generate P-Y curve for that particular size. Is there any analytical way to get the allowable values. Thankyou for your quick reply.
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Sandhya Pai
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Joined: 01 Jun 2016
Posts: 7

PostPosted: Thu Jun 02, 2016 6:25 pm    Post subject: Reply with quote

Sir,
Thankyou sir. I will continue the use of these methods.But cohesion value is to be considered and I'm confused about which cohesion value to be taken in multilayered soil deposits. I have now taken an average of the cohesion value of the two layers in the system. Is it the right way/??
Thankyou for the reply sir.
Regards,
Sandhya Pai
Dr. N. Subramanian wrote:
Dear Er Sandhya

Reese method and Brom's method are the two methods usually employed. Please look into Tomlinson's book for more details of these methods. I think they can be used for multi layered soils too.

Best wishes
Subramanian


Sandhya Pai wrote:
Zia wrote:
Hi,

You can use P-Y method to determine lateral deflection of piles under various loading conditions.  Refer to "Single Piles and Pile Groups Under Lateral Loading" written by Lymon C. Reese and William F. Van Impe.

Also have a look at "Piling Engineering" by Fleming, Weltman, Randolph and Elson.  They have described subgrade reaction and elastic continuum approach for piles in uniform soils.  These methods have also been extended to layered soils.

Please note that P-Y method will require software like LPile or RSPile.

Regards,
Zia



Sir,
Mine is a pile is multilayered soil deposits, and to model it I have used numerical analysis using Plaxis 3D and analytical methods like elastic approach and continuum analysis.I have also got comparable results. Now I need is to find allowable lateral deflection and pile capacity for this system. Sir im modelling with respect to a case study and I dont have experimental results so I cannot generate P-Y curve for that particular size. Is there any analytical way to get the allowable values. Thankyou for your quick reply.
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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Thu Jun 02, 2016 6:39 pm    Post subject: Reply with quote

Dear Er. Sandhya
I am out of station and will be back in my place only on 14th. Can you not use different values for different depths and integrate them. As I do not have any material here I am unable to give more accurate reply. Anyway you may give average value to get app. Results.
Best wishes
NS
Sandhya Pai wrote:
Sir,
Thankyou sir. I will continue the use of these mendhyathods.But cohesion value is to be considered and I'm confused about which cohesion value to be taken in multilayered soil deposits. I have now taken an average of the cohesion value of the two layers in the system. Is it the right way/??
Thankyou for the reply sir.
Regards,
Sandhya Pai
Dr. N. Subramanian wrote:
Dear Er Sandhya

Reese method and Brom's method are the two methods usually employed. Please look into Tomlinson's book for more details of these methods. I think they can be used for multi layered soils too.

Best wishes
Subramanian


Sandhya Pai wrote:
Zia wrote:
Hi,

You can use P-Y method to determine lateral deflection of piles under various loading conditions.  Refer to "Single Piles and Pile Groups Under Lateral Loading" written by Lymon C. Reese and William F. Van Impe.

Also have a look at "Piling Engineering" by Fleming, Weltman, Randolph and Elson.  They have described subgrade reaction and elastic continuum approach for piles in uniform soils.  These methods have also been extended to layered soils.

Please note that P-Y method will require software like LPile or RSPile.

Regards,
Zia



Sir,
Mine is a pile is multilayered soil deposits, and to model it I have used numerical analysis using Plaxis 3D and analytical methods like elastic approach and continuum analysis.I have also got comparable results. Now I need is to find allowable lateral deflection and pile capacity for this system. Sir im modelling with respect to a case study and I dont have experimental results so I cannot generate P-Y curve for that particular size. Is there any analytical way to get the allowable values. Thankyou for your quick reply.
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Sandhya Pai
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SEFI Member


Joined: 01 Jun 2016
Posts: 7

PostPosted: Fri Jun 03, 2016 3:14 am    Post subject: Reply with quote

Sir,
Thankyou very much sir. I will try.
Regards,
Sandhya Pai
Dr. N. Subramanian wrote:
Dear Er. Sandhya
I am out of station and will be back in my place only on 14th. Can you not use different values for different depths and integrate them. As I do not have any material here I am unable to give more accurate reply. Anyway you may give average value to get app. Results.
Best wishes
NS
Sandhya Pai wrote:
Sir,
Thankyou sir. I will continue the use of these mendhyathods.But cohesion value is to be considered and I'm confused about which cohesion value to be taken in multilayered soil deposits. I have now taken an average of the cohesion value of the two layers in the system. Is it the right way/??
Thankyou for the reply sir.
Regards,
Sandhya Pai
Dr. N. Subramanian wrote:
Dear Er Sandhya

Reese method and Brom's method are the two methods usually employed. Please look into Tomlinson's book for more details of these methods. I think they can be used for multi layered soils too.

Best wishes
Subramanian


Sandhya Pai wrote:
Zia wrote:
Hi,

You can use P-Y method to determine lateral deflection of piles under various loading conditions.  Refer to "Single Piles and Pile Groups Under Lateral Loading" written by Lymon C. Reese and William F. Van Impe.

Also have a look at "Piling Engineering" by Fleming, Weltman, Randolph and Elson.  They have described subgrade reaction and elastic continuum approach for piles in uniform soils.  These methods have also been extended to layered soils.

Please note that P-Y method will require software like LPile or RSPile.

Regards,
Zia



Sir,
Mine is a pile is multilayered soil deposits, and to model it I have used numerical analysis using Plaxis 3D and analytical methods like elastic approach and continuum analysis.I have also got comparable results. Now I need is to find allowable lateral deflection and pile capacity for this system. Sir im modelling with respect to a case study and I dont have experimental results so I cannot generate P-Y curve for that particular size. Is there any analytical way to get the allowable values. Thankyou for your quick reply.
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knsheth123
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Joined: 26 Jan 2003
Posts: 123

PostPosted: Fri Jun 03, 2016 1:58 pm    Post subject: Reply with quote

Dear Er. and Respected Subramanian Sir,

Pl. find the Analysis tool developed using EXcel-VB Macro for Laterally Loaded Piles.

It calculates capacity by Reeese method of p-y curves - Linear Analysis for Multi layer soils (Max. 7 Layers).

For ease of using it, the background theoretical part and sample problems are also attached.

Always use GL as 0.00m, i.e. for unsupported length above G.L. start with -ve value.
A 10m long pile with 2m unsupported length shall be treated as start of pile -2.00m and Tip of Pile +8.00m

The same can be extended for calculation of displacement for given lateral load/moment at top.


K. N. Sheth
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Dr. N. Subramanian
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Joined: 21 Feb 2008
Posts: 5289
Location: Gaithersburg, MD, U.S.A.

PostPosted: Fri Jun 03, 2016 7:23 pm    Post subject: Reply with quote

Dear Prof. Sheth

Thank you very much. But you forgot to attach the Excel sheet, I think. Please send it to my email ID.

Thanks again & Warm regards
Subramanian




knsheth123 wrote:
Dear Er. and Respected Subramanian Sir,

Pl. find the Analysis tool developed using EXcel-VB Macro for Laterally Loaded Piles.

It calculates capacity by Reeese method of p-y curves - Linear Analysis for Multi layer soils (Max. 7 Layers).

For ease of using it, the background theoretical part and sample problems are also attached.

Always use GL as 0.00m, i.e. for unsupported length above G.L. start with -ve value.
A 10m long pile with 2m unsupported length shall be treated as start of pile -2.00m and Tip of Pile +8.00m

The same can be extended for calculation of displacement for given lateral load/moment at top.


K. N. Sheth
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knsheth123
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Joined: 26 Jan 2003
Posts: 123

PostPosted: Sun Jun 05, 2016 5:20 am    Post subject: Reply with quote

Dear Er. and Respected Subramanian Sir,



I had attached two file thro' the SEFI reply proforma but is not found in the circulated mail. Attached again
Regret for inconvenience.
K. N. Sheth
Guidelines given in preceding mail:
Analysis tool developed using EXcel-VB Macro for Laterally Loaded Piles.

It calculates capacity by Reese method of p-y curves - Linear Analysis for Multi layer soils (Max. 7 Layers).

For ease of using it, the background theoretical part and sample problems are also attached.

Always use GL as 0.00m, i.e. for unsupported length above G.L. start with -ve value.
A 10m long pile with 2m unsupported length shall be treated as start of pile -2.00m and Tip of Pile +8.00m

The same can be extended for calculation of displacement for given lateral load/moment at top.
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