www.sefindia.org

STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

 Forum SubscriptionsSubscriptions DigestDigest Preferences   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups  RegisterRegister FAQSecurity Tips FAQDonate
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log in to websiteLog in to websiteLog in to websiteLog in to forum 
Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.

Pile and Pile cap design

 
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion
View previous topic :: View next topic  
Author Message
Dr. N. Subramanian
General Sponsor
General Sponsor


Joined: 21 Feb 2008
Posts: 5520
Location: Gaithersburg, MD, U.S.A.

PostPosted: Mon Nov 28, 2022 4:10 pm    Post subject: Pile and Pile cap design Reply with quote

A note I wrote about pile and pile cap design I wrote today in response to a question in a group:
Pile design is simple as it is designed as a short column, unless there is a poor soil surrounding it. In some old books, the piles are designed as long columns, which is expensive.

Pile cap is designed as a flexural member in many books, which again is not actually represent the behaviour of pile cap. As the usual depth of pile cap will be large, the bending theory is not applicable and hence it has to be designed by strut-and-tie method, which was made popular by the late Prof. Schlaich of the University of Stuttgart, Germany in the 1990s. ACI 318-19 has provisions for this method. There is a classical paper by Prof. Schlaich and his associates in the PCI journal.

All the above is with respect to structural design. Piles also should be checked as per soil design.

Another area which is still not clear is the group effect. We consider that the piles in a group share the load equally, which may not be correct.

One more thing regarding detailing of pile caps. In flexural design, the rebars are placed uniformly in the pile cap. If you design as per strut-and-tie method, only the strips connecting the piles are reinforced for the designed tension. Other areas may be provided with nominal reinforcement.  

In addition to the designed reinforcement, some bursting reinforcement is recommended by codes.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topicReply to topic Thank Post    www.sefindia.org Forum Index -> SEFI General Discussion All times are GMT
Page 1 of 1

 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


© 2003, 2008 SEFINDIA, Indian Domain Registration
Publishing or acceptance of an advertisement is neither a guarantee nor endorsement of the advertiser's product or service. advertisement policy