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 Topic: Geotechnical design and analysis Subject: Shear force along the base of a cap under H
 Author: Francesco 2001-08-05 I am analysing a 6-pile group under lateral loading and would like to include the contribution due to the base interface friction resistance of the cap (if we exclude any contribution from the cap base interface friction, the calculated pile group deflection is about 35mm under a lateral load of 11000kN). Since the bottom of the cap was cast in place on a sandy surface (with a friction angle of 30deg), as a first approximation, I have estimated the resistance contributed by base friction (Fb) as W*tan(delta), where W is the weight of the cap and delta is the friction angle between the concrete and the soil. The reinforced concrete cap is 12m (length), 8.4m (width), 2.1m (height). If delta is taken as 25deg, this would give a maximum frictional force (Fb) of about 2400kN.I would like to get some comments or input on how to calculate the load-displacement curve associated with the development of interface friction on the sandy surface and, in particular, the amount of lateral movement needed to fully develop the maximum frictional force of 2400kN.Many thanks,Francesco Reply to this posting
Follow-up:
 Author: Tom Sklucki 2001-09-21 If there is anyone out there who's been asleep for a couple of years, be advised that the posting from Nigeria in reply to this subject is an example of a well known confidence trick. This sort of message has been sent out, with minor variations in style, by post, fax, or email from Nigeria to various businesses. Sounds too good to be true and of course, it is. Many people have lost money to these criminals. It has been reported that some people have been lured out to Nigeria with 'enabling' money and been assaulted or murdered in the course of being robbed.