How do you calculate pile eccentricity?
How do you calculate pile eccentricity?
For the 3 pile group example, if say all piles deviate in the X direction by +75 mm and in the Y direction by +75 mm, therefore the net pile group eccentricity would be 75×3 = +225 mm in both directions.
What is eccentricity in pile cap?
INTRODUCTION – One type of failure for piled foundation is eccentricity. – Pile eccentricity happens when there is short comings of driving pre-designated piles at exactly correct position on the ground. – The deviation of these piles may jeopardize the integrity of pile cap.
How do you size a pile cap?
2. Recommended Thickness of Pile Cap
- If diameter of pile < 550mm: thickness = 2 x diameter of pile.
- If diameter of pile > 550mm: thickness = 1/3[(8 x diameter of pile)-600]
How do you make a pile cap for a single pile?
IMHO, for a single pile pilecap, the size is fixed based on pile size and column size (6″ on all sides from pile and 2″ on all sides from column – whichever is more critical). The depth of the pilecap is determined by required anchorage length for column bars and pile bars.
How do you make pile caps?
Pile caps can be designed using the truss analogy or using the bending theories. Mostly, up to the four numbers of piles are connected by a pile cap to support the concentrated load from the superstructure, truss theory is used to design the pile caps.
What is pile deviation?
The deviations of pile foundations (precast piles), which is defined as the lateral displacement of the pile head, were collected from as-built drawing documents that were prepared after the piling activity at each project has completed.
What is eccentricity simple?
Definition of eccentricity 1a : the quality or state of being eccentric. b : deviation from an established pattern or norm especially : odd or whimsical behavior.
What is pile cap in construction?
A pile cap is a thick concrete mat that rests on concrete or timber piles that have been driven into soft or unstable ground to provide a suitable stable foundation. The cast concrete pile cap distributes the load of the building into the piles.
Is code for under reamed piles?
Indian Standard IS 2911 (Part III) – 1980 covers the design and construction of under reamed piles having one or more bulbs. According to the code the diameter of under reamed bulbs may vary from 2 to 3 times the stem diameter depending upon the feasibility of construction and design requirements.
Is there Eccentricity analysis of pile cap system for two columns?
This paper presents program undertakes the eccentricity analysis of pile cap system for two columns combined pile cap under assumption of axial and piles working load. The program is developed by using Microsoft Excel Spreadsheet which eccentricity for certain amount of loading and procedure for additional pile.
What is the maximum allowable eccentricity value for a single pile?
Results of this study indicates that the norm of adopting a maximum allowable eccentricity value of 75 mm for each individual pile irrespective of pile size, pile working load, pile spacing & column loads is quite misleading and may result in an unsafe pile group performance!
How do you develop a pile cap analysis program?
The program is developed by using Microsoft Excel Spreadsheet which involved three phases; analyse combined pile cap subjected to zero and non-zero eccentricity, establish chart for maximum allowable eccentricity for certain amount of loading and procedure for additional pile.
What is the critical factor in determining eccentricity of pile groups?
Rather, results from this study suggests that the critical factor is not the eccentricity of individual piles but the overall net pile group eccentricity. This causes eccentric moments to act in the pile group which in turn governs the redistributed load to each individual pile within the pile group.
