It depends on my caps whether I use strut and tie or conventional beam theory. The vast majority, I use conventional beam theory, but I just had a project where I designed around 20 pier caps with strut and tie; they supported columns, so it was shear that controlled and there were concentrated loads. The design of these pile caps will be pile cap design using beam theory Jul 30, 2019 For pile cap design, two methods are commonly used: design using beam theory or design using strut and tie method. In the first case, the pile cap is handled as an inverted beam and designed like a beam for bending and shear.
Truss theory design can be done using Table 194 of Reynoulds hand book. Beam theory: When (av d) ratio is more than 2 as in shallow pile cap or with the arrangement of 6 or more piles, bending action is more predominant than truss action. In this case the pile cap is designed as a normal beam for bending moment and shear. pile cap design using beam theory
Structural Design of Pile Caps Using Strut and Tie Model (EC 2) by. Ubani Obinna Ranks on. 11: 2004 permits us to use strut and tie models to analyse structures where nonlinear strain distribution exists (e. g. pile caps, deep beams and corbels). In strut and tie models, trusses are used with the following components: Struts (concrete) A fourpile group supports a 500 mm square column which carries a factored load of 2800 kN. The piles are 450 mm in diameter and spaced at 1350 mm centres. Eurocode Standards Design of Buildings Eurocode. Pilecap design example using truss analogy. Last Updated on Wed Pile Cap Truss Analogy Concrete Design; Design example on a pile You design the caps for the capacity of the piles. If you have 50 ton piles and a 6 pile group, you will design the cap to resist the full 300 tons (600k in the US). If you have a cap that had 525kips you will just select the 6 pile cap and move on. I once had a job with pile caps where the owner wanted the ultimate economy in the design. pile cap design using beam theory same method can use to calculate the moment in the pile cap. In beam theory analysis the two axial direction need to be considered which is in direction of x and y axis. Beam Theory for Pile Cap with Five Piles: X and y direction must be considered in analyzing for pile cap with five piles. Reinforced Concrete Design Design of pile cap General Pile layout pattern: Pile under pile cap should be layout symmetrically in both directions. The column or wall on pile cap should be centered at the geometric center of the pile cap in order to transferred load evenly to each pile. Example of pile layout pattern are shown below: For long pile caps, distribution of longitudinal flexural stresses is more or less linear and closely responds to the simple beam theory Deep Beam behavior is not significant for flexural computations in the longitudinal direction Design of Pilecaps ACECOMS, AIT Actually no particular theory or method is perfect for pile cap design. Strut& Tie Model (STM) is more reliable to design a pile cap; considering the pile cap as a deep beam. But in STM approach punching shear cannot be checked directly. Column size may be different in many cases but the punching shear value cannot be separated from STM approach.