Pile foundation design example

Pile foundations Pile foundations are the part of a structure used to carry and transfer the load of the structure to the bearing ground located at some depth below ground surface. The main components of the foundation are the pile cap and the piles. Examples of pile capacity computations are presented in Appendix D. In this manual, a pile foundation will be broadly described as one in which the following is true of the piles : (1) Piles are driven, not drilled.

Standard commercial, not special patent, piles are used.

Instructional Materials Complementing FEMA P-75 Design Examples Foundation Design - 3. Load Path and Transfer of Seismic Forces. Force on a pile EQ on unloaded pile Pile supporting structure. Unmoving soil EQ Motion. This design example is for timber piles that are driven in non-cohesive soil using the Iowa DOT ENR Formula for construction control. Pile Supported Foundation ( Pile Cap ) Analysis and Design Based on a geotechnical study, a pile supported foundation is required to support a heavily loaded building column.

Design the pile cap shown in the following figure with in.

Footings proportioned for gravity loads alone. Determine point bearing capacity of a pile. Pile Analysis , Design and Detailing. For this design example , it is assumed that all piles will be fixed-hea 22-inch- diameter, cast-in-place piles arranged in 2×pile groups with piles spaced at inches center-to-center.

Factor Loads for Each Combination. What does pile foundation mean? Verify Need for a Pile Foundation. Between the geotechnical design parameters of bearing capacity and settlement, which are independent, if the design just satisfies bearing capacity, settlement will be over satisfied (i.e. settlement less than permissible), and vice versa, if the design satisfies settlement, bearing capacity will be over satisfied (i.e. factor of safety against bearing capacity failure higher than the minimum required value).

Allowable Pile Capacity is the minimum of : 1) Allowable Structural Capacity 2) Allowable Geotechnical Capacity a. Negative Skin Friction b. LRFD Steel Girder SuperStructure Design Example Pile Foundation Design Example Design Step P Table of Contents Design Step P. Define Subsurface Conditions and Any Geometric Constraints Design Step P. The ultimate load on a pile is the load that can cause failure of either the pile or the soil. The pile failure condition may govern design where pile points pene- trate dense sand or rock, but in most situations, ultimate load is determined by the soil failure. Scope This chapter deals with the geotechnical design of spread foundations according to Eurocode 7.

Section of Eurocode Part presents the different aspects to be considered for designing shallow foundations of buildings, bridges, walls, isolated columns etc. Static pile design The piles are required to be designed according the provisions of EC7. The design of a piled raft foundation requires an assessment of a number of geotechnical and performance parameters, including: (a) raft bearing capacity (b) pile capacity (c) soil modulus for raft stiffness assessment (d) soil modulus for pile stiffness. The number and location of the piles are very important to calculate the pile forces.

The pile cap must be designed for the resulting shears and moments in both directions. When designed by hand the whole process may be time consuming. The analysis and design of shallow foundations is not discussed in this manual. Deep foundations distribute loads to deeper, more competent soils or to rock, by means of skin-friction, end bearing, or a combination of both.

This manual is devoted to the discussion of the structural and geotechnical aspects of timber pile foundation design. Chapter covers foundation design for marine structures. Vertical loads on these piles are derived from dead load of the structure, dynamic forces from traffic, and downdrag.

D The proposed foundation for the home is a system of steel pipe piles, a reinforced concrete grade beam, and concrete columns extending from the grade beam to the elevated structure.