Chapter 10 Single Piles Static Capacity and Lateral Loads;Pile/Pole Buckling
Chapter 10 Single Piles Static Capacity and Lateral Loads;Pile/Pole Buckling
10.1 Introduction What's piles-Piles are structual members of timber, concrete,and/or steel that are used to transmit surface loads to lower levels in the soil mass. How pile transmit loads-by skin (or side)friction (resistance)and point (or end)resistance. Skin (or side)friction (resistance)-vertical distribution of the load along the pile shaft Point (or end)resistance-direct application of load to a lower stratum throught the pile point
10.1 Introduction ◼ What’s piles-Piles are structual members of timber, concrete, and/or steel that are used to transmit surface loads to lower levels in the soil mass. ◼ How pile transmit loads-by skin (or side) friction (resistance) and point (or end) resistance. ◼ Skin (or side) friction (resistance)-vertical distribution of the load along the pile shaft ◼ Point (or end) resistance-direct application of load to a lower stratum throught the pile point
10.1 Introduction Piles may be classified based on: the load transmit-friction (or floating)pile and point, or end-bearing pile. The material of pile-concrete pile,timber pile,steel pile and composite pile The installation of pile-precast concrete pile,cast-in- place concrete pile and prestress concrete pile The inserted method of pile-driving with blows, driving using a vibratory device,jacking and drilling a hole and inserting a pile into it
10.1 Introduction ◼ Piles may be classified based on: ◼ the load transmit-friction (or floating) pile and point, or end-bearing pile. ◼ The material of pile-concrete pile, timber pile, steel pile and composite pile ◼ The installation of pile-precast concrete pile, cast-inplace concrete pile and prestress concrete pile ◼ The inserted method of pile-driving with blows, driving using a vibratory device, jacking and drilling a hole and inserting a pile into it
10.1 Introduction Suitable conditions of piles: -to carry the superstructure loads(both vertical and lateral loads)into or throught a soil stratum. -to resist uplift,or overturning,forces -to compact loose,cohesionless deposits. -to control settlements. -to stiffen the soil beneath machine foundation. -to protect bridge abutment when scour occur. -to tranmit loads above the water surface through the water and into the underlying soil in offshore construction. -to control earth movement(for example,landslide). -to penetrate below a soil layer that swells or consolidation
10.1 Introduction ◼ Suitable conditions of piles: ◼ -to carry the superstructure loads (both vertical and lateral loads) into or throught a soil stratum. ◼ -to resist uplift, or overturning, forces. ◼ -to compact loose, cohesionless deposits. ◼ -to control settlements. ◼ -to stiffen the soil beneath machine foundation. ◼ -to protect bridge abutment when scour occur. ◼ -to tranmit loads above the water surface through the water and into the underlying soil in offshore construction. ◼ -to control earth movement (for example, landslide). ◼ -to penetrate below a soil layer that swells or consolidation
10.2 Concrete Piles Conrete piles may be precast,prestressed,cast in place,or of composite construction. Precast concrete piles-piles are formed in a central casting yard to the specified length,cured,and then shipped to the construction site. -precast piles may be made using ordinary reinforcement or they may be prestressed. ■ -using ordinary reinforcement are designed to resist bending stresses during pickup and transport to the site and bending moments from lateral loads and to provide sufficient resistance to vertical loads and any tension forces developed during driving. -the minimum pile reinforcement should be 1 percent. -bending moments developed during pickup depending on the location of the pickup point
10.2 Concrete Piles ◼ Conrete piles may be precast, prestressed, cast in place, or of composite construction. ◼ Precast concrete piles-piles are formed in a central casting yard to the specified length, cured, and then shipped to the construction site. ◼ -precast piles may be made using ordinary reinforcement or they may be prestressed. ◼ -using ordinary reinforcement are designed to resist bending stresses during pickup and transport to the site and bending moments from lateral loads and to provide sufficient resistance to vertical loads and any tension forces developed during driving. ◼ -the minimum pile reinforcement should be 1 percent. ◼ -bending moments developed during pickup depending on the location of the pickup point