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Rethinking Spiral Requirements for Precast Prestressed Concrete Piles in Areas of High Seismicity
The evolution of spiral requirements for precast prestressed concrete piles in areas of high seismicity are the direct result of extensive engineering research over the past 20 years that has shown that pile ductility is directly related to the confinement provided by the spiral. Most codes and standards specify a minimum volumetric ratio of spiral that is a function of the applied axial load, material properties, and geometric configuration of the pile. Such prescriptive requirements are not performance based and may not ensure a ductile response of the structure. In many cases, piles designed prescriptively may be way overdesigned for the actual seismic displacement demand. Most research to date has focused on large dimensional piling (i.e., greater than 15 in. diameter) that is applicable primarily to bridge and pier/wharf type structures. Building typically use much smaller piling and the results of bridge and pier/wharf piling research has been too conservatively extrapolated to 10 in., 12 in., and 14 in. square piling commonly used in the building industry. Based on a target curvature ductility value of 20 for pile-to-pile cap connections, the results of a comprehensive parametric study of over 2,500 pile configurations is presented for 10 in., 12 in., and 14 in. square piles. Moment curvature analysis that neglects the contribution of soil confinement is utilized and the results are presented with respect to building foundations.
Rethinking Spiral Requirements for Precast Prestressed Concrete Piles in Areas of High Seismicity
The evolution of spiral requirements for precast prestressed concrete piles in areas of high seismicity are the direct result of extensive engineering research over the past 20 years that has shown that pile ductility is directly related to the confinement provided by the spiral. Most codes and standards specify a minimum volumetric ratio of spiral that is a function of the applied axial load, material properties, and geometric configuration of the pile. Such prescriptive requirements are not performance based and may not ensure a ductile response of the structure. In many cases, piles designed prescriptively may be way overdesigned for the actual seismic displacement demand. Most research to date has focused on large dimensional piling (i.e., greater than 15 in. diameter) that is applicable primarily to bridge and pier/wharf type structures. Building typically use much smaller piling and the results of bridge and pier/wharf piling research has been too conservatively extrapolated to 10 in., 12 in., and 14 in. square piling commonly used in the building industry. Based on a target curvature ductility value of 20 for pile-to-pile cap connections, the results of a comprehensive parametric study of over 2,500 pile configurations is presented for 10 in., 12 in., and 14 in. square piles. Moment curvature analysis that neglects the contribution of soil confinement is utilized and the results are presented with respect to building foundations.
Rethinking Spiral Requirements for Precast Prestressed Concrete Piles in Areas of High Seismicity
Mays, Timothy W. (author) / Hill, Thomas E. (author)
Structures Congress 2007 ; 2007 ; Long Beach, California, United States
2007-10-10
Conference paper
Electronic Resource
English
Rethinking Spiral Requirements for Precast Prestressed Concrete Piles in Areas of High Seismicity
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