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原文传递 Minimum confinement reinforcement for prestressed concrete piles and a rational seismic design framework

题名：	Minimum confinement reinforcement for prestressed concrete piles and a rational seismic design framework
正文语种：	英文
作者：	Sri Sritharan;Ann-Marie Cox;Jinwei Huang;Muhannad Suleiman;K. Arulmoli
作者单位：	Iowa State University;Earth Mechanics Inc
关键词：	Axial load limit;confinement;design;foundation;moment-curvature idealization;pile;seismic.
摘要：	The design of prestressed concrete piles in seismic regions is required to include confinement reinforcement in potential plastic hinge regions. However, the existing requirements for quantifying this reinforcement vary significantly, often resulting in unconstructible details. This paper presents a rational approach for designing minimum confinement reinforcement for prestressed concrete piles in seismic regions. By varying key variables, such as the concrete strength, prestressing force, and axial load, the spiral reinforcement quantified according to the proposed approach provides a minimum curvature ductility capacity of about 18, while the resulting ultimate curvature is 28% greater than an estimated target curvature for seismic design. This paper also presents a new axial load limit for prestressed piles, an integrated framework for seismic design of piles and superstructure, the dependency of pile displacement capacity on surrounding soils, and how further reduction to confinement reinforcement could be achieved, especially in medium to soft soils and in moderate to low seismic regions.
出版日期：	2016.01-02
出版年：	2016
期刊名称：	PCI-Prestressed Concrete Institute Journal
卷：	Vol.61
期：	No.01
页码：	51-69