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原文传递 Development of Bridge Column Longitudinal Reinforcement in Oversized Pile Shafts

题名：	Development of Bridge Column Longitudinal Reinforcement in Oversized Pile Shafts
其他题名：	AASHTO.(2010).LRFD bridge design specifications,5th Ed.,Washington,DC.
正文语种：	英文
作者：	Juan Murcia-Delso
关键词：	Development length;Bridge column;Pile shaft;Reinforced concrete;Reinforcing bars;Large-scale testing;Concrete and Masonry Structures
摘要：	This paper presents an experimental investigation to determine the embedment length required for longitudinal reinforcement in a bridge column extending into an oversized pile shaft, and the amount of transverse reinforcement required for the pile shaft to prevent premature bar anchorage failure due to concrete splitting induced by bar slip. Four full-scale column–oversized pile assemblies were tested under quasi-static cyclic lateral loading. The test specimens had different embedment lengths for the column reinforcement, different amounts of transverse reinforcement in the piles, different sizes of longitudinal bars, ranging from No. 8 to No. 18 (25 to 57 mm) bars, and different column-to-pile diameter ratios. All column–pile assemblies behaved in a ductile manner with plastic deformation occurring near the base of the columns despite some cone-shaped fractures and tensile splitting cracks occurring in the top portion of the piles. The test results show that the embedment length for the column reinforcement can be significantly reduced as compared to that required in current design specifications. The study also shows that an engineered steel casing designed according to a formula proposed here can effectively confine the pile shaft and significantly reduce splitting cracks.
出版年：	2016
论文唯一标识：	P-26Y2016V142N11029
英文栏目名称：	TECHNICAL PAPERS
doi：	10.1061/(ASCE)ST.1943-541X.0001591
期刊名称：	Journal of Structural Engineering
拼音刊名(出版物代码)：	P-26
卷：	142
期：	11
页码：	326-339