桩顶与承台两种连接方式下的桩基水平承载力试验研究  

Experimental Study on Seismic Behavior of Pile Foundation with Two Connection Modes of Pile Top and Pile Cap

作　　者：李晓勇[1] 高文生[1] 刘金砺[1] 

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑科学》2016年第5期77-83,共7页Building Science

基　　金：桩顶嵌固效应对桩基础抗震性能的影响研究(20141602336230036)

摘　　要：目前国内基桩与承台的连接方式是将桩顶嵌入承台50mm^100mm,再将锚筋插入承台一定深度,这是一种偏刚性的连接方式,地震过程中在桩-土-上部结构相互作用下,桩与承台连接部位会产生较大的负弯矩。1995年阪神大地震之后,日本有关学者提出了一种桩与承台的简易连接方式——F.T.Pile构造法(本文称之为臼式连接法),这是一种接近活性的连接方式。本次试验设计了4组试验桩,均是两桩承台,前两组桩与承台连接部位采用臼式连接法,后两组连接部位采用嵌入式连接法,通过现场足尺对比试验研究,发现臼式连接法可以有效降低桩顶负弯矩甚至消除桩顶负弯矩,但同时会增大桩身正弯矩及桩身位移,降低基桩水平承载力。The current way connecting pipe piles and pile caps is to embed pile tops into caps for 50mm- 100 mm and to insert anchor bars into caps for a certain depth. Under the interaction of pile-soil-structure in the process of earthquake,this connection mode will cause larger negative moment at the connecting position. F. T. Pile construction method is introduced,which is a method of proximity to the active connecting method. Comparing F. T. Pile method with the method in China,it is found that the former one could reduce the negative moment at pile tops effectively,but it would increase positive moment and displacement of the pile bodies at the same time,reducing horizontal bearing capacity of the piles consequently.

关 键 词：F.T.Pile构造法 刚性连接 半刚性连接 水平承载力 桩身弯矩 桩身位移 

分 类 号：TU473.11[建筑科学—结构工程]