剪力环对钢管复合桩受力及变形特性的影响研究  

STUDY OF INFLUENCE OF SHEAR RING ON FORCE AND DEFORMATION PROPERTIES OF STEEL TUBULAR COMPOSITE PILE

作　　者：张敏[1] 马建林[1] 柴瑞 吴伟胜 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]港珠澳大桥管理局,广东珠海519015 [3]中交公路规划设计有限公司,北京100088

出　　处：《工业建筑》2013年第11期67-72,88,共7页Industrial Construction

基　　金：铁道部重大科技项目子课题(2008G032-F);港珠澳大桥跨海集群工程建设关键技术研究与示范项目(2011BAG07B00)

摘　　要：为研究压-弯-剪复杂受力状态下,剪力环对钢管复合桩受力及变形特性的影响,开展了5组室内模型试验,其中4组钢管复合桩设有剪力环,剪力环间距分别取1D、1.5D、2D和3D(D为钢管复合桩直径)四种。基于对试验结果的分析,进一步探讨剪力环间距对钢管复合桩弯曲刚度的影响。研究结果表明:剪力环能够提高钢管复合桩横向变形的能力。在剪力环间距不小于2D的条件下,钢管复合桩桩端钢管的受力及变形显著增加,使得钢管复合桩桩端截面变形呈"m"型分布。最后,给出剪力环对钢管复合桩弯曲刚度影响的表达式,两者呈双曲线规律变化。To investigate the effects of shear ring on the force and deformation characteristics of steel tubular composite （STC） piles under axial load-moment-lateral load, five specimens with different combinations of shear ring, drilling mud skin and anti-corrosion coating were tested, in which four specimens with shear ring, 1D, 1.5D, 2D, and 3D （D was the pile diameter） were taken as its spacing. Based on analysis of the test results, the effects of shear ring on STC pile bending stiffness were studied. The results obtained from the tests showed that the bearing capacity for lateral deformation of STC pile was greatly improved by shear ring. Also, the force and deformation of STC pile end were significantly increased, when the spacing of shear ring was more than 2D. That resulted in the strains at cross section of pile tip in the shape of ＂m＂. Finally, the relation between bending stiffness increment of STC piles and shear ring spacing was formulated, both of which showed a hyperbolic law change.

关 键 词：模型试验 钢管复合桩 剪力环 受力及变形特性 弯曲刚度 

分 类 号：TU473.1[建筑科学—结构工程]