预制混凝土螺旋桩体抗扭性能数值模拟  

Numerical Simulation on Torsional Behaviors of Precast Concrete Screw Pile Body

作　　者：李鑫[1] 梁力[1] 刘东霞[1,2] 王伟[1] 李明[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]辽宁大学经济学院,辽宁沈阳110136

出　　处：《沈阳建筑大学学报（自然科学版）》2010年第3期492-496,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：辽宁省交通厅重点科研项目(0408-2);沈阳市科技攻关项目(20040528)

摘　　要：目的为了提高预制混凝土螺旋桩的抗扭能力,对预制混凝土桩体的开裂扭矩、极限扭矩、扭转变形等抗扭性能进行数值模拟.方法采用有限单元法(FEM)对预制混凝土桩体抗扭性能进行了计算,并与试验结果进行了对比.最后通过数值正交试验研究了混凝土强度等级、预应力度、螺旋箍筋螺距、保护层厚度和螺旋箍筋直径5个参数对预制混凝土桩体抗扭性能的影响.结果得到了各种桩型的开裂扭矩、极限扭矩、扭矩-扭率曲线及各影响参数对预制混凝土桩体的开裂扭矩和极限扭矩的影响曲线.结论得出了计算预制混凝土桩体抗扭性能的合理有限元模型,并确定了预制混凝土螺旋桩的合理桩型及合理设计参数,为预制混凝土螺旋桩的施工与设计提供了有利数据.In order to improve the torsional resistance of precast concrete screw pile,the cracking torsion,the ultimate torsion and the torsional deformation of precast concrete pile body were simulated numerically.The torsional behaviors were calculated by using finite element method.And the numerical results were compared with experimental results.In addition,the influence of the five factors including strength levels of concrete,degree of prestress,pitch of spiral hoop,concrete cover and diameter of spiral hoop on the torsional behav-iors of precast concrete pile body were researched by numerical orthogonal test.At last,the rational finite element model was concluded for calculating the torsional behaviors of precast concrete pile body,and the ra-tional pile type and design parameters of precast concrete screw pile were found.

关 键 词：螺旋桩 预应力混凝土 抗扭性能 有限单元法 ANSYS软件 

分 类 号：TU311.41[建筑科学—结构工程]