摘要
为了减少液压静力压桩机夹桩机构压桩过程中的应力和变形,促进液压静力压桩机夹桩机构的改进,提高压桩质量,简述了抱压式液压静力压桩机的夹桩、压桩工作原理,利用ANSYS软件建立液压静力压桩机夹桩机构的参数化模型,设置模型中的主要参数,利用有限元系统内嵌的命令流式程序设计语言APDL编辑夹桩机构命令流式程序,对夹桩机构进行系列化有限元仿真分析,得出夹桩机构的等效应力云图、最大等效应力和最大合变形,并对仿真结果进行了分析和研究。仿真结果表明:夹桩、压桩时的夹桩机构的等效应力及位移分布不同;增大夹桩机构的压桩力和泊松比,以及在保证能正常压桩条件下,适当减小夹桩力能有效地降低液压静力压桩机夹桩机构的最大等效应力;增大夹桩机构的弹性模量和减小夹桩机构的压桩力,以及在保证能正常压桩条件下,适当减小夹桩力能有效地降低液压静力压桩机夹桩机构的最大合变形。
For cutting down the stress and displacement of pile clamping mechanism of hydraulic static pile drivers in the process of pile driving, promoting the pile clamping mechanism, and improving quality of pile driving, the working principle of pile clamping and pile driving were introduced briefly. The parametric model of pile clamping mechanism was constituted in ANSYS; the main parameters of the model were set. The command stream were programmed with APDL standing for ANSYS parametric design language. And then the serialization simulation analysis of pile clamping mechanism was achieved; the cloud diagram of Von Mises stress and the maximal Von Mises stress and displacement vector sum of pile clamping mechanism were elicited. The simulation results were analyzed. The simulation results show that the distributions of Von Mises stress and displacement vector sum of pile clamping mechanism in the process of pile driving are differ from the distributions in the process of pile clamping. Reducing becomingly pile clamping force when ensuring natural pile driving shall be done, and augmenting pile driving force and Poisson＇s ratio of pile clamping mechanism reduce effectively the maximal Von Mises stress of pile clamping mechanism; reducing pile driving force of pile clamping mechanism and augmenting elastic modulus of pile clamping mechanism reduce effectively the maximal displacement vector sum of pile clamping mechanism.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第1期159-163,共5页
Journal of Central South University:Science and Technology
基金
国家“863”计划资助项目(2003AA430200)
关键词
夹桩机构
有限元分析
变形
应力
液压静力压桩机
pile clamping mechanism
finite element analysis
displacement
stress
hydraulic static pile driver
