基于ANSYS的地震作用下群桩动力效应研究
|
摘要
文章采用有限元方法对地震作用下群桩-土的相互作用进行了分析,结合振动台试验,利用ANSYS11.0有限元分析软件建立试验模型,在相同的加载制度条件下进行数值模拟。通过合理的参数设定和接触模拟,群桩在地震作用下的位移场、加速度等与试验结果基本吻合。研究结果表明,群桩体系具有良好的整体性,地震作用下上部结构的破坏较小,然而在基础中由于单桩振动引起的对其邻桩的附加内力较大,造成明显的桩头局部破坏。分析结果为实际工程中地震作用下群桩的优化设计提供了简便有效的计算方法和合理的计算参数,同时对地震作用下群桩的动力效应及受力机理有了新的认识。
This paper analyzes the group pile-and-soil interaction under the impact of earthquakes by the finite element method(FEM) and establishes the test model with FEM software ANSYS11.0 on the basis of the vibration table test.The numerical simulation performed under the same loading system is also introduced.Through reasonable parameters setting and contact simulation,the displacement and acceleration under the influence of earthquakes almost conform to the experimental results.The research results indicate that under the action of earthquakes the superstructure suffers little destruction since the group pile system is featured by wholeness,however,the vibration of single piles leads to the palpable local damage to the structure because of additional inner force from the neighboring piles.The results offer an efficient calculating method and reasonable parameters for the optimal design of group piles in earthquake cases,and bring about a new idea on the dynamic effect and stress mechanism of group piles under earthquake actions.
This paper analyzes the group pile-and-soil interaction under the impact of earthquakes by the finite element method(FEM) and establishes the test model with FEM software ANSYS11.0 on the basis of the vibration table test.The numerical simulation performed under the same loading system is also introduced.Through reasonable parameters setting and contact simulation,the displacement and acceleration under the influence of earthquakes almost conform to the experimental results.The research results indicate that under the action of earthquakes the superstructure suffers little destruction since the group pile system is featured by wholeness,however,the vibration of single piles leads to the palpable local damage to the structure because of additional inner force from the neighboring piles.The results offer an efficient calculating method and reasonable parameters for the optimal design of group piles in earthquake cases,and bring about a new idea on the dynamic effect and stress mechanism of group piles under earthquake actions.
引文
[1]GB50040-96,动力基础设计规范[S].
[2]陈国兴.岩土地震工程学[M].北京:科学出版社,2007:411-415.
[3]吕西林,陈跃庆.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2000,20(4):20-29.
[4]钱德玲,夏京.支盘桩-土-高层建筑结构振动台试验的研究[J].岩石力学与工程学报,2009,(10):2024-2030.
[5]刘光磊,宋二祥.刚性桩复合地基水平受力性能有限元分析[J].工业建筑,2004,(11):41-44.
[6]赵元一.地震作用下桩-土-框架结构体系的数值模拟及分析[D].合肥:合肥工业大学土木与水利工程学院,2006.
[7]陈波,吕西林.用ANSYS模拟结构-地基相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126-131.
[8]吴志明.层状地基中的群桩水平振动[D].上海:同济大学岩土工程系,2005.
[2]陈国兴.岩土地震工程学[M].北京:科学出版社,2007:411-415.
[3]吕西林,陈跃庆.结构-地基动力相互作用体系振动台模型试验研究[J].地震工程与工程振动,2000,20(4):20-29.
[4]钱德玲,夏京.支盘桩-土-高层建筑结构振动台试验的研究[J].岩石力学与工程学报,2009,(10):2024-2030.
[5]刘光磊,宋二祥.刚性桩复合地基水平受力性能有限元分析[J].工业建筑,2004,(11):41-44.
[6]赵元一.地震作用下桩-土-框架结构体系的数值模拟及分析[D].合肥:合肥工业大学土木与水利工程学院,2006.
[7]陈波,吕西林.用ANSYS模拟结构-地基相互作用振动台试验的建模方法[J].地震工程与工程振动,2002,22(1):126-131.
[8]吴志明.层状地基中的群桩水平振动[D].上海:同济大学岩土工程系,2005.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心