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黏弹性人工边界等效载荷计算的改进方法

章小龙 李小军 陈国兴 周正华

章小龙, 李小军, 陈国兴, 周正华. 黏弹性人工边界等效载荷计算的改进方法[J]. 力学学报, 2016, 48(5): 1126-1135. doi: 10.6052/0459-1879-16-070
引用本文: 章小龙, 李小军, 陈国兴, 周正华. 黏弹性人工边界等效载荷计算的改进方法[J]. 力学学报, 2016, 48(5): 1126-1135. doi: 10.6052/0459-1879-16-070
Zhang Xiaolong, Li Xiaojun, Chen Guoxing, Zhou Zhenghua. AN IMPROVED METHOD OF THE CALCULATION OF EQUIVALENT NODAL FORCES IN VISCOUS-ELASTIC ARTIFICIAL BOUNDARY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(5): 1126-1135. doi: 10.6052/0459-1879-16-070
Citation: Zhang Xiaolong, Li Xiaojun, Chen Guoxing, Zhou Zhenghua. AN IMPROVED METHOD OF THE CALCULATION OF EQUIVALENT NODAL FORCES IN VISCOUS-ELASTIC ARTIFICIAL BOUNDARY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(5): 1126-1135. doi: 10.6052/0459-1879-16-070

黏弹性人工边界等效载荷计算的改进方法

doi: 10.6052/0459-1879-16-070
基金项目: 国家自然科学基金(41374049,51421005)和国家重点基础研究发展计划(2011CB013601)资助项目.
详细信息
    通讯作者:

    李小军,研究员,主要研究方向:地震学与防灾减灾工程.E-mail:beerli@vip.sina.com

    陈国兴,教授,主要研究方向:土动力学与岩土地震工程.E-mail:gxchen@njtech.edu.cn

  • 中图分类号: O345;O302

AN IMPROVED METHOD OF THE CALCULATION OF EQUIVALENT NODAL FORCES IN VISCOUS-ELASTIC ARTIFICIAL BOUNDARY

  • 摘要: 黏弹性人工边界在场地地震反应和结构-地基动力相互作用等问题的计算中已得到了广泛的应用.地震波在黏弹性人工边界中的输入是通过将地震波转化为作用于人工边界处的等效载荷来实现的.计算等效节点载荷的常规方法默认边界节点对应区域内的应力为均布力,但实际上该节点对应区域内的应力分布通常是不均匀的.本文在有限元方法结合黏弹性局部人工边界的显式时域波动方法的基础上,建立了无限域散射问题地震波等效载荷计算的一种改进方法.该方法采用细化网格与应力积分相结合的方法计算人工边界等效节点力,有效地降低了人工边界上等效节点力的计算误差.以不同角度入射地震波的二维算例为例,算例给出的波场位移云图和节点位移时程曲线验证了本文方法的有效性,其计算精度与网格尺寸和地震波入射角度密切相关,且网格越小、入射角度越小,计算精度越高.对于相同的网格尺寸,本文采用方法的计算精度明显高于常规方法,尤其是对于斜入射问题优势更为明显.

     

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出版历程
  • 收稿日期:  2016-03-11
  • 修回日期:  2016-04-27
  • 刊出日期:  2016-09-18

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