不均匀地基埋地箱涵伸缩缝的地震位移响应研究
|
摘要
对位于不均匀地基的某核电厂地下排水箱涵的地震反应进行了数值研究,着重探讨了箱涵伸缩缝的位移反应特性。采用场地相关地震动时程,考虑土体为理想弹塑性材料,基于FLAC~(3D)软件进行了非线性动力分析。结果表明,在地震作用过程中,埋地箱涵的位移取决于周围岩土体的运动;各管段的整体位移虽较大但各伸缩缝的相对位移数值较小;相邻箱涵段轴向不会发生碰撞;选择及设置伸缩缝止水带时应注意其横向最大变形应大于最大横向地震位移,以免发生剪切破坏。
Numerical research on seismic response of the buried drainage culverts on inhomogeneous foundation in a nuclear power plant was performed,especially displacement characteristics of contraction joints between adjoining drainage culverts was discussed.The site-related time history of accelerations was adopted and nonlinear dynamic analysis was conducted on the software platform FLAC,with rock and soil supposed being ideal elasto-plastic material. Results show that the displacements of culverts depend on the surrounding rock and soil.Though the overall displacements of each culvert were large in magnitude,but the relative displacements of contract joints between adjoining culverts were small.No collision would happen between adjoining culverts.When the water stop tie is selected and placed, attentions should be taken to its maximum cross-sectional deformation greater than the maximum seismic displacement of contraction joints to avoid the shear damage.
Numerical research on seismic response of the buried drainage culverts on inhomogeneous foundation in a nuclear power plant was performed,especially displacement characteristics of contraction joints between adjoining drainage culverts was discussed.The site-related time history of accelerations was adopted and nonlinear dynamic analysis was conducted on the software platform FLAC,with rock and soil supposed being ideal elasto-plastic material. Results show that the displacements of culverts depend on the surrounding rock and soil.Though the overall displacements of each culvert were large in magnitude,but the relative displacements of contract joints between adjoining culverts were small.No collision would happen between adjoining culverts.When the water stop tie is selected and placed, attentions should be taken to its maximum cross-sectional deformation greater than the maximum seismic displacement of contraction joints to avoid the shear damage.
引文
[1]林皋.地下结构抗震分析综述(上)[M].世界地震工程,1990, 2:1-10
[2]林皋.地下结构抗震分析综述(下)[M].世界地震工程,1990, 3:1-10
[3]Hashash Y M A,et al.Seismic design and analysis of underground Structures[J].Tunneling and Underground Space Technology,2001, 16:247-293
[4]国家地震局工程力学研究所,核工业第二研究设计院,上海核工程研究设计院,等.核电厂抗震设计规范(GB50267-97) [S].北京:中国计划出版社,1998
[5]Itasca Consulting Group Inc.,Fast Lagrangian analysis of continua in three dimensions(version 3.0),user' s manual[M].USA:Itasca Consulting Group,Inc.,2003
[2]林皋.地下结构抗震分析综述(下)[M].世界地震工程,1990, 3:1-10
[3]Hashash Y M A,et al.Seismic design and analysis of underground Structures[J].Tunneling and Underground Space Technology,2001, 16:247-293
[4]国家地震局工程力学研究所,核工业第二研究设计院,上海核工程研究设计院,等.核电厂抗震设计规范(GB50267-97) [S].北京:中国计划出版社,1998
[5]Itasca Consulting Group Inc.,Fast Lagrangian analysis of continua in three dimensions(version 3.0),user' s manual[M].USA:Itasca Consulting Group,Inc.,2003
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