土体强度折减对海上升压站结构抗震设计的影响
Effect of Soil Strength Reduction upon the Seismic Design of Offshore Substation
廖望 1焦钰祺 2姜娟 3陈立 3乔东生2
作者信息
- 1. 上海勘测设计研究院有限公司,上海 200335;大连理工大学 水利工程博士后流动站,辽宁 大连 116024
- 2. 大连理工大学 海岸和近海工程国家重点实验室,辽宁 大连 116024
- 3. 上海勘测设计研究院有限公司,上海 200335
- 折叠
摘要
通过有限元非线性时程分析,对比API规范法与考虑土体强度折减作用后某海上升压站桩基及上部平台结构的水平向应力与变形等主要设计指标,结果表明,考虑土体强度折减后,土体对于桩基的水平向约束力减弱,单桩的变形与受力均出现大幅增加,且上部结构的整体水平运动特征更为显著,使用API规范计算上部平台结构的应力结果偏保守,建议在海上升压站的桩基础设计时根据场地土的特性选取土体强度折减模型并着重校核桩基础的关键设计指标.
Abstract
The FEM nonlinear time-history analyses were used to compare the main design indexes such as the horizontal stress and deformation of an offshore substation considering the strength reduction of soil.The results showed that after consider-ing the reduction of soil strength,the deformation and stress of the pile increases greatly due to the weakening of the constraint of the soil on the pile foundation,and the overall horizontal motion characteristics of the upper structure are more significant.The stress results of the upper platform structure calculated by the API specification are conservative.It is suggested that the soil strength reduction model should be selected according to the characteristics of the site and the design indexes of the pile founda-tion should be checked in the design of offshore substation.
关键词
海上升压站/桩-土相互作用/强度折减/抗震设计/有限元分析/非线性时程分析Key words
offshore substation/pile-soil interaction/strength reduction/seismic design/FEM analysis/nonlinear time-history analysis引用本文复制引用
基金项目
国家自然科学基金(51890915)
上海市浦江人才计划(22PJD097)
上海勘测设计研究院有限公司科研项目(2022QT83-048)
上海勘测设计研究院有限公司科研项目(2022QT831-007)
中国长江三峡集团有限公司科研项目(202203004)
出版年
2024
NETL
NSTL
万方数据