同济大学学报（自然科学版）2024，Vol.52Issue(5)：738-748,11.DOI:10.11908/j.issn.0253-374x.23213
风机荷载作用下频率比对砂土动力响应的影响
Effect of Frequency Ratio on Dynamic Responses of Sand Under Wind Turbine Loading
摘要
Abstract
The soil sample is subjected to a coupling effect of wind and wave action with various frequencies during the operation of offshore wind turbines.A series of tests were conducted to investigate the influence of the frequency ratio between wind and wave loads on sand using a multi-directional cyclic simple system(VDDCSS).The effect of frequency ratio on the dynamic strain,pore water pressure,and dynamic strength of sand was analyzed.The test results show that the development of shear strain is affected by the bidirectional frequency coupling and the combination of x and y-direction stress caused by the frequency ratio.At a CSR of 0.15,the bidirectional frequency coupling effect is greater than the stress combination effect.With the increase of the stress level(at a CSR of 0.20 or 0.25),both the frequency coupling effect and the stress combination effect are strengthened.At a low-stress level,the pore pressure curve of the failed specimen is"upward concave"and the frequency ratio has little effect on the pore pressure development of other specimens.As the stress level increases(at a CSR of 0.20 or 0.25),the final value of pore pressure umax increases with increasing CSR.Except for the samples corresponding to a fr of 1.00 and 10.00,the dynamic strength of others soil samples decreases with the increase of fr and CSR.At a f of 5.00,the sample has a large strain,a high pore pressure value,and a low dynamic strength,which is related to the superposition effect of the two-way frequency coupling and stress combination.关键词
循环单剪/频率比/动应变/动孔压/动强度Key words
cyclic simple shear/frequency ratio/dynamic strain/pore water pressure/dynamic strength分类
建筑与水利引用本文复制引用
张艳,贾敏才,蒋明镜,谢志伟..风机荷载作用下频率比对砂土动力响应的影响[J].同济大学学报（自然科学版）,2024,52(5):738-748,11.基金项目
国家自然科学基金(51639008,51890911) （51639008,51890911）
同济大学土木工程防灾国家重点实验室自主课题(SL-DRCE19-A-06) （SL-DRCE19-A-06）
海南省重点研发计划(ZDYF2021SHFZ264) （ZDYF2021SHFZ264）
