摘要
通过开展一系列离心机试验,研究中等密实砂土海床中吸力式单桶和群桶基础在长期循环加载下的循环特性,重点分析吸力桶基础在长期循环作用下的变形累积、刚度发展和阻尼演化规律。试验表明,在循环荷载作用下单桶基础的累积变形和刚度随循环次数的增加而增加,阻尼比与循环次数间满足指数关系。群桶基础在循环荷载作用下表现出"自愈效应",无明显的变形累积,卸载刚度随循环次数的增加先增加后减小,而阻尼比随循环次数的增加先减小后增大。
This study performed a series of centrifuge tests in the medium dense sand to systematically study the cyclic response of the bucket foundation. It was found under cyclic loading,the deflection of monopod bucket foundation keeps accumulating with increase of loading cycles. While the unloading stiffness decrease with loading amplitude and increase with loading cycle,the damping ratio decrease with loading cycles by a power function. The tripod bucket foundation exhibited a"self-healing"response under cyclic loading,resulting in little deflection accumulation. Due to the"self-healing"response,the unloading stiffness first increased then decreased with loading cycles,while the damping ratio first decreased then increased with loading cycles.
作者
何奔
罗金平
李炜
王欢
王立忠
洪义
He Ben;Luo Jinping;Li Wei;Wang Huan;Wang Lizhong;Hong Yi(Power China Huadong Engineering Limited Corporation,Hangzhou 310058,China;Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province,Hangzhou 310058,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2021年第9期332-337,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金/面上项目(51579227)
国家自然科学青年科学基金(51909249)
浙江省科学基金/青年基金(LQ19E090001)。
关键词
海上风力机
砂土
阻尼
刚度
变形
吸力桶基础
循环特性
offshore wind turbines
sand
damping
stiffness
deflection
suction bucket foundations
cyclic response
