摘要
基于附加质量模型研究了管桩的扭转振动特性,为管桩的无损检测、动力基础设计和抗震设计提供了新的理论依据。首先,推导出管桩桩顶复刚度和速度频域响应解析解及半正弦脉冲激振力作用下桩顶速度时域响应半解析解;然后将该文解与经典的平面应变解进行对比,验证本文解的合理性;最后分析土塞高度和土塞与管桩之间的阻尼作用对管桩扭转振动特性的影响。分析表明：土塞高度和土塞与管桩之间的阻尼作用是影响管桩扭转复刚度的重要因素;随着土塞高度的增加和土塞与管桩之间阻尼作用的增强,填充土塞段管桩的扭转综合波速会逐渐减小。
The torsional dynamic response of pipe piles is investigated based on the additional mass model. It can provide a new theoretical basis for non-destructive integrity testing of pipe piles, design of dynamic foundation and earthquake-resistant design. First, the analytical solutions for complex stiffness and velocity response in the frequency domain and the corresponding quasi-analytical solutions for velocity response in the time domain at pile head are derived. Then, the rationality and accuracy of the solutions are verified by comparing the dynamic behaviors of the pipe piles calculated by the additional mass model with those based on the plane strain model. Finally, the influences of the soil plug height and the damping effect between soil plugs and pipe piles on the torsional dynamic response of pipe piles are analyzed. The results show that the soil plug height and the damping effect between soil plugs and pipe piles have an important influence on the torsional complex stiffness of pipe piles. The test torsional velocity of pipe pile decreases as the soil plug height and the damping effect between soil plugs and pipe piles increase.
作者
刘浩
蒋国盛
梅国雄
梁荣柱
吴文兵
LIU Hao;JIANG Guo-sheng;MEI Guo-xiong;LIANG Rong-zhu;WU Wen-bing(Engineering Research Center of Rock-Soil Drilling ＆ Excavation and Protection, Ministry of Education, Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;Guangxi Key Laboratory of Disaster Prevention and Structural Safety, College of Civil Engineering and Architecture, Guangxi University, Narming 530004, China;Key Laboratory of Disaster Prevention and Structural Safety, Ministry of Education, Guangxi University, Nanning 530004, China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2018年第4期716-725,共10页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51309207,51678547)
中国博士后科学基金面上项目(2016M600711)
中央高校基本科研业务费专项资金摇篮计划项目(CUGL150411)
岩土钻掘与防护教育部工程研究中心开放基金项目(201402)
关键词
管桩
扭转振动
土塞效应
附加质量模型
动力特性
pipe pile
torsional vibration
soil plug effect
additional mass model
dynamic characteristic
