摘要
为探明不同类型地震波作用下桩基础的时程响应规律,通过振动台试验,选取强度均为0.35g的人工合成的5010波、5002波,以及Kobe波和El-Centro波,研究嵌岩单桩基础的桩身加速度、桩顶相对位移、桩身弯矩时程响应及桩基损伤。试验结果表明:嵌岩单桩基础动力响应特征与输入地震波频谱特性有关;桩顶加速度响应显著滞后于桩底,且在El-Centro波作用时桩身加速度峰值最大;桩顶相对位移在输入Kobe波时最大,在输入El-Centro波时峰值最早出现;桩身弯矩最大值均未超过桩基抗弯承载能力,且桩基础未发生损伤破坏;桩基础抗震设计时,可根据相应验算内容合理选择地震波类型进行抗震设计验算,并提出相应工程建议。
To explore the time-history response laws of pile foundation under different types of seismic waves,the pile acceleration of rock-socketed single pile foundation,relative displacement of pile top,bending moment of pile body and damage of pile foundation under the action of artificially synthesized 5010 waves,5002 waves,Kobe waves and El-Centro waves with an intensity of 0.35 g were studied through the shaking table test.The test results show that the dynamic response characteristics of rock-socketed single pile foundation are related to the spectrum characteristics of input seismic waves.The acceleration response of the pile top significantly lags behind that of the pile bottom,and the peak acceleration of the pile reaches the maximum value under the action of El-Centro waves.The relative displacement of the pile top is the largest when inputting Kobe waves,and the peak value appears earliest when inputting El-Centro waves.The maximum bending moment of the pile does not exceed the bending bearing capacity of the pile foundation,and there is no damage to the pile foundation.In the anti-seismic design of pile foundation,the type of seismic waves can be reasonably selected according to the corresponding checking content,and the corresponding engineering suggestions are proposed.
作者
冯忠居
张聪
何静斌
董芸秀
袁枫斌
FENG Zhong-ju;ZHANG Cong;HE Jing-bin;DONG Yun-xiu;YUAN Feng-bin(Key Laboratory for Special Area High Way Engineering of the Ministry of Education,Chang’an University,Xi’an,Shaanxi 710064,China;School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China;Engineering Experiment Monitoring Institute,Power China Northwest Engineering Corporation Limited,Xi’an,Shaanxi 710064,China;School of Civil Engineering,Longdong University,Qingyang,Gansu 745000,China;China Highway Engineering Consultants Corporation,Beijing 100089,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2021年第12期3227-3237,共11页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51708040)
长安大学中央高校基本科研业务费专项资金(No.300102218115)
海南省交通科技项目(No.HNZXY2015-045R)。
关键词
桩基础
强震
振动台试验
时程响应
piles foundation
strong earthquake
shaking table test
time-history response
