摘要
FRPC桩是将FRP材料与传统材料结合形成的一种新型组合桩,具有良好的抗物理化学侵蚀、轻质高强等优点。为了研究水平循环荷载作用下FRPC桩与砂土的动力相互作用,设计水平双向循环加载装置,对干砂中的FRPC模型桩施加静载和水平循环荷载,分析FRPC桩侧砂土产生的水平动力抗随着荷载大小、加载方式、循环荷载的频率、次数和埋深的变化规律。试验结果表明:循环荷载幅值较小时,土抗力的幅值随着循环次数的变化在FRPC桩的上端所受的影响较大,且循环次数200次到700次之间的影响较大;循环荷载幅值较小时,桩周最大被动土抗力和桩周最大主动土抗力均随着循环次数的增多而减小;FRPC桩侧土抗力随着频率的增大而增大,循环荷载加载产生的桩周土抗力比静载作用时要高,埋深影响着FRPC桩沿桩身的分布规律。
FRPC pile is a new type of composite pile formed by combining FRP material with traditional material,which has the advantages of good physical and chemical erosion resistance,light weight and high strength.In order to study the dynamic interaction between FRPC pile and sand under horizontal cyclic load,a horizontal bidirectional cyclic loading device was designed to apply static load and horizontal cyclic load to FRPC model pile in dry sand.The variation rule of horizontal dynamic resistance generated by sand at the side of FRPC pile with load size,loading mode,frequency,times and buried depth of cyclic load is analyzed.The test results show that when the cyclic load amplitude is small,the amplitude of soil resistance with the change of cyclic times has a great influence on the upper end of FRPC pile,and the influence of cyclic times is between 200 and 700 times.When the cyclic load amplitude is small,both the maximum passive soil resistance and the maximum active soil resistance around the pile decrease with the increase of the number of cycles.The soil resistance around the FRPC pile increases with the increase of frequency,and the soil resistance around the pile under cyclic load is higher than that under static load,and the buried depth affects the distribution of the FRPC pile along the pile body.
作者
黄国华
王莉
曾国平
龚维明
HUANG Guohua;WANG Li;ZENG Guoping;GONG Weiming(Power China Road Bridge Group Co.,Ltd.,Beijing 100037,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)
出处
《建筑结构》
北大核心
2023年第S01期2682-2686,共5页
Building Structure
基金
中电建路桥集团有限公司科技项目(LQKY2017-06)
国家自然科学基金(51478109)
关键词
桩基础
FRPC桩
水平循环荷载
循环频率
pile foundation
FRPC pile
horizontal cyclic load
cyclic frequency
