摘要
对《预应力混凝土管桩图集》中的管桩与承台的接桩节点进行了改进,提出了取消填芯混凝土、将锚固钢筋安装于端板并增设下锚钢筋的接桩节点形式。利用数值模型验证了上锚钢筋与下锚钢筋的作用及接桩节点的抗拔承载力。计算结果表明:所提出的上锚钢筋布置方案是合理的,提出的下锚钢筋可以延缓管桩端部的开裂,取消填芯混凝土的接桩节点具有充足的抗拔承载力。
In order to improve the uplift bearing capacity of PHC pile and pile cap splicing connection proposed from Atlas of Prestressed Concrete Pipe Piles,a new type of connection joint without the filled core concrete was proposed,which installed anchor bars on the end plates and added lower achor bars. The numerical model was used to verify the effect of the upper and lower anchor bars,and the uplift bearing capacity of the connection joint. According to the simulation results,the layout of the upper anchor bars was reasonable.The lower anchor bars could delay the cracking of the PHC pile ends and the new connection joint showed a good uplift bearing capacity.
引文
[1]中国建筑标准设计研究院.预应力混凝土管桩图集[S].北京:中国计划出版社,2008.
[2]GUAN Z,CHEN X,LI J.Experimental Investigation of the Seismic Performance of Bridge Models with Conventional and Rocking Pile Group Foundations[J].Engineering Structures,2018,168:889-902.
[3]刘永超,郑刚,顾晓鲁.抗拔管桩及其填芯混凝土受拉结构性能试验[J].天津大学学报(自然科学与工程技术版),2012,45(6):487-492.
[4]郑刚,张天奇,李庆钢,等.考虑剪跨比及截桩填芯影响的PHC管桩抗剪承载力试验研究[J].土木工程学报,2014(7):97-109.
[5]陈巧,陈芳斌,侯善民.预应力混凝土抗拔管桩与承台连接方法探讨[J].建筑结构,2011,41(增刊2):362-365.
[6]虞林军.先张法预应力混凝土管桩作为抗拔桩的设计[J].建筑结构,2006,36(3):60-61.
[7]熊昊,刘润,徐余.抗拔桩承载特性研究与三维数值仿真分析[J].工程地质学报,2013,21(3):400-407.
[8]林巍,吴杰,周建炉.抗拔桩基承台的数值模拟研究[J].建筑结构,2016,46(增刊1):795-798.
[9]杨爱国,植万镒,朱靖.等截面抗拔桩承载机理的有限元分析[J].工业建筑,2008,38(增刊1):671-676.