(1 石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室, 石家庄 050043;2 石家庄铁道大学土木工程学院, 石家庄 050043; 3 河北省交通规划设计研究院有限公司,石家庄 050011)

摘要: 以雄安新区某实际工程为研究背景,通过足尺模型拟静力试验研究了 PRC 管桩与预制管柱变径法兰连接方式的抗震性能,从试件的破坏现象、滞回曲线、骨架曲线、残余变形、法兰弯矩转角关系等方面探究了变径桩柱法兰连接的可靠性及抗震性能,揭示了试件的损伤过程和最终破坏形式. 试验结果表明:法兰强度较高,加劲肋和法兰板没有出现屈曲. 桩柱混凝土与端板连接强度较低,在试验过程中此处产生较大的粘结裂缝,预制管柱与管桩纵筋产生的较大滑移是试件承载力下降的主要原因,并提出了相应的优化措施,为变径桩柱法兰连接设计提供技术支撑.

关键词: 预制拼装; 桩柱式基础; 变径法兰; 连接可靠性

中图分类号:U442. 5+5 文献标志码:A 文章编号:1002-848X(2023)12-0121-05

DOI:10. 19701 / j. jzjg. 20201752

Experimental study on reliability of flange connection of variable diameter pile-column

GUO Jin1,2, SUN Ruojin2, ZHANG Weiheng2, LI Zhicong3, SONG Hao2, CHEN Wei2

(1 State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, ShijiazhuangTiedao University, Shijiazhuang 050043, China; 2 School of Civil Engineering, Shijiazhuang Tiedao University,Shijiazhuang 050043, China; 3 Hebei Provincial Communications Planning, Design and Research Institute Co. , Ltd. ,Shijiazhuang 050011, China)

Abstract: Based on a practical project in Xiong’ an New area, the seismic performance of variable diameter flangeconnection between PRC pile and prefabricated pipe columns was studied by full-scale model pseudo-static test. Thereliability and seismic performance of flange connection of variable diameter pile-column were investigated by studying thefailure phenomenon, hysteretic curve, skeleton curve, residual deformation and flange bending angle, and the damageprocess and ultimate failure form of the specimens were revealed. The experimental results show that the strength of theflange is relatively high, and the stiffener and flange plate did not buckle. The strength of the connection between the pilecolumn concrete and the end plate is relatively low, and large bonding cracks were generated here during the experiment.The main reason for the decrease in the bearing capacity of the specimen is the large slippage between the precast pipecolumn and the pipe pile longitudinal reinforcement and corresponding optimization measures were proposed to providetechnical support for the design of flange connection of variable diameter pile-column.

Keywords:prefabricated assembly; pile-column foundation; variable diameter flange; connection reliability

∗国家自然科学基金资助项目(51508351、51508350),河北省自然科学基金资助项目(E2017210117),河北省高等学校科学技术研究项目(ZD2017071).

第一作者:郭进,博士,副教授,主要从事桥梁抗震研究,Email:jinguo@ stdu. edu. cn.

[引用本文] 郭进,孙若津,张卫恒,等. 变径桩柱法兰连接可靠性试验研究[ J]. 建筑结构,2023,53(12):121-125,137. GUO Jin,SUN Ruojin,ZHANG Weiheng,et al. Experimental study on reliability of flange connection of variablediameter pile-column[J]. Building Structure,2023,53(12):121-125,137.