变径桩柱法兰连接可靠性试验研究
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；
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[5] 王雪芹，刘学春，王鹤翔.柱与柱法兰连接对多高层钢框架结构性能影响研究[J].钢结构，2017,32(7):21-24.
[6] 刘学春，和心宁，张爱林，等.拉-弯-剪组合作用下法兰连接方钢管柱受力性能研究[J].建筑结构学报，2018,39(6):69-80.
[7] 王元清，宗亮，石永久.钢管结构法兰连接节点抗弯承载性能的试验研究[J].湖南大学学报(自然科学版),2011,38(7):13-19.
[8] 丁娟，杨彬，李瑞锋，等.采用钢板攻丝高强螺栓法兰连接的装配式钢框架柱受力性能研究[J].建筑结构学报，2016,37(8):143-150.
[9] 魏民，王吉生.公路预制高强混凝土空心圆形桥墩及新型法兰连接的研究[J].工程与建设，2018,32(6):914-916,926.
[10] 宗亮，王元清，石永久.钢管结构法兰连接节点抗弯承载性能的有限元分析[J].中北大学学报(自然科学版),2011,32(4):431-436.
[11] 孙鹏，王元清，石永久.方钢管法兰连接承载性能的有限元分析[J].中北大学学报(自然科学版),2009,30(5):430-435.
[12] 王元清，孙鹏，石永久.圆钢管法兰连接承载性能的有限元分析[J].钢结构，2009,24(8):16-20.
[13] 丁怡宣，曾玉昆，韩军峰，等.法兰连接预制装配桥墩力学性能分析[J].自然灾害学报，2019,28(4):40-51.
Experimental study on reliability of flange connection of variable diameter pile-column
Abstract: Based on a practical project in Xiong'an New area, the seismic performance of variable diameter flange connection between PRC pile and prefabricated pipe columns was studied by full-scale model pseudo-static test. The reliability and seismic performance of flange connection of variable diameter pile-column were investigated by studying the failure phenomenon, hysteretic curve, skeleton curve, residual deformation and flange bending angle, and the damage process and ultimate failure form of the specimens were revealed. The experimental results show that the strength of the flange is relatively high, and the stiffener and flange plate did not buckle. The strength of the connection between the pile column 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 pipe column and the pipe pile longitudinal reinforcement and corresponding optimization measures were proposed to provide technical support for the design of flange connection of variable diameter pile-column.
Keywords: prefabricated assembly; pile-column foundation; variable diameter flange; connection reliability
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