预应力混凝土管桩与承台新型连接节点受力性能分析  

Analysis on Mechanical Behavior of Novel Connectionbetween Prestressed High StrengthConcrete Pile and Cap

作　　者：马传政[1] 谭雅文 杨志坚[1] MA Chuanzheng;TAN Yawen;YANG Zhijian(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Liaoning Shifang Geotechnical Engineering Co.Ltd.,Shenyang,China,110000)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]辽宁十方岩土工程有限公司,辽沈沈阳110000

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第5期853-861,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52178148);辽宁省优秀青年基金项目(2021-YQ-10);辽宁省教育厅面上项目(LJKMZ20220929)。

摘　　要：目的 为了改善预应力高强混凝土管桩与承台连接节点的受力性能,开发一种新型连接节点。方法 笔者在原有PHC管桩和PRC管桩与承台连接节点基础上,通过增设钢套模,在桩端和承台交接处预留出锥形空隙,避免桩端转动挤压承台造成承台破坏;基于两个预应力高强混凝土管桩与承台连接节点试验,采用ABAQUS对节点的受力性能进行分析。结果 在桩端和承台交接处预留锥形空隙,节点的承载能力没有明显的降低;桩端的压应力有所减小,桩端周边承台混凝土压应力大幅减小;桩端锚固钢筋、桩身预应力钢筋、普通钢筋应力状态与未加钢套模相比无明显变化;节点的传力机理无明显变化。结论 在桩端和承台交接处预留锥形空隙,可有效减小桩端转动对承台的挤压作用,避免承台在桩端转动时出现破坏。A new connection was developed to improve the mechanical performance of the connection between prestressed high-strength concrete pipe pile and cap.On the basis of the existing PHC pipe pile and PRC pipe pile connections,a conical gap is reserved at the intersection of pile-end and cap by adding a steel sleeve,so as to avoid the cap damage caused by the pile-end rotating and squeezing cap.Based on the results of two prestressed highstrength concrete pile-cap connections,finite element models were used to analyze the mechanical properties of these two types of connections under monotonic loading with ABAQUS.When the conical gap is reserved,the bearing capacity of the pile-cap connection does not decrease significantly.The compressive stress of pile-end decreases,and the compressive stress of concrete surrounding pile-end is greatly reduced.The stress state of pile-end anchorage bar,pile-body prestressed bar and ordinary bar has no obvious change compared with that without reserved conical gap.The force transfer mechanism of the connection has no obvious change.The results illustrated that the conical gap is reserved at the intersection of pile-end and cap,which can effectively reduce the squeezing effect of pile-end rotation on cap and avoid the damage of cap when pile-end rotation.

关 键 词：预应力混凝土管桩 连接节点 普通钢筋 锥形空隙 

分 类 号：TU473[建筑科学—结构工程]