轴力对预应力高强混凝土管桩抗震性能的影响  

Effect of Axial Force on Seismic Performance of Prestressed High-strength Concrete Piles

作　　者：杨志坚[1] 盖常宏 YANG Zhijian;GAI Changhong(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第3期423-431,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52178148,51808353);辽宁省优秀青年基金项目(2021-YQ-10);“兴辽英才计划”青年拔尖人才项目(XLYC2203109)。

摘　　要：目的研究轴力和往复荷载作用下预应力高强混凝土管桩的抗震性能,为预应力高强混凝土管桩的设计和实际工程应用提供参考依据。方法应用ABAQUS有限元软件对预应力高强混凝土管桩进行有限元模拟,并与已有试验结果对比,两者吻合良好,验证了模型的准确性。在此基础上,研究轴压比和有无普通钢筋及普通钢筋直径对预应力高强混凝土管桩滞回曲线、骨架曲线、刚度退化、延性及耗能能力的影响。结果配置普通钢筋可以提高预应力高强混凝土管桩的承载能力和延性,对刚度影响不大;随着轴压比的增加,预应力高强混凝土管桩的承载能力逐渐提高,但延性变差,轴压比为0.45时,预应力高强混凝土管桩发生脆性破坏。结论配置普通钢筋可以有效改善预应力高强混凝土管桩的抗震性能,预应力高强混凝土管桩的轴压比不宜超过0.3。To study the seismic performance of prestressed high-strength concrete pipe piles under axial force and reciprocating load,the finite element software ABAQUS is used to simulate the prestressed high-strength concrete pipe piles,and compared with existing experimental results.On the basis of verifying the accuracy of the model,the effects of axial compression ratio,the presence or absence of ordinary steel bars,and the diameter of ordinary steel bars on the hysteresis curve,skeleton curve,stiffness degradation,ductility,and energy dissipation capacity of prestressed high-strength concrete pipe piles are studied.The research results show that the configuration of ordinary steel bars can improve the bearing capacity and ductility of prestressed high-strength concrete pipe piles,with little impact on stiffness;as the axial compression ratio increases,the bearing capacity of prestressed high-strength concrete pipe piles gradually increases,but the ductility worsens.When the axial compression ratio is 0.45,the prestressed high-strength concrete pipe piles undergo brittle failure,and the axial compression ratio of the prestressed high-strength concrete pipe piles should not exceed 0.3.

关 键 词：预应力高强混凝土管桩 轴压比 抗震性能 滞回曲线 

分 类 号：TU378[建筑科学—结构工程]