预应力高强混凝土管桩的抗剪性能有限元分析  

FINITE ELEMENT ANALYSIS OF THE SHEAR BEHAVIOR OF PRESTRESSED HIGH-STRENGTH CONCRENTE PILES

作　　者：杨志坚[1] 雷岳强 YANG Zhi-jian;LEI Yue-qiang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《工程力学》2020年第S01期200-207,共8页Engineering Mechanics

基　　金：国家自然科学青年基金项目(51808353);辽宁省高等学校创新人才项目(LR2017077);沈阳市中青年科技创新人才支持计划项目(RC180270)。

摘　　要：采用ABAQUS软件,选取适合模型的本构关系,在验证模型正确性的基础上,建立21个预应力高强混凝土管桩有限元模型,考察剪跨比、轴压比、混凝土强度、增配普通钢筋以及预应力筋配筋率等参数对管桩极限抗剪承载力和P-Δ关系曲线的影响。分析结果表明:剪跨比、轴压比、预应力筋配筋率、增配普通钢筋对管桩的抗剪性能有影响,随着构件剪跨比的减小和预应力筋配筋率的增加,管桩的极限抗剪承载力有较大提高;增配普通钢筋后的管桩,与仅配预应力筋的管桩相比,其极限承载力更高,不同剪跨比下的曲线变化规律也与后者基本一致;增加混凝土强度可以提高管桩的抗剪承载力,但P-Δ关系曲线的弹性阶段几乎没有变化;管桩的极限抗剪承载力随着轴压比的提高而增大。By selecting suitable constitutive relations,we established 21 finite element models of prestressed high-strength concrete piles in ABAQUS.After verifying the correctness of the models,we investigated the shear span ratio,axial compression ratio,reinforcement rate of cube compressive strength of concrete and the prestressed reinforcement ratio influence parameters,such as the ultimate shear capacity of components and P−Δrelation curves.The results show that the shear span ratio has an effect on the shear performance of the piles,and that the ultimate shear capacity increases with the decreasing shear span ratio and the increasing ratio of prestressed bars.Compared with the prestressed members with ordinary reinforcement,the ultimate strength of the pile is higher,and the curve change rules under different shear span ratios are basically the same with the latter.Increasing the concrete strength can improve the shear strength of the pile,but the P−Δrelation curve at the elastic stage is almost the same.The ultimate shear capacity of the component increases with the increasing axial compression ratio.

关 键 词：预应力混凝土管桩 抗剪承载力 有限元分析 剪跨比 轴压比 

分 类 号：TU473.1[建筑科学—结构工程]