UHPC中空柱轴心受压性能有限元分析  

Finite Element Analysis of Axial Compression Performance of UHPC Hollow Column

作　　者：徐周浩 谢青海 文哲鸣[1] 曾杰 李泽祥 XU Zhouhao;XIE Qinghai;WEN Zheming;ZENG Jie;LI Zexiang(School of Civil and Ocean Engineering,Jiangsu Ocean University,Lianyungang 222005,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]江苏海洋大学土木与港海工程学院,江苏连云港222005 [2]同济大学土木工程学院,上海200092

出　　处：《江苏海洋大学学报（自然科学版）》2024年第4期94-101,共8页Journal of Jiangsu Ocean University:Natural Science Edition

基　　金：国家自然科学基金资助项目(52378179);中国博士后科学基金资助项目(2020M681390);江苏省自然科学基金资助项目(BK20210925)。

摘　　要：为研究超高性能混凝土(ultra-high performance concrete,UHPC)中空柱在轴压下的极限承载力及其影响因素,设计了不同的壁厚、混凝土强度、纵筋配置以及箍筋间距的90个UHPC中空柱模型,开展轴心受压承载力研究。基于有限元模拟软件(ABAQUS)的数值仿真分析,采用控制变量法研究各因素对UHPC中空柱受压承载力的影响。研究结果表明:减小宽厚比、增加混凝土强度,可以显著提高UHPC中空柱的受压承载力;增加纵筋配筋率和配箍率,可以略微提高UHPC中空柱的受压承载力。其中,纵筋配筋率对承载力的影响略高于配箍率。此外,将9个UHPC中空柱的角部纵筋替换为玄武岩纤维增强复合材料(basalt fiber reinforced polymer,BFRP)筋后,前期刚度和受压承载力略有下降。基于受压承载力有限元分析结果,提出了UHPC中空柱的受压承载力简化计算公式,81个有限元模型的模拟值和公式计算值之比大多控制在2%误差内,有限元验证用的6个试验值与公式计算值控制在10%误差内。说明该公式具有较高精度,可为该结构构件的设计提供参考。To investigate the axial compression bearing capacity of ultra-high performance concrete(UHPC)hollow columns,90 UHPC hollow column models with varying wall thickness,concrete strength,longitudinal reinforcement configuration,and stirrup spacing were designed.The numerical simulation analysis was conducted using finite element simulation software(ABAQUS).The influence of various factors on the bearing capacity of UHPC hollow columns was studied by employing the control variable method.The results indicate that reducing the width-to-thickness ratio and increasing concrete strength can significantly enhance the bearing capacity of UHPC hollow columns.By increasing the longitudinal reinforcement ratio and stirrup ratio,the compressive bearing capacity of the hollow columns in UHPC can be slightly enhanced.Specifically,the influence of the longitudinal reinforcement ratio on the bearing capacity is slightly greater than that of the stirrup ratio.Additionally,the initial stiffness and bearing capacity of 9 UHPC hollow columns slightly decreased after replacing the corner longitudinal steel bars with basalt fiber reinforced polymer(BFRP)bars.Based on the finite element analysis results on the bearing capacity,a simplified calculation formula was proposed for the bearing capacity of UHPC hollow columns.The difference between the simulated values of 81 models and the calculated values via the formula was mostly within a 2%error line.Meanwhile,the six values from experiments were within the 10%error line.This indicates that the proposed formula has a high precision and can provide a reference for the design of UHPC hollow columns.

关 键 词：UHPC中空柱 有限元分析 轴压性能 极限承载力 简化计算模型 

分 类 号：TU528[建筑科学—建筑技术科学]