摘要
为解决既有砌体结构抗震性能差,无法满足现行规范使用要求的问题,拟采用ECC对砌体墙进行加固,以提高其承载能力及抗震性能。对砖-砖、砖-ECC界面采用牵引-分离模型的方法,利用ABAQUS建立未加固砌体墙和加固砌体墙的精细化有限元模型,研究砌体墙在压剪荷载作用下的损伤模式、滞回性能、承载力及变形能力等。对比模拟与试验结果,验证了有限元模型的准确性,考虑砌筑砂浆强度、加固层厚度、ECC抗拉强度等进一步开展参数分析。研究表明:ECC面层可显著提高砌体墙的抗剪承载力、耗能能力及变形能力;提高砌筑砂浆强度、ECC抗拉强度和加固层厚度均可显著提升砌体墙的抗剪性能。本研究对既有民用建筑及电网系统重变电站等砌体结构的修复及加固具有重要指导意义。
To solve the problem of poor seismic performance of masonry structures and inability to meet the requirements of current specifications,it is proposed to use engineered cementitious composites(ECC)to strengthen the masonry panels,which can improve the bearing capacity and seismic performance of masonry structures.Based on the compression-shear tests on masonry panels strengthened with ECC,ABAQUS was used to establish refined finite element models of unreinforced masonry walls and reinforced masonry walls.Meantime,a traction separation model method was used for the brick/brick and brick/ECC interfaces.Vertical repeated load and single adjustable load were respectively applied diagonally along the wall to study the damage mode,hysteresis performance,bearing capacity,and deformation capacity of masonry walls.By comparing the numerical analysis results with experimental results,the accuracy of the finite element model was verified,and further parameterized analysis was carried out considering the strength of masonry mortar,the thickness of ECC overlay,and the tensile strength of ECC.The results demonstrate that ECC overlay can significantly improve the shear bearing capacity,energy dissipation capacity,and deformation capacity of the masonry wall.Increase the strength of mortar,the tensile strength of ECC,and the thickness of ECC overlay can significantly improve the shear performance of masonry walls.This research has important guiding significance for repairing or strengthening existing substation masonry structures.
作者
杨彦东
卢博
田浩
卜剑冲
YANG Yandong;LU Bo;TIAN Hao;BU Jiancong(Technological Research Institute,Ningxia Electric Power Co.,Ltd.,Yinchuan 750004,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第S01期261-267,共7页
Materials Reports
关键词
超高延性混凝土
砌体墙
抗剪加固
数值分析
抗剪性能
engineered cementitious composites
masonry panel
shear strengthening
numerical analysis
shear performance
