高强钢绞线网/ECC加固RC柱小偏心受压性能研究
作者:
作者单位:

郑州大学 土木工程学院,河南 郑州 450001

作者简介:

王新玲(1963—),女,河南新乡人,郑州大学教授,硕士生导师,博士. E-mail:xinlingwang@zzu.edu.cn

通讯作者:

范家俊(1990—),男,河南开封人,郑州大学讲师,博士. E-mail:jiajun.fan@zzu.edu.cn

中图分类号:

TU528.571

基金项目:

国家自然科学基金资助项目(51879243,51708511,52108183);国家自然科学基金-河南联合基金资助项目(U1804137);中国博士后科学基金资助项目(2021TQ0302)


Compressive Behavior of RC Columns Strengthened by High-Strength Steel Stranded Wire Meshes/ECC under Small Eccentric Compression
Author:
Affiliation:

School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

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    摘要:

    为研究高强钢绞线网/ECC(HSME)加固钢筋混凝土(RC)小偏心受压柱的正截面受力性能,对HSME加固RC柱、ECC加固RC柱和未加固RC柱进行了小偏心受压性能试验.结果表明:采用HSME加固后RC柱的整体性能得到显著提升,当采用相同的相对初始偏心距时,与未加固RC柱相比,HSME加固RC柱的开裂荷载、峰值荷载和延性分别提高了100.0%~113.3%、99.8%~108.0%、75.9%~77.8%;相同荷载下,HSME加固RC柱的ECC应变和纵筋压应变均小于ECC加固RC柱,HSME的加固效果更优;HSME加固层为核心混凝土提供了有效约束,改善了RC柱的损伤分布和破坏模式,显著提高了RC柱的承载力和延性;整个受压过程中,HSME加固层与RC柱混凝土协调变形,共同工作性能良好.

    Abstract:

    In order to investigate the mechanical behavior of normal cross-section of reinforced concrete(RC) columns strengthened by high-strength steel stranded wire meshes/ECC(HSME) under small eccentric compression, HSME strengthened RC columns, ECC strengthened RC column and unstrengthened RC column were prepared and tested under small eccentric compression. Results show that the overall performance of RC columns strengthened by HSME is improved significantly. Compared with the unstrengthened RC column, the cracking load, peaking load and ductility are increased by 100.0%-113.3%, 99.8%-108.0% and 75.9%-77.8% respectively. Under the same load, both the strain of ECC and the compressive strain of longitudinal reinforcement of HSME strengthened RC columns are smaller than those of ECC strengthened RC column. By contrast, RC columns strengthened by HSME have obvious advantages over the ECC strengthened RC column. Furthermore, the core concrete is effectively confined by the HSME reinforcement layer, which improves the damage distribution and failure pattern of RC columns and results in the significant improvements of the load-carrying capacity and ductility. During the whole loading process, the deformations of HSME reinforcement layer and original RC column concrete are coordinated and the cooperative working performance of them is satisfactory.

    表 1 试件参数Table 1 Parameters of specimens
    表 2 ECC配合比Table 2 Mix proportion of ECC
    表 5 主要试验结果Table 5 Main test results
    图1 RC柱尺寸和截面配筋示意图Fig.1 Geometries and reinforcement details of RC columns(size: mm)
    图2 加固RC柱示意图Fig.2 Reinforcement diagram of RC column(size: mm)
    图3 试验加载装置示意图Fig.3 Schematic of test setup
    图4 未加固RC柱的破坏形态Fig.4 Failure pattern of RC-C
    图5 ECC加固RC柱的破坏形态Fig.5 Failure pattern of ECC-RC
    图6 试件HSME-RC1的破坏形态Fig.6 Failure pattern of specimen HSME-RC1
    图7 各加固RC柱的裂缝分布Fig.7 Crack distribution of strengthened RC columns
    图8 荷载-应变曲线Fig.8 Load-strain curves
    图9 荷载-跨中侧向挠度曲线Fig.9 Load vs. mid-span lateral deflection curves
    图10 试件HSME-RC1的跨中截面应变分布Fig.10 Strain distribution at mid-span section of specimen HSME-RC1
    表 3 PVA纤维性能Table 3 Properties of PVA fibers
    表 4 ECC力学性能Table 4 Mechanical properties of ECC
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引用本文

王新玲,赵要康,王利超,罗鹏程,范家俊.高强钢绞线网/ECC加固RC柱小偏心受压性能研究[J].建筑材料学报,2023,26(1):29-36

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  • 收稿日期:2021-10-21
  • 最后修改日期:2022-01-05
  • 在线发布日期: 2023-02-01
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