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冻融-弯曲荷载耦合作用下PP-ECC梁的抗弯性能

李福海 杨宗驰 刘耕园 刘梦辉 吴昊南 陈昭 李固华

李福海, 杨宗驰, 刘耕园, 刘梦辉, 吴昊南, 陈昭, 李固华. 冻融-弯曲荷载耦合作用下PP-ECC梁的抗弯性能[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220645
引用本文: 李福海, 杨宗驰, 刘耕园, 刘梦辉, 吴昊南, 陈昭, 李固华. 冻融-弯曲荷载耦合作用下PP-ECC梁的抗弯性能[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220645
LI Fuhai, YANG Zongchi, LIU Gengyuan, LIU Menghui, WU Haonan, CHEN Zhao, LI Guhua. Flexural Performance of PP-ECC Beams under Coupling of Freeze-Thaw Cycles and Bending Loads[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220645
Citation: LI Fuhai, YANG Zongchi, LIU Gengyuan, LIU Menghui, WU Haonan, CHEN Zhao, LI Guhua. Flexural Performance of PP-ECC Beams under Coupling of Freeze-Thaw Cycles and Bending Loads[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220645

冻融-弯曲荷载耦合作用下PP-ECC梁的抗弯性能

doi: 10.3969/j.issn.0258-2724.20220645
基金项目: 国家重点研发计划(2021YFB2600900);四川省自然科学基金(2023NSFSC0025,2021YJ0545,2022NSFSC1095)
详细信息
    作者简介:

    李福海(1979—),男,教授级高级工程师,研究方向为混凝土材料及其耐久性,E-mail:lifuhai2007@home.swjtu.edu.cn

    通讯作者:

    李固华(1963—),男,教授,博士,研究方向为混凝土结构安全与其耐久性, E-mail:lgh-100@vip.163.com

  • 中图分类号: TU528.41

Flexural Performance of PP-ECC Beams under Coupling of Freeze-Thaw Cycles and Bending Loads

  • 摘要:

    为探究冻融以及冻融-弯曲荷载耦合作用对聚丙烯纤维水泥基复合材料(PP-ECC)梁抗弯性能的影响,设置7种试验工况,采用三分点加载方式对PP-ECC梁抗弯性能进行研究,分析冻融及冻融-弯曲荷载耦合作用下PP-ECC梁的荷载-跨中挠度曲线、抗弯承载力及裂缝发展形态差异;基于计算假定和正常环境下PP-ECC梁抗弯承载力的计算模型,结合PP-ECC材料冻融劣化机理,推导出PP-ECC梁在冻融环境下抗弯承载力计算模型;在此基础上引入持荷损伤系数γ,建立冻融-弯曲荷载耦合作用下PP-ECC梁抗弯承载力计算模型. 研究结果表明:不同持荷比的PP-ECC梁极限抗弯承载力在冻融循环作用下出现不同程度降低,500次冻融循环后,持荷比为0、0.25、0.50的PP-ECC梁极限抗弯承载力分别降低了28.70%、27.09%,35.69%;受拉区PP-ECC材料开裂后不退出工作仍能协同受拉钢筋参与全截面受力;PP-ECC 梁在达到极限状态时,受拉区呈多条裂缝稳态发展模式,且随冻融损伤加剧,梁体最大裂缝宽度增大、裂缝数量减少;单一冻融以及冻融-弯曲荷载耦合作用下的PP-ECC梁仍满足平截面假定;基于平截面假定建立的冻融和冻融-弯曲荷载耦合作用下PP-ECC 梁的抗弯承载力计算模型吻合度分别到达0.88~1.06和0.96~1.10.

     

  • 图 1  试件构造

    Figure 1.  Structure of the specimen

    图 2  温湿度循环示意

    Figure 2.  Temperature and humidity cycle

    图 3  持荷冻融试件加载装置

    Figure 3.  Loading device for load-bearing freeze-thaw specimens

    图 4  三分点加载试验

    Figure 4.  Three-point loading test

    图 5  应变片布置图

    1—荷载传感器;2—分配工装;3—PP—ECC梁侧面;4—铰支座;5—应变片;6—百分表;7—PP-ECC梁顶面.

    Figure 5.  Strain gauge layout

    图 6  跨中荷载位移曲线

    Figure 6.  Mid-span load displacement curve

    图 7  裂缝分布

    Figure 7.  Crack distribution

    图 8  梁截面混凝土应变分布

    Figure 8.  Concrete strain distribution of beam section

    图 9  冻融过程中PP-ECC的极限压缩性能变化

    Figure 9.  Changes in ultimate compression performance of PP-ECC during freeze-thaw process

    图 10  冻融过程中PP-ECC的拉伸性能变化

    Figure 10.  Changes in tensile properties of PP-ECC during freeze-thaw process

    图 11  抗弯承载力

    Figure 11.  Flexural bearing capacity

    表  1  PP-ECC梁具体试验参数

    Table  1.   Specific test parameters of PP-ECC beam

    试验梁
    分组
    试件编号冻融循环
    次数/次
    弯曲
    荷载/%
    抗弯性能
    试验
    第Ⅰ组E0-00
    第Ⅱ组E0-300300
    E0-500500
    第Ⅲ组E0.25-30030025
    E0.25-500500
    第Ⅳ组E0.5-30030050
    E0.5-500500
    下载: 导出CSV

    表  2  钢筋性能指标

    Table  2.   Rebar performance index

    型号直径/
    mm
    截面面
    积/mm2
    屈服强
    度/MPa
    极限强
    度/MPa
    弹性模
    量/GPa
    Q235628.26236390196
    HRB400628.26406576197
    HRB4001078.5411535203
    下载: 导出CSV

    表  3  PP-ECC梁的配合比

    Table  3.   Mix proportion of PP-ECC beam kg/m3

    水泥粉煤灰PP纤维
    82044218.2504.8
    下载: 导出CSV

    表  4  PP-ECC梁四点弯曲试验结果

    Table  4.   Four-point bending test results of PP-ECC beam

    试件编号屈服荷载/kN极限荷载/kN极限抗弯承载力/(kN·m)裂缝最大宽度/mm最终裂缝数量/条
    E0-033.9533.975.100.9036
    E0-30029.3428.844.331.1030
    E0-50024.8224.223.631.3425
    E0.25-30030.8830.724.611.2532
    E0.25-50024.6425.023.751.4229
    E0.5-30026.6726.013.901.5523
    E0.5-50021.2121.873.281.8018
    下载: 导出CSV

    表  5  PP-ECC材料本构参数

    Table  5.   Constitutive parameters of PP-ECC materials

    PP-ECC单轴拉伸本构参数 单轴受压本构参数
    σtc/MPaεtc/%σtu/MPaεtu/% σcu/MPaεcu/%
    0.860.0882.33 3.789 31.650.38
    下载: 导出CSV

    表  6  抗弯承载力对比

    Table  6.   Comparison of flexural bearing capacity

    冻融循环
    次数/次
    抗弯承载力计算值/
    试验值
    计算值/
    (kN·m)
    试验值/
    (kN·m)
    04.505.100.88
    3004.184.330.97
    5003.883.631.06
    下载: 导出CSV

    表  7  抗弯承载力对比

    Table  7.   Comparison of flexural bearing capacity

    冻融循环
    次数/次
    持荷比抗弯承载力计算值/
    试验值
    计算值/
    (kN·m)
    试验值/
    (kN·m)
    30004.184.330.97
    0.254.464.610.97
    0.503.753.900.96
    50003.883.631.07
    0.254.143.751.10
    0.503.483.281.06
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-09-27
  • 修回日期:  2023-02-10
  • 网络出版日期:  2023-12-05

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