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矩形混凝土空心墩延性抗震性能试验研究

邵长江 漆启明 韦旺 肖正豪 何俊明 饶钢

邵长江, 漆启明, 韦旺, 肖正豪, 何俊明, 饶钢. 矩形混凝土空心墩延性抗震性能试验研究[J]. 西南交通大学学报, 2022, 57(1): 129-138, 157. doi: 10.3969/j.issn.0258-2724.20200092
引用本文: 邵长江, 漆启明, 韦旺, 肖正豪, 何俊明, 饶钢. 矩形混凝土空心墩延性抗震性能试验研究[J]. 西南交通大学学报, 2022, 57(1): 129-138, 157. doi: 10.3969/j.issn.0258-2724.20200092
SHAO Changjiang, QI Qiming, WEI Wang, XIAO Zhenghao, HE Junming, RAO Gang. Experimental Study on Ductile Seismic Performance of Rectangular Hollow Concrete Columns[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 129-138, 157. doi: 10.3969/j.issn.0258-2724.20200092
Citation: SHAO Changjiang, QI Qiming, WEI Wang, XIAO Zhenghao, HE Junming, RAO Gang. Experimental Study on Ductile Seismic Performance of Rectangular Hollow Concrete Columns[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 129-138, 157. doi: 10.3969/j.issn.0258-2724.20200092

矩形混凝土空心墩延性抗震性能试验研究

doi: 10.3969/j.issn.0258-2724.20200092
基金项目: 国家自然科学基金(51978581,51178395);四川省应用基础研究重点课题(2017JY0059)
详细信息
    作者简介:

    邵长江(1970—),男,副教授,博士, 研究方向为桥梁工程抗震, E-mail:shao_chj@126.com

  • 中图分类号: U448

Experimental Study on Ductile Seismic Performance of Rectangular Hollow Concrete Columns

  • 摘要:

    为深入认识混凝土空心墩地震损伤机理并评估其延性能力,对不同剪跨比、纵筋率及配箍率的方形和矩形空心墩试件开展拟静力加载试验. 观测各墩裂缝分布和损伤情况,分析桥墩的滞回性能、曲率及位移延性,并结合文献试验数据探讨既有塑性铰公式对空心墩顶部位移能力计算的适用性. 研究结果表明:各空心墩试件呈弯曲破坏特征,延性系数均在5.0以上,抗震性能良好;相同剪跨比下空心墩抗剪性能弱于相同外尺寸实心墩;增加纵向率能够适当提升空心墩侧向承载力和极限位移;在低轴压比下,纵筋率和箍筋用量对空心墩位移延性系数的影响规律不明显;空心墩塑性铰长度随剪跨比、纵筋强度或直径、轴压比的增加而提高,随混凝土强度的增加而降低,而配箍率的影响不显著;Mander、孙治国和JRA塑性铰模型预测值与试验值误差不超过5%,其中Mander公式计算效果最佳,可用于评估空心墩等效塑性铰长度;规范中较多采用的Paulay-Priestley模型高估了空心墩塑性铰长度,会使得桥墩抗震设计偏于不安全.

     

  • 图 1  桥墩尺寸及配筋

    Figure 1.  Size and bar arrangement of bridge piers

    图 2  试验装置和加载现场

    Figure 2.  Test setup and loading protocol

    图 3  D2墩底(W侧)裂缝发展过程

    Figure 3.  Crack evolution of specimen D2 at pier foot (W side)

    图 4  墩身典型裂缝分布

    Figure 4.  Typical crack distribution of specimens

    图 5  试件D1和D2滞回曲线

    Figure 5.  Hysteretic curves of specimens D1 and D2

    图 6  空心墩骨架曲线比较

    Figure 6.  Comparison of skeleton curves of hollow piers

    图 7  部分空心墩平均曲率分布

    Figure 7.  Average curvature distribution of some hollow piers

    图 8  各因素对空心墩位移延性系数的影响

    Figure 8.  The effects of influencing factors on the displacement ductility factor of hollow piers

    图 9  各因素对空心墩塑性铰长度的影响

    Figure 9.  The effects of influencing factors on the plastic hinge length of hollow piers

    图 10  空心墩塑性铰长度计算值与试验值的比较

    Figure 10.  Comparison between calculated and measured plastic hinge lengths for hollow columns

    表  1  桥墩模型设计参数

    Table  1.   Design parameters of pier samples

    桥墩类型试件
    名称
    L/mL/hρl/%纵筋布置ρs/%s/mm
    方形实心墩 A2 2.95 5.9 1.79 20ϕ16 + 4ϕ12 2.35 110
    方形空心墩 D1 1.95 3.9 2.12 20ϕ12 + 8ϕ16 2.24 90
    D2 2.95 5.9 2.12 20ϕ12 + 8ϕ16 2.24 90
    D3 3.95 7.9 2.12 20ϕ12 + 8ϕ16 2.24 90
    E1 2.95 5.9 2.12 20ϕ12 + 8ϕ16 3.10 65
    E2 2.95 5.9 2.12 20ϕ12 + 8ϕ16 1.34 150
    F1 2.95 5.9 1.87 16ϕ12 + 8ϕ16 2.24 90
    F2 2.95 5.9 2.81 24ϕ12 + 12ϕ16 2.24 90
    矩形空心墩 G1 1.95 3.9 2.15 20ϕ12 + 16ϕ16 2.13 100
    G2 2.95 5.9 2.15 20ϕ12 + 16ϕ16 2.13 100
    G3 3.95 7.9 2.15 20ϕ12 + 16ϕ16 2.13 100
    H1 2.95 5.9 2.15 20ϕ12 + 16ϕ16 3.04 70
    H2 2.95 5.9 2.15 20ϕ12 + 16ϕ16 1.42 150
    I1 2.95 5.9 1.63 26ϕ12 + 6ϕ16 2.13 100
    I2 2.95 5.9 2.69 32ϕ12 + 16ϕ16 2.13 100
    下载: 导出CSV

    表  2  延性系数和塑性铰长度实测值

    Table  2.   Measured ductility factors and plastic hinge length

    试件Δy /mmΦy/( × 10−3 m−1)Δu /mmΦu/m−1延性系数 μΔLp /mm
    D1 15.6 12.30 90.0 0.180 5.8 242.0
    D2 20.8 7.17 148.0 0.167 7.1 283.0
    D3 24.7 4.75 160.0 0.104 6.5 362.0
    E1 19.6 6.76 132.0 0.152 6.7 275.0
    E2 16.9 5.83 130.0 0.166 7.7 250.0
    F1 17.3 5.96 132.0 0.154 7.6 276.0
    F2 20.1 6.93 154.0 0.149 7.7 340.0
    G1 18.6 14.70 113.6 0.215 6.1 261.0
    G2 29.2 10.10 148.7 0.166 5.1 273.0
    G3 29.0 5.58 181.3 0.134 6.3 314.0
    H1 26.2 9.03 149.7 0.161 5.7 289.0
    H2 20.5 7.07 131.1 0.151 6.4 274.0
    I1 24.2 8.34 137.7 0.178 5.7 237.0
    I2 30.4 10.50 168.6 0.190 5.5 274.0
    下载: 导出CSV

    表  3  等效塑性铰计算模型

    Table  3.   Equivalent plastic hinge length models

    编号来源计算式
    M1 Mander[17] (1983年) $ {L_{\text{p}}} = 0.06L + 32\sqrt {{d_{\text{b}}}} $
    M2 Priestley-Park[16] (1987年) ${L_{\text{p}}} = 0.08L + 6{d_{\text{b}}}$
    M3 Paulay-Priestley[18] (1992年),
    Caltrans[19] (2006年)
    ${L_{\text{p}}} = 0.08L + 0.022{f_{\text{y}}}{d_{\text{b}}} \geqslant 0.044{f_{\text{y}}}{d_{\text{b}}}$
    M4 Watson-Park[20](1994年) ${L_{\rm{p} } } = h\left( {1 + 2.8\mathop P\nolimits_{\rm{u} } /\left( {{\varphi \mathop f\nolimits{'}}_{\rm{c} } {A_{\rm{g} } } } \right)} \right)$
    M5 Berry[21](2008年) ${L_p} = 0.05L + 0.1{ { {f_{\text{y} } }{d_{\text{b} } } } \mathord{\left/ {\vphantom { { {f_{\text{y} } }{d_{\text{b} } } } {\sqrt { { {f'}_{\text{c} } } } } } } \right. } {\sqrt { { {f}'_{\text{c} } } } } }$
    M6 孙治国[22] (2011年) $\begin{gathered} {L_{\rm{p} } }{ { = } }0.10L - 0.165h + 7.32{d_{\rm{b} } }, \quad 0.2h \leqslant {L_{\rm{p} } } \leqslant 0.7h \end{gathered}$
    M7 JRA[23] (2002年) $\begin{gathered} {L_{\rm{p} } } = 0.2L - 0.1h, \quad 0.1h \leqslant {L_{\rm{p} } } \leqslant 0.5h \end{gathered}$
    M8 Eurocode 8[24](2005年) ${L_{\text{p}}} = 0.1L + 0.015{f_{\text{y}}}{d_{\text{b}}}$
    M9 《细则》[2](2008年) $\begin{array}{l}{L_{ {\rm{p1} } } } = 0.08L + 0.022{f_{\rm{y} } }{d_{\rm{b} } } \geqslant 0.044{f_{\rm{y} } }{d_{\rm{b} } },\; {L_{ {\rm{p} }2} } = \dfrac{2}{3}h,\; {L_{\rm{p} } } = \min \left\{ { {L_{ {\rm{p} }1} },\; {L_{ {\rm{p} }2} }\left. {} \right\} } \right.\end{array}$
    下载: 导出CSV

    表  4  文献中试件参数及Lp

    Table  4.   Parameters and Lp of specimens in literature

    编号来源试件ρl
    /%
    fy
    /MPa
    ρs
    /%
    fc'
    /MPa
    ημΔLp/mm
    1 文献[17] A 1.55 335 2.0 30.0 0.10 8.0 278
    2 C 1.55 335 3.1 29.0 0.30 8.0 300
    3 D 1.55 335 2.0 29.0 0.30 6.0 308
    4 文献[25] NB4 2.13 460 30.1 0.09 6.3 328
    5 NA8 2.13 460 24.6 0.11 6.6 309
    6 NB8 2.13 460 24.6 0.11 6.3 175
    7 HA8 2.13 460 35.8 0.06 7.2 143
    8 HB8 2.13 460 35.8 0.06 7.1 151
    9 文献[9] No.2 1.92 330 1.91 34.0 0.08 8.9 232
    10 No.3 1.92 330 1.01 34.0 0.08 8.1 209
    11 文献[11] 405 1.93 374 1.08 43.5 0.10 5.9 177
    12 805 1.93 374 1.08 43.5 0.10 5.4 228
    13 文献[14] S13-NS 1.40 385 3.5 28.2 0.10 3.5 210
    14 S13-EW 1.40 385 3.5 28.2 0.10 5.5 260
    15 S14-NS 2.10 385 3.5 28.2 0.10 5.7 240
    16 S14-EW 2.10 385 3.5 28.2 0.10 5.2 190
    17 S15-NS 1.40 385 3.5 28.2 0.20 4.4 230
    18 S15-EW 1.40 385 3.5 28.2 0.20 3.8 260
    19 S16-NS 2.10 385 3.5 28.2 0.20 4.4 270
    20 S16-EW 2.10 385 3.5 28.2 0.20 3.8 210
    21 S17-NS 2.10 385 2.5 28.2 0.10 4.2 220
    22 S17-EW 2.10 385 2.5 28.2 0.10 3.7 250
    下载: 导出CSV
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  • 收稿日期:  2020-03-11
  • 录用日期:  2021-11-02
  • 修回日期:  2020-06-11
  • 网络出版日期:  2021-11-16
  • 刊出日期:  2020-06-18

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