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燃气爆炸作用下蒸压加气混凝土砌体墙的加固性能

彭培 李展 张亚栋 陈力 方秦

彭培, 李展, 张亚栋, 陈力, 方秦. 燃气爆炸作用下蒸压加气混凝土砌体墙的加固性能[J]. 爆炸与冲击, 2020, 40(3): 035101. doi: 10.11883/bzycj-2018-0252
引用本文: 彭培, 李展, 张亚栋, 陈力, 方秦. 燃气爆炸作用下蒸压加气混凝土砌体墙的加固性能[J]. 爆炸与冲击, 2020, 40(3): 035101. doi: 10.11883/bzycj-2018-0252
PENG Pei, LI Zhan, ZHANG Yadong, CHEN Li, FANG Qin. Performance of retrofitted autoclaved aerated concrete masonry walls subjected to gas explosions[J]. Explosion And Shock Waves, 2020, 40(3): 035101. doi: 10.11883/bzycj-2018-0252
Citation: PENG Pei, LI Zhan, ZHANG Yadong, CHEN Li, FANG Qin. Performance of retrofitted autoclaved aerated concrete masonry walls subjected to gas explosions[J]. Explosion And Shock Waves, 2020, 40(3): 035101. doi: 10.11883/bzycj-2018-0252

燃气爆炸作用下蒸压加气混凝土砌体墙的加固性能

doi: 10.11883/bzycj-2018-0252
基金项目: 国家重点基础研究发展计划(973计划)(2015CB058000);国家自然科学基金(51622812);江苏省自然科学基金(BK20190571)
详细信息
    作者简介:

    彭 培(1993- ),男,硕士研究生,961405626@qq.com

    通讯作者:

    李 展(1990- ),男,博士,讲师,lz.9008@163.com

  • 中图分类号: O381; TU362

Performance of retrofitted autoclaved aerated concrete masonry walls subjected to gas explosions

  • 摘要: 为研究燃气爆炸作用下蒸压加气混凝土砌体墙的加固性能,基于有限元软件LS-DYNA,建立了砌体墙简化数值模型,分析了GB 50779-2012 石油化工控制室抗爆设计规范中建议的荷载作用下砌体墙高度和厚度的影响,对比了玄武岩纤维(basalt fiber reinforced plastic, BFRP)布与喷涂式聚脲对蒸压加气混凝土单向砌体墙的加固效果,并以防止砌体墙倒塌为设计目标,给出了加固建议。研究表明,本文中建立的简化数值模型能较好地模拟燃气爆炸作用下蒸压加气混凝土砌体墙的变形和破坏模式,计算结果与试验吻合良好;《规范》建议荷载作用下,未加固砌体墙以弯曲破坏为主,随着墙体高度增加,破坏模式由弯曲破坏向剪切破坏转变;BFRP布条加固可以有效提高墙体抗弯刚度和压拱效应,而聚脲涂层加固对抗弯刚度提高有限但墙体拉拱效应明显,二者均能显著提高墙体抗爆性能;加固墙体均发生弯曲破坏,BFRP布条材料的断裂一般发生在墙体位移最大处,而聚脲涂层材料的断裂发生在跨端边界处。
  • 图  1  蒸压加气混凝土砌体墙试件

    Figure  1.  Test specimens for autoclaved aerated concrete (AAC) masonry wall

    图  2  试验装置(背爆面加固)[17]

    Figure  2.  Test setup (rear-face strengthened cases) [17]

    图  3  荷载超压及位移的测点布置(单位:mm)

    Figure  3.  Layout of measuring points for load overpressure and displacement (unit in mm)

    图  4  荷载超压时程曲线

    Figure  4.  Load overpressure-time curves

    图  5  墙体几何模型

    Figure  5.  Geometric models of AAC masonry walls

    图  6  简化模型的边界条件

    Figure  6.  Boundary conditions of simplified numerical model

    图  7  数值结果与试验数据的位移时程曲线对比

    Figure  7.  Comparison of mid-span displacements between numerical results and test data

    图  8  未加固单向砌体墙试验观察与数值预测破坏过程对比(工况3)

    Figure  8.  Comparison of failure process between numerical predictions and test observations (Test 3)

    图  9  BFRP加固砌体墙试验观察与数值预测破坏过程对比(工况9)

    Figure  9.  Comparison of failure process between numerical predictions and test observations (Test 9)

    图  10  规范建议的爆炸荷载

    Figure  10.  Blast load recommended by the design code

    图  11  砌体墙尺寸

    Figure  11.  Dimensions of masonry walls

    图  12  AAC单向砌体墙加固有限元模型

    Figure  12.  Strengthened AAC masonry wall models

    图  13  不同厚度的单向砌体墙最大变形时刻变形与破坏模式

    Figure  13.  Deformation and failure modes of masonry walls with different thicknesses at the maximum deflection moment

    图  14  不同高度砌体墙破坏模式

    Figure  14.  Failure modes of masonry walls with various heights

    图  15  BFRP加固墙体的变形与破坏模式

    Figure  15.  Deformation and failure modes of BFRP strip strengthened masonry walls

    图  16  聚脲涂层加固墙体的变形与破坏模式

    Figure  16.  Deformation and failure modes of spray-on ployurea strengthened masonry walls

    表  1  试验方案

    Table  1.   Testing scheme

    工况编号墙体类型甲烷体积分数/%窗口封闭物荷载峰值/kPa备注
    Test 1单向墙W1[16]12.50聚乙烯薄膜 0.74
    Test 212.50聚乙烯厚膜 3.84
    Test 312.504 mm玻璃 5.15墙体倒塌
    Test 4双向墙W2[16]12.50聚乙烯厚膜 2.91
    Test 512.504 mm玻璃13.25
    Test 6 9.50聚乙烯薄膜85.88墙体倒塌
    Test 7BFRP加固墙W3[17]12.50聚乙烯厚膜 2.96
    Test 812.505 mm玻璃21.26
    Test 9 9.5012 mm玻璃43.17墙体倒塌
    下载: 导出CSV

    表  2  AAC砌块的材料参数

    Table  2.   Material parameters of AAC blocks

    材料密度/(kg·m−3)杨氏模量/MPa泊松比μ拉伸极限/MPa剪切极限/MPa抗压强度/MPa断裂韧度/(N·m−1)剪力滞留系数
    砌块6255300.200.7013800.03
    下载: 导出CSV

    表  3  BFRP的材料参数[17]

    Table  3.   Material parameters of BFRP strips[17]

    材料密度/(kg·m−3)杨氏模量/GPa泊松比μ抗拉强度/MPa极限应变/%
    BFRP2 50077.900.171 6422.1
    下载: 导出CSV

    表  4  聚脲涂层的材料参数[24]

    Table  4.   Material parameters of spray-on polyurea[24]

    材料密度/(kg·m−3)杨氏模量/MPa泊松比μ屈服应力/MPa单元失效应变切线模量/MPa
    聚脲涂层1 150800.1781.206.45
    下载: 导出CSV

    表  5  不同高度、厚度条件下蒸压加气混凝土单向墙损伤情况

    Table  5.   Damage of one-way AAC masonry walls with different heights and thicknesses

    墙体高度/m不同厚度墙体损伤结果
    120 mm240 mm360 mm
    3倒塌不可修复可修复
    4倒塌倒塌不可修复
    5倒塌倒塌不可修复
    下载: 导出CSV

    表  6  不同墙体的加固方案

    Table  6.   Retrofitting suggestions for masonry walls

    加固材料高度/m不同厚度墙体的加固方案
    120 mm240 mm360 mm
    BFRP30.48 mm(4层)无需加固无需加固
    40.36 mm(3层)0.12 mm(1层)无需加固
    50.36 mm(3层)0.24 mm(2层)无需加固
    聚脲涂层30.40 mm无需加固无需加固
    40.40 mm0.10 mm无需加固
    50.30 mm0.10 mm无需加固
    下载: 导出CSV
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STRUCTURE AND INFRASTRUCTURE ENGINEERING
Study on internal rise law of fracture water pressure and progressive fracture mechanism of rock mass under blasting mpact
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
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出版历程
  • 收稿日期:  2018-07-10
  • 修回日期:  2019-11-03
  • 网络出版日期:  2020-02-25
  • 刊出日期:  2020-03-01

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