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

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

彭培^1,,
李展^1, ,,
张亚栋²,
陈力²,
方秦¹

1.
陆军工程大学国防工程学院，江苏南京 210007
2.
东南大学教育部爆炸安全防护工程研究中心，江苏南京 211189

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
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- 被引次数: 0
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

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

PENG Pei^1
,,
LI Zhan^{1
, ,},
ZHANG Yadong²,
CHEN Li²,
FANG Qin¹

1.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University, Nanjing 210007, Jiangsu, China
2.
Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China

摘要

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。
- 燃气爆炸 /
- 蒸压加气混凝土 /
- 砌体墙 /
- 玄武岩纤维布 /
- 喷涂式聚脲
Abstract: Numerical studies were conducted by using the finite element software LS-DYNA to investigate the performances of the retrofitted autoclaved aerated concrete masonry (AAC) walls subjected to gas explosions. A simplified numerical model for the masonry walls was developed and calibrated with the test data. Under the blast loads specified by the design codes, the influences of wall height and thickness on the structural response of the unstrengthened one-way AAC masonry walls were discussed. In addition, the performances of the BFRP strip and spray-on polyurea strengthened one-way AAC masonry walls were compared and the retrofitting suggestions for engineering practice were proposed. It is found that the numerical predications of the mid-span displacements and failure modes are in agreement with the test data. Under the specified blast loads, the unstrengthened masonry walls mainly fail for bending of the structures, and with the increase of wall height, the failure mode changes from flexure failure to shear failure. Using the BFRP strips can improve the stiffness and arching effect of the walls significantly while the spray-on polyurea can enhance the tensile membrane effect of walls effectively. The failure mode of the strengthened masonry walls is a typical flexure failure. The fracture of the BFRP strips generally occurs at the mid-span area of the one-way masonry walls, while the fracture of spray-on polyurea occurs at the boundary of the masonry walls.
- gas explosion /
- autoclaved aerated concrete /
- masonry wall /
- BFRPstrip /
- spray-on polyurea

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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

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图 2 试验装置（背爆面加固）^[17]

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

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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)

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图 4 荷载超压时程曲线

Figure 4. Load overpressure-time curves

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图 5 墙体几何模型

Figure 5. Geometric models of AAC masonry walls

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图 6 简化模型的边界条件

Figure 6. Boundary conditions of simplified numerical model

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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

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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)

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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)

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图 10 规范建议的爆炸荷载

Figure 10. Blast load recommended by the design code

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图 11 砌体墙尺寸

Figure 11. Dimensions of masonry walls

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图 12 AAC单向砌体墙加固有限元模型

Figure 12. Strengthened AAC masonry wall models

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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

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图 14 不同高度砌体墙破坏模式

Figure 14. Failure modes of masonry walls with various heights

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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

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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

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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 2		12.50	聚乙烯厚膜	3.84
Test 3		12.50	4 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 5		12.50	4 mm玻璃	13.25
Test 6		9.50	聚乙烯薄膜	85.88	墙体倒塌
Test 7	BFRP加固墙W3^[17]	12.50	聚乙烯厚膜	2.96
Test 8		12.50	5 mm玻璃	21.26
Test 9		9.50	12 mm玻璃	43.17	墙体倒塌

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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	625	530	0.20	0.70	1	3	80	0.03

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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/%
BFRP	2 500	77.90	0.17	1 642	2.1

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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	1 150	80	0.17	8	1.20	6.45

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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
墙体高度/m	120 mm	240 mm	360 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

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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
加固材料	高度/m	120 mm	240 mm	360 mm
BFRP	3	0.48 mm（4层）	无需加固	无需加固
	4	0.36 mm（3层）	0.12 mm（1层）	无需加固
	5	0.36 mm（3层）	0.24 mm（2层）	无需加固
聚脲涂层	3	0.40 mm	无需加固	无需加固
	4	0.40 mm	0.10 mm	无需加固
	5	0.30 mm	0.10 mm	无需加固

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