聚脲加固砖填充墙抗爆性能的试验和分析方法研究

许林峰; 陈力; 李展; 岳承军

doi:10.11883/bzycj-2021-0332

聚脲加固砖填充墙抗爆性能的试验和分析方法研究

doi: 10.11883/bzycj-2021-0332

许林峰^1,,
陈力^1, ,,
李展²,
岳承军¹

1.
东南大学爆炸安全防护教育部工程研究中心，江苏南京 211189
2.
陆军工程大学，江苏南京 210007

基金项目: 国家自然科学基金（51978166）；国家重点研发计划（2019YFC0706105）

详细信息

作者简介:
许林峰（1995－　），男，博士研究生，230199001@seu.edu.cn

通讯作者:
陈　力（1982－　），男，博士，教授，li.chen@seu.edu.cn

中图分类号: O383; O389
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- HTML全文浏览量: 308
- PDF下载量: 101
- 被引次数: 0
出版历程
- 收稿日期: 2021-08-09
- 修回日期: 2021-09-22
- 网络出版日期: 2022-06-17
- 刊出日期: 2022-07-25

Experimental and analytical study on blast resistance performance of brick infill walls strengthened with polyuria

XU Linfeng^1
,,
CHEN Li^{1
, ,},
LI Zhan²,
YUE Chengjun¹

1.
Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China
2.
Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

摘要

摘要: 为了掌握聚脲喷涂加固砖填充墙的抗爆特性，基于一种改进的大型爆炸试验装置，开展了聚脲加固框架砖填充墙的原型爆炸试验，分析了爆炸荷载作用下加固砖墙的动力响应特征和破坏过程及模式，揭示了其失效破坏机理。研究结果表明，聚脲加固可大幅提升填充墙构件的抗爆性能，显著增加填充墙构件的变形延性；加固砖墙受爆炸荷载作用发生振动的过程其体系刚度不断变化，最高相差133%；随着比例距离降低，加固砖墙的破坏模式逐渐由弯曲破坏转为剪切破坏，聚脲厚度超过6 mm可以有效限制局部剪切破坏现象；基于砖墙和聚脲涂层的抗力函数建立的理论计算模型，可以较为准确地预测爆炸作用下背爆面加固双向砖墙的正向位移响应过程。
- 聚脲 /
- 砖墙 /
- 抗爆试验 /
- 体系刚度 /
- 抗力函数
Abstract: In order to study the blast-resistance characteristics of polyurea sprayed reinforced brick infill walls, a prototype explosion test of polyurea sprayed reinforced frame infill walls was carried out based on an improved large-scale explosion test device. This test device eliminates the influence of the sparse wave formed by the air shock wave at the edge of the wall and the diffraction behind the wall on the real blast resistance test dynamic response of the wall, and significantly improves the accuracy of the blast resistance test of brick infill walls strengthened with polyuria. The dynamic response characteristics, failure process and mode of reinforced brick walls under explosion load were analyzed, and the failure mechanism was revealed. The results show that under small deformation conditions, polyurea reinforcement can improve the blast-resistance of infilled wall members. Under large deformation conditions, polyurea reinforcement can increase the ductility of filled wall members. The system stiffness of reinforced brick wall changes continuously during forced vibration, and the maximum difference is 133%. With the decrease of the proportional distance, the failure mode of the reinforced brick wall gradually changes from bending failure to shear failure. The polyurea thickness of more than 6 mm can effectively limit the local shear failure phenomenon. The theoretical calculation model based on the resistance function of brick wall and polyurea coating can accurately predict the forward displacement response process of two-way brick wall reinforced by back blasting surface under explosion.
- polyuria /
- brick wall /
- blast-resistance test /
- system stiffness /
- resistance function

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图 1 试验装置

Figure 1. Test device

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图 2 测试方案

Figure 2. Test scheme

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图 3 墙体试件破坏模式

Figure 3. Failure modes of wall specimens

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图 4 加固砖墙爆炸后背爆面涂层情况

Figure 4. Coatings of reinforcement brick wall after blasting

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图 5 试验荷载时程曲线

Figure 5. Curves of test load

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图 6 不同荷载作用下两种墙体的位移响应

Figure 6. Displacement responses of two walls under different loads

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图 7 背爆面加固作用机理

Figure 7. Mechanism of back burst surface strengthening

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图 8 不同振动位置砌块间受力

Figure 8. Force between blocks at different vibration positions

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图 9 试验现象^[19]

Figure 9. Test phenomena^[19]

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图 10 动载响应下聚脲涂层失效机理

Figure 10. Failure mechanism of polyurea coating under dynamic load response

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图 11 墙体结构弯曲变形示意

Figure 11. Deformation schematic of wall structure

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图 12 计算结果对比

Figure 12. Comparison of calculation results

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表 1 砖和砂浆的力学参数

Table 1. Material parameters of brick and mortar

材料密度/(kg·m⁻³) 杨氏模量/MPa 泊松比抗拉强度/MPa 剪切强度/MPa 屈服强度/MPa

砖 1200 897 0.15 5.5 5.5 14.1
砂浆 2100 913 0.25 3.5 3.5 7.03

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表 2 聚脲的力学参数

Table 2. Polyurea material parameters

密度/(kg·m⁻³) 杨氏模量/MPa 泊松比抗拉强度/MPa 屈服强度/MPa 切线模量/MPa 真实失效应变

1150 80 0.17 15 5.5 14.1 1.2

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表 3 试验工况

Table 3. Test conditions

试验聚脲厚度/mm 比例爆距/(m·kg^−1/3) 装药当量/kg

1 0 1.89 4
2 0 1.39 10
3 6 1.89 4
4 6 1.39 10

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表 4 爆炸荷载验证

Table 4. Explosion load verification

装药/kg 冲量/(Pa·s) 误差/%
测点P₁ 文献[17]方法

4 306 400 23.5
10 824 790 4.3

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表 5 砌体墙的破坏准则^[11]

Table 5. Failure criteria of masonry walls^[11]

破坏等级边界条件支座转角/(°) 跨中允许挠度/mm

可修复单向 0.5 8.72
双向 0.5 8.72
不可修复单向 1 17.45
双向 2 34.90

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表 6 本文与文献试验工况对比

Table 6. Comparison of test conditions between this paper and the literature

工况聚脲厚度/mm 装药/kg 比例爆距/(m·kg^−1/3)

1^[19] 0, 3 5 0.584
2^[19] 6, 6 5 0.35
本文试验3 0, 6 4 1.89
本文试验4 0, 6 10 1.39

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参考文献(25)

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材料	密度/(kg·m⁻³)	杨氏模量/MPa	泊松比	抗拉强度/MPa	剪切强度/MPa	屈服强度/MPa
砖	1200	897	0.15	5.5	5.5	14.1
砂浆	2100	913	0.25	3.5	3.5	7.03

试验	聚脲厚度/mm	比例爆距/(m·kg^−1/3)	装药当量/kg
1	0	1.89	4
2	0	1.39	10
3	6	1.89	4
4	6	1.39	10

装药/kg	冲量/(Pa·s)		误差/%
装药/kg	测点P₁	文献[17]方法	误差/%
4	306	400	23.5
10	824	790	4.3

破坏等级	边界条件	支座转角/(°)	跨中允许挠度/mm
可修复	单向	0.5	8.72
可修复	双向	0.5	8.72
不可修复	单向	1	17.45
不可修复	双向	2	34.90

工况	聚脲厚度/mm	装药/kg	比例爆距/(m·kg^−1/3)
1^[19]	0, 3	5	0.584
2^[19]	6, 6	5	0.35
本文试验3	0, 6	4	1.89
本文试验4	0, 6	10	1.39

聚脲加固砖填充墙抗爆性能的试验和分析方法研究

doi: 10.11883/bzycj-2021-0332

作者简介: 许林峰（1995－ ），男，博士研究生，230199001@seu.edu.cn

通讯作者: 陈 力（1982－ ），男，博士，教授，li.chen@seu.edu.cn

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出版历程

Experimental and analytical study on blast resistance performance of brick infill walls strengthened with polyuria

计量

出版历程

目录

作者简介:
许林峰（1995－　），男，博士研究生，230199001@seu.edu.cn

通讯作者:
陈　力（1982－　），男，博士，教授，li.chen@seu.edu.cn