钢筋混凝土排架结构的抗爆破坏等级

张帝; 杨军; 曾丹; 陈泰年; 高金明; 汤宇

doi:10.11883/bzycj-2020-0012

钢筋混凝土排架结构的抗爆破坏等级

doi: 10.11883/bzycj-2020-0012

张帝^1,,
杨军^1, ,,
曾丹²,
陈泰年²,
高金明²,
汤宇¹

1.
北京理工大学爆炸科学与技术国家重点实验室，北京 100081
2.
中国兵器工业火炸药工程与安全技术研究院，北京 100053

详细信息

作者简介:
张　帝（1991－　），男，博士研究生，dizhang@bit.edu.cn

通讯作者:
杨　军（1960－　），男，博士，教授， yangj@bit.edu.cn

中图分类号: O383; TU279
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出版历程
- 收稿日期: 2020-01-07
- 修回日期: 2020-05-21
- 刊出日期: 2020-12-05

Damage grades of reinforced concrete bent structures against blast

1.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2.
China Ordnance Engineering and Safety Technology Research Institute, Beijing 100053, China

摘要

摘要: 为了研究钢筋混凝土排架结构在大当量爆炸冲击波下的破坏规律，依据最大TNT当量为3 t的爆炸试验，对排架主体结构的抗爆破坏等级进行数值模拟研究。通过量纲分析得到1/2缩比模型的荷载参数和结构尺寸。基于Abaqus有限元软件，利用CONWEP方法实现爆炸加载，分别计算装药0.5 t爆距33 m和装药3 t爆距33 m两种工况下排架结构的破坏形态，并与试验结果进行对比。进一步通过控制药量和距离，计算不同超压和冲量下缩比模型的破坏形态。研究结果表明，排架的关键破坏特征为中间承重柱的倾覆转动；数值计算与试验破坏形态吻合较好，特征位移和特征转角的最大相对误差分别为5.6%和4.6%。以承重柱的倾覆角作为划分依据，将计算结果分为3种破坏等级，拟合得到的超压-冲量曲线和药量-距离曲线可用于厂房安全距离和仓库容量设计以及意外爆炸下的破坏程度预估。
- 钢筋混凝土排架 /
- 爆炸 /
- 破坏等级 /
- 超压-冲量曲线 /
- 缩比模型 /
- CONWEP
Abstract: To study the failure law of reinforced concrete bent structures under large equivalent explosions, the damage grades of the bent structures against blast were numerically calculated based on the explosion test with the maximum equivalent of 3 t TNT. The load parameters and structural dimensions of the 1/2 scaled model were obtained through dimensional analysis. Based on the Abaqus finite element software, the CONWEP method was used to achieve the blast loading. The failure modes of the structures, under the explosion loads with TNT equivalent 0.5 t and blast distance 33 m as well as TNT equivalent 3 t and blast distance 33 m, were calculated, respectively, and compared with the test results. Further, the failure patterns of the scale model under different overpressures and impulses were calculated by controlling the TNT equivalent and blast distance. The research results show that the middle column of the bent structure is prone to damage in the form of overall overturning under a lateral blast load; the calculated failure morphologies are in good agreement with the experimental ones, and the maximum relative errors of the characteristic displacements and characteristic corners are 5.6% and 4.6%, respectively. The overturning angle of the load-bearing column was used as the basis for the damage-grade division, and the calculated results were divided into three damage levels. The fitted overpressure-impulse and equivalent-distance curves can be used in the design of safety distance and warehouse capacity and the estimation of the damage degree of accidental explosion.
- reinforced concrete bent structure /
- blast /
- damage grade /
- overpressure-impulse curve /
- scaled model /
- CONWEP

HTML全文

图 1 钢筋混凝土排架缩比模型

Figure 1. The scaled model for the reinforced concrete bent structure

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图 2 屋架

Figure 2. Roof frame

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图 3 钢筋混凝土梁柱

Figure 3. Reinforced concrete column and beam

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图 4 立柱基础及周围土的几何参数

Figure 4. Dimensions of column foundation and surrounding soil

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图 5 CONWEP爆炸加载示意图

Figure 5. Schematic blast load in CONWEP

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图 6 CONWEP加载超压时程曲线

Figure 6. Overpressure-time curves calculated by CONWEP

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图 7 CONWEP加载冲量时程曲线

Figure 7. Impulse-time curves calculated by CONWEP

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图 8 试验系统布置

Figure 8. Test system arrangement

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图 9 缩比试验宏观破坏形态

Figure 9. Macroscopic destruction in scaled tests

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图 10 迎爆面中间立柱1 m高处的位移时程曲线（0.5 t-33 m）

Figure 10. Displacement-time curves at the height of 1 m of the middle column on the blasting face (0.5 t-33 m)

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图 11 试验与模拟宏观破坏对比

Figure 11. Comparison of macroscopic destructions between test and simulation

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图 12 试验与模拟局部破坏对比

Figure 12. Comparison of local destructions between test and simulation

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图 13 试验与模拟立柱转角对比

Figure 13. Comparison of rotation angles of columns between test and simulation

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图 14 破坏过程

Figure 14. Destruction process

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图 15 钢筋混凝土排架主体结构的破坏等级划分p-I曲线

Figure 15. p-I curves of damage grades division for the reinforced concrete bent main structure

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图 16 钢筋混凝土排架主体结构的破坏等级划分Q-R曲线

Figure 16. Q-R curves of damage grades division for the reinforced concrete bent main structure

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表 1 Q235B钢的弹塑性参数

Table 1. Elastoplastic parameters of steel Q235B

ρ/(kg·m⁻³)	E/GPa	μ	A/MPa	B/MPa	n	m	C	$ {\dot{\mathrm{\varepsilon }}}_{0} $/s⁻¹
7835.5	200.6	0.259	314	527.5	0.436	0.757	0.02	0.001

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表 2 HRB400钢的弹塑性参数

Table 2. Elastoplastic parameters of steel HRB400

ρ/(kg·m⁻³)	E/GPa	μ	A/MPa	B/MPa	n	m	C	$ {\dot{\mathrm{\varepsilon }}}_{0} $/s⁻¹
7766	200.5	0.241	476.2	719.8	0.44	0.757	0.014	0.001

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