冲击载荷下钢筋混凝土力学行为的研究

展婷变; 宁建国; 王志华

doi:10.11858/gywlxb.2016.02.004

冲击载荷下钢筋混凝土力学行为的研究

doi: 10.11858/gywlxb.2016.02.004

展婷变^{1, 3,},
宁建国¹,
王志华^2,*, ,

1.
北京理工大学爆炸科学与技术国家重点实验室，北京 10081
2.
太原理工大学材料强度和结构冲击山西重点实验室，山西太原 030024
3.
中北大学机电工程学院，山西太原 030051

基金项目:

国家自然科学基金重大项目 11390360

国家自然科学基金重大项目 11390362

详细信息

作者简介:
展婷变(1980—), 女，博士研究生，主要从事钢筋混凝土力学行为的研究.E-mail:zhantingbian@nuc.edu.cn

通讯作者:
王志华(1977—), 男，教授，主要从事钢筋混凝土力学行为的研究.E-mail:wangzhtyut@163.com

中图分类号: O347
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出版历程
- 收稿日期: 2015-11-10
- 修回日期: 2015-12-25

Mechanical Behavior of Reinforced Concrete under Dynamic Loading

ZHAN Ting-Bian^{1, 3
,},
NING Jian-Guo¹,
WANG Zhi-Hua^{2,*
, ,}

1.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2.
Shanxi Key Laboratory of Material Strength and Structure Impact, Taiyuan University of Technology, Taiyuan 030024, China
3.
College of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051, China

摘要

摘要: 基于钢筋混凝土梁受落锤冲击实验结果，提出了损伤型动态本构模型。该模型以混凝土黏弹性本构特性为基础，为了考虑钢筋的作用以及梁的损伤特性，将钢筋增强因子和损伤变量引入理论模型中，最终得出了以应变、应变率、损伤变量和配筋率为控制变量的钢筋混凝土本构模型。将该动态模型运用于非弹性弯曲梁理论分析中，通过数值求解得出了梁跨中挠度时程曲线，与实验结果相吻合。
- 钢筋混凝土 /
- 落锤冲击测试 /
- 损伤演化 /
- 动态本构模型 /
- 单自由度模型
Abstract: Based on the experimental results of a drop-weight impact test on reinforced concrete beams, the damage visco-elastic constitutive model has been proposed to describe the dynamic behavior of reinforced concrete. In view of the influence of the rebar and the damage characteristics of the beam, the reinforced multiplier and damage variable were introduced into the model to modify the constitutive model in such a way that it might be quantitatively described. Thus a constitutive model containing such control variables as strain, strain rate, damage and reinforcement ratio was obtained and then applied to the analysis of the fracture of the non-elastic bent beam. Numerical predictions were compared with the experimental deflection-time relationships, which shows a very good agreement with the experimental results.
- reinforced concrete /
- drop-weight impact test /
- constitutive model /
- single degree of freedom model /

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图 1 实验装置

Figure 1. Experimental setup

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图 2 RC梁的结构和尺寸

Figure 2. Beam details

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图 3 6-C40-8梁的高速摄影照片

Figure 3. High-speed photographs of 6-C40-8

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图 4 冲击力时程曲线

Figure 4. Time histories of impact load

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图 5 挠度时程曲线

Figure 5. Time histories of deflection

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图 6 应变时程曲线

Figure 6. Time histories of strain

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图 7 跨中挠度-时间的模型预测值与实验值对比

Figure 7. Comparison between predicted values and experimental data

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表 1 落锤冲击钢筋混凝土梁的动态响应值

Table 1. List of dynamic response values of beams

Specimen	Drop height/(m)	Velocity/(m/s)	Strain rate/(s^-1)	Max. impact load/(kN)	Max. deflection/(mm)	Res. deflection/(mm)
6-C40	5	9.90	2.05	202.20	62.65	53.83
6-C40	6	10.84	5.87	269.70	87.74	70.73
6-C40	7	11.71	9.54	230.71	119.07	106.54
6-C40	8	12.52	10.25	224.75	119.11	106.26
8-C40	2	6.26	0.25	151.73	22.94	14.12
8-C40	3	7.67	0.48	182.59	35.65	23.48
8-C40	4	8.85	0.74	203.26	35.90	25.71
8-C40	5	9.90	1.02	234.50	38.82	28.24

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表 2 模型参数

Table 2. Model parameters

E_c/(GPa)	υ_c	E_f/(GPa)	D₀	a	b	θ/(ms)
41	0.2	260	0.75	-1.10	0.65	0.53

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参考文献(11)

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