高温后钢管活性粉末混凝土的动态力学性能

姜猛; 郭志昆; 陈万祥; 邹慧辉; 梁文光

doi:10.11883/1001-1455(2017)03-0405-10

高温后钢管活性粉末混凝土的动态力学性能

doi: 10.11883/1001-1455(2017)03-0405-10

解放军理工大学爆炸冲击防灾减灾国家重点实验室, 江苏南京 210007

基金项目:

国家自然科学基金项目 51378498

国家自然科学基金项目 51578541

江苏省自然科学基金项目 BK20141066

详细信息

作者简介:
姜猛(1989—)，男，硕士研究生

通讯作者:
陈万祥, cwx_0806@sohu.com

中图分类号: O381;TU398
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- 被引次数: 9
出版历程
- 收稿日期: 2015-10-12
- 修回日期: 2016-01-08
- 刊出日期: 2017-05-25

Mechanical properties of reactive powder concrete-filled steel tube after exposure to high temperature under impact loading

State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, PLA University of Science and Technology, Nanjing 210007, Jiangsu, China

摘要

摘要: 采用霍普金森压杆装置对高温后钢管活性粉末混凝土(reactive powder concrete-filled steel tube，RPC-FST)进行冲击压缩实验，分析了应变率效应及温度效应对试件动态力学性能的影响。结果表明：高温(200、300 ℃)后RPC-FST仍具有较好的抗冲击能力、延性和完整性；冲击荷载作用下，RPC-FST的应变率效应明显弱于RPC的应变率效应；随着过火温度的提高，RPC-FST的峰值应力逐渐增大，变形能力增强，抗冲击能力提高。动力提高系数随过火温度的提高而增大，说明高温后RPC-FST的应变率效应更显著。
- 钢管活性粉末混凝土 /
- 霍普金森杆 /
- 动态力学性能 /
- 破坏形态
Abstract: Experiments on reactive powder concrete-filled steel tube (RPC-FST) specimens after exposure to high temperature were performed by using a split Hopkinson pressure bar (SHPB) apparatus, and the influences of strain rate effects and temperature effects on the dynamic behaviors of RPC-FST were investigated. Test results show that the RPC-FST specimens after exposure to high temperature have excellent impact-resistance, ductility and integrity. The strain rate effects of the RPC-FST specimens are weaker than those of the RPC specimens under impact loading. The peak stress of the RPC-FST specimens increases as the temperature increases, and the deformation capability and impact-resistance increase. The dynamic increase factor (DIF) increases as the temperature increases. It means that the strain rate effects of RPC-FST become more obvious after exposure to high temperature.
- reactive powder concrete-filled steel tube (RPC-FST) /
- Hopkinson pressure bar /
- dynamic behavior /
- failure mode

HTML全文

图 1 SHPB实验装置

Figure 1. SHPB test setup

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图 2 应变信号波形曲线

Figure 2. Strain signals

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图 3 平均应变率取值

Figure 3. Determination of average strain rate

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图 4 动态应力平衡

Figure 4. Dynamic stress balance

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图 5 试件升温拟合曲线

Figure 5. Fitting curves for elevated temperature

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图 6 试件温度分布

Figure 6. Temperature fields for RPC-FST specimens

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图 7 不同应变率下应力-应变曲线

Figure 7. Stress-strain curves at different strain rates

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图 8 峰值应力-应变率关系

Figure 8. Peak stress-strain rate curves

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图 9 RPC-FST破坏形态

Figure 9. Failure modes of RPC-FST under impact loading

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图 10 RPC破坏形态

Figure 10. Failure modes of RPC under impact loading

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图 11 峰值应力-温度曲线

Figure 11. Peak stress-temperature curves

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图 12 不同温度下应力-应变曲线

Figure 12. Stress-strain curves at different temperatures

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图 13 不同温度后动力增大系数与应变率的关系

Figure 13. Variations of dynamic increase factors versus strain rates

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表 1 RPC-FST冲击实验结果

Table 1. Experimental results of RPC-FST specimens under impact loading

编号	θ_max/℃	p₀/MPa	v₀/(m·s^-1)	σ_p/MPa	σ_p/MPa	${\mathit{\bar{\dot{\varepsilon }}}}$ /s^-1	λ_di
s0b	20	0.8	12.1	218~227	223	95	1.31
s0c	20	1.0	14.3	242~250	247	122	1.45
s1b	200	0.8	12.3	235~240	237	100	1.56
s1c	200	1.0	14.0	249~255	252	122	1.66
s2b	300	0.8	12.2	245~250	247	100	1.64
s2c	300	1.0	14.1	265~272	268	121	1.77

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表 2 RPC冲击实验结果

Table 2. Experimental results of RPC specimens under impact loading

编号	θ_max/℃	p₀/MPa	v₀/(m·s^-1)	σ_p/MPa	σ_p/MPa	${\mathit{\bar{\dot{\varepsilon }}}}$ /s^-1	λ_di
s0b	20	0.8	12.0	192~200	195	107	1.63
s0c	20	1.0	14.1	211~220	215	116	1.79
s1b	200	0.8	12.1	204~207	206	100	2.17
s1c	200	1.0	14.2	219~224	221	125	2.33
s2b	300	0.8	12.0	205~214	209	90	2.22
s2c	300	1.0	14.2	231~241	237	120	2.52

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表 3 动力提高系数的理论值与实验值的对比

Table 3. Comparisons of experimental and analytical dynamic increase factors

编号	θ_max/℃	p₀/MPa	平均应变率/s^-1	动力提高系数
编号	θ_max/℃	p₀/MPa	平均应变率/s^-1	实验值	理论值	相对误差/%
s0b	20	0.8	95	1.31	1.30	-0.9
s0c	20	1.0	122	1.45	1.36	-6.1
s1b	200	0.8	100	1.56	1.74	11.4
s1c	200	1.0	120	1.66	1.80	8.3
s2b	300	0.8	100	1.64	1.75	6.9
s2c	300	1.0	121	1.77	1.81	1.9

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