应变率对光圆钢筋与混凝土“粘结-滑移”行为影响的实验研究

付应乾; 余效儒; 董新龙; 周风华; 李平

doi:10.11883/bzycj-2018-0513

应变率对光圆钢筋与混凝土“粘结-滑移”行为影响的实验研究

doi: 10.11883/bzycj-2018-0513

付应乾^{1, 2,},
余效儒²,
董新龙²,
周风华^2, ,,
李平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.
宁波大学冲击与安全工程教育部重点实验室，浙江宁波 315211

基金项目: 国家自然科学基金（11390361）

详细信息

作者简介:
付应乾（1986－　），男，博士研究生，526524376@qq.com

通讯作者:
周风华（1964－　），男，博士，教授，博导，zhoufenghua@nbu.edu.cn

中图分类号: O347
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- 被引次数: 0
出版历程
- 收稿日期: 2018-12-24
- 修回日期: 2019-01-22
- 网络出版日期: 2019-05-25
- 刊出日期: 2019-06-01

An experimental study of dynamic bond-slip behaviors of plain steel barsin concrete at different strain rates

FU Yingqian^{1, 2
,},
YU Xiaoru²,
DONG Xinlong²,
ZHOU Fenghua^{2
, ,},
LI Ping¹

1.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2.
MOE Key Laboratory of Impact and Safety Engineering, Ningbo University, Ningbo 315211, Zhejiang, China

摘要

摘要: 为研究应变率对钢筋与混凝土界面粘结性能的影响，利用高速拉伸试验机进行了光圆钢筋的动态拔出实验。通过合理设计加载夹具和测试方法，得到不同应变率下光圆钢筋的“粘结-滑移”全程曲线。实验结果表明：随着应变率的增大，钢筋-混凝土界面的粘结强度显著提高，且界面失效形式由拔出失效为主转变为混凝土试件的破裂破坏为主；粘结强度的动态增强因子（f _DIF）随应变率的增长斜率明显可以分为低应变率和高应变率两个区段。低应变率下，f_DIF增长较为缓慢；而高应变率下，f _DIF快速增长；转变应变率约为33 s⁻¹。
- 应变率 /
- 钢筋混凝土 /
- 动态粘结-滑移力学行为 /
- 粘结强度动态增强因子
Abstract: To investigate the effect of strain rate on the bond-slip behaviors of smooth steel bars in concrete, we conducted plain steel bar pullout tests from quasi-static to impact loading using a high-speed tensile test machine and obtained the whole bond-slip curves of the plane steel bar at different strain rate with reasonable designed stop devices and testing methods. The test results show that the bond strength increased obviously, and the failure mode transferred from pullout to splitting with the increase of the strain rate, that the dynamic increase factor（DIF） curve can be divided into two parts, those of the low and high strain rates, and that the DIF increased slowly with the increase of the strain rate at low strain rates, but increased sharply at high strain rates.
- strain rate /
- steel bar reinforced concrete /
- dynamic bond-slip behavior /
- dynamic increase factor（DIF） of pullout strength

HTML全文

图 1 典型的准静态粘结-滑移曲线^[11]

Figure 1. A typical quasi-static “bond-slip” curves

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图 2 高速拉伸试验机及其加载原理

Figure 2. High-speed tensile machine and its loading mechanism

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图 3 试件及拔出装置

Figure 3. Specimen and pullout loading device

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图 4 实验测量装置

Figure 4. Experimental devices

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图 5 采用不同方式测量得到的粘结力及相对滑移时间曲线（加载速度1 000 mm/s）

Figure 5. Measured history curves of bond force and relative slip (loading speed 1 000 mm/s)

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图 6 粘接力-滑移测试曲线的重复性检验（加载速度1 000 mm/s）

Figure 6. Three “bond-slip” curves for the case of loading speed 1 000 mm/s

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图 7 不同应变率下的典型粘结-滑移曲线

Figure 7. Typical bond-slip curves at different strain rate

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图 8 粘结强度动态增长因子（f_DIF）与应变率的关系

Figure 8. Relationship between f_DIF and loading strain rate

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图 9 滑移界面的混凝土和钢筋形貌

Figure 9. Morphology of concrete and rebar

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表 1 试验结果综合

Table 1. collection of the test results

加载速度/（mm·s⁻¹）	名义应变率/s⁻¹	编号	粘结强度/MPa	滑移应变ε_s /%	名义失效应变ε_f /%	破坏形态
0.03	0.001	01	8.85	0.88	10.95	拔出
		02	8.44	1.27	12.3	拔出
		03	10.9	0.95	11.2	拔出
0.30	0.010	01	9.59	0.88	14.2	拔出
		02	11.4	0.97	11.6	劈裂
		03	9.88	0.89	12.8	拔出
1.00	0.030	01	12.4	1.12	11.5	拔出
		02	10.9	0.80	13.6	拔出
		03	12.8	1.36	14.6	拔出
10.0	0.333	01	14.1	1.67	11.7	拔出
		02	14.9	1.35	12.1	劈裂
		03	11.2	2.03	15.4	拔出
100	3.333	01	11.2	3.41	14.7	拔出
		02	11.8	1.89	12.9	拔出
		03	10.4	1.33	16.8	拔出
1 000	33.33	01	14.8	1.85	23.2	拔出
		02	12.4	0.93	31.6	拔出
		03	12.2	2.18	30.9	拔出
3 000	100.0	01	19.0	2.91	−	劈裂
		02	21.2	2.07	−	劈裂
		03	19.9	1.91		劈裂
5 000	166.7	01	20.7	3.10	−	劈裂
		02	21.3	2.35	−	劈裂
		03	24.0	2.91	−	劈裂
10 000	333.3	01	26.3	3.33	−	劈裂
		02	23.2	4.26	−	劈裂
		03	26.8	2.79	−	劈裂

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