基于声发射技术的非标准自密实混凝土三点弯曲梁动态断裂特性

冯璐; 陈徐东; 张锦华; 袁佳怡; 程熙媛

doi:10.13801/j.cnki.fhclxb.20200608.001

基于声发射技术的非标准自密实混凝土三点弯曲梁动态断裂特性

doi: 10.13801/j.cnki.fhclxb.20200608.001

冯璐^1,,
陈徐东^{1, 2,},
张锦华^{3, 4, ,},
袁佳怡^1,,
程熙媛^1,

1.
河海大学　土木与交通学院，南京 210098
2.
东南大学　混凝土及预应力混凝土教育部重点实验室，南京 210096
3.
东南大学　爆炸安全防护教育部工程研究中心，南京 211189
4.
东南大学　土木工程学院，南京 211189

基金项目: 国家自然科学基金(51979090)；江苏省自然科学优秀青年基金(BK20190075)；中国科协青年人才托举项目(2017QNRC001)；中央高校基本科研业务费专项资金(B200202076)

详细信息

通讯作者:
张锦华，博士，副教授，研究方向为防灾减灾及防护工程　E-mail：zjh982038@163.com

中图分类号: TU528.01；TU398.9
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- 文章访问数: 1176
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-16
- 录用日期: 2020-05-30
- 网络出版日期: 2020-06-09
- 刊出日期: 2021-02-15

Dynamic fracture characteristics of non-standard three-point bending self-compacting concrete beams based on acoustic emission

FENG Lu^1
,,
CHEN Xudong^{1, 2
,},
ZHANG Jinhua^{3, 4
, ,},
YUAN Jiayi^1
,,
CHENG Xiyuan^1
,

1.
College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
2.
Key Laboratory of C&PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China
3.
Engineering Research Center of Explosion Safety Protection, Ministry of Education, Southeast University, Nanjing 211189, China
4.
School of Civil Engineering, Southeast University, Nanjing 211189, China

摘要

摘要: 对不同初始缝高比的自密实混凝土(Self-compacting concrete，SCC)非标准三点弯曲梁开展不同加载速率下的断裂试验，获得其断裂的荷载-裂缝嘴张开口位移曲线及峰值荷载、断裂韧度、临界缝高比增量、弹性模量和柔度系数等断裂参数，结合Pearson相关性检验公式及加载速率效应模型，定量分析初始缝高比、加载速率与断裂参数间的相关性强弱及SCC断裂参数的加载速率效应。结果表明峰值荷载、断裂韧度及弹性模量均存在一定的加载速率效应，柔度系数仅与初始缝高比强相关，弹性模量和断裂韧度是材料的固有属性，不受初始缝高比影响。同时，基于声发射(Acoustic emission，AE)技术对SCC的损伤断裂过程、断裂边界效应及裂缝扩展模式进行分析，结果表明，AE参量能较好地反映混凝土断裂的三阶段特性及边界效应。裂缝的扩展首先以拉伸裂缝为主，剪切裂缝占比随着裂缝扩展过程逐渐增大。
- 自密实混凝土 /
- 非标准三点弯曲梁 /
- 断裂试验 /
- 加载速率效应 /
- 声发射技术
Abstract: Fracture tests were carried out on non-standard three-point bending self-compacting concrete(SCC) beams with different initial crack-depth ratios under different loading rates. The fracture parameters such as load-crack mouth opening displacement curve, peak load, fracture toughness, critical crack-depth ratio increment, elastic modulus and flexibility coefficient were obtained. Based on Pearson correlation test formula and loading rate effect model, the correlation between initial crack-depth ratio, loading rate and fracture parameters and the loading rate effect of SCC fracture parameters were quantitatively analyzed. The results show that the peak load, fracture toughness and elastic modulus all have loading rate effect in a certain extent. The flexibility coefficient is only related to the initial crack-depth ratio. The elastic modulus and fracture toughness are inherent properties of the material and are not affected by the initial crack-depth ratio. Meanwhile, the damage and fracture process, fracture boundary effect and crack propagation pattern of the SCC were analyzed based on acoustic emission(AE) technology. The results show that the AE parameters can well reflect the three-stage characteristics and boundary effect of concrete fracture. The propagation of crack is mainly tensile crack at first, and the proportion of shear crack increases with the fracture propagation process.
- self-compacting concrete /
- non-standard three-point bending beams /
- fracture test /
- loading rate effect /
- acoustic emission technology

HTML全文

图 1 非标准SCC三点弯曲梁示意图

Figure 1. Schematic diagram of non-standard three-point bending SCC beam

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图 2 加载装置及声发射(AE)测点布置

Figure 2. Loading device and acoustic emission (AE) measuring point arrangement

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图 3 三种缝高比SCC梁不同加载速率下荷载-裂缝嘴张开口位移(P-CMOD)曲线

Figure 3. Load-crack mouth opening displacement (P-CMOD) curves of SCC beams of three crack-depth ratios under different loading rates

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图 4 不同加载速率下SCC梁峰值荷载与缝高比的关系

Figure 4. Relationships between peak loads P_maxand crack-depth ratios of SCC beams under different loading rates

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图 5 不同加载速率下SCC梁断裂韧度与缝高比的关系

Figure 5. Relationship between fracture toughness and crack-depth ratio of SCC beams under different loading rates

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图 6 不同缝高比SCC梁断裂韧度与加载速率的关系

Figure 6. Relationships between fracture toughnesses and loading rates of SCC beams of different crack-depth ratios

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图 7 不同加载速率下SCC梁临界缝高比增量Δa与缝高比的关系

Figure 7. Relationship between critical crack-depth ratio increment Δa and crack-depth ratio of SCC beams under different loading rates

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图 8 不同缝高比SCC梁临界缝高比增量Δa与加载速率的关系

Figure 8. Relationship between critical crack-depth ratio increment Δa and loading rate of SCC beams of different crack-depth ratios

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图 9 不同加载速率下SCC梁弹性模量与缝高比的关系

Figure 9. Relationship between elastic modulus and crack-depth ratio of SCC beams under different loading rates

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图 10 不同缝高比SCC梁弹性模量与加载速率的关系

Figure 10. Relationship between elastic modulus and loading rate of SCC beams of different crack-depth ratios

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图 11 不同加载速率下SCC梁柔度系数与缝高比的关系

Figure 11. Relationships between flexibility coefficients and crack-depth ratios of SCC beams under different loading rates

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图 12 不同缝高比SCC梁柔度系数与加载速率的关系

Figure 12. Relationships between flexibility coefficients and loading rates of SCC beams of different crack-depth ratios

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图 13 SCC梁动态弹性模量增长率

Figure 13. Growth rate of dynamic elastic modulus of SCC beams

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图 14 SCC梁动态断裂韧度增长率

Figure 14. Growth rate of dynamic fracture toughness of SCC beams

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图 15 不同缝高比SCC梁累计振铃计数和累计撞击次数

Figure 15. Accumulate counts and accumulative hits of SCC beams of different crack-depth ratios

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图 16 不同加载速率下不同缝高比SCC梁的平均频率(F_A)-上升时间与幅值的比值(R_A)

Figure 16. Average frequency (F_A)-ratio of the rise time to the amplitude (R_A) values of SCC beams of different crack-depth ratios under different loading rates

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表 1 自密实混凝土(SCC)配合比

Table 1. Mix proportion of self-compacting concrete (SCC) kg·m⁻³

Cement	Fly ash	Silica fume	Water	Superplasticizer	Sand	Stone
385	139	26	200	7.5	1018	800

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表 2 SCC梁初始缝高比、加载速率与不同断裂参数的相关性

Table 2. Correlation between the initial crack-depth ratio, loading rate and different fracture parameters of SCC beams

	Peak load	Flexibility coefficient	Elastic modulus	Critical crack-depth ratio	Fracture toughness
Initial crack-depth ratio	−0.995*	0.984*	0.443	−0.950*	0.861*
Loading rate	0.970*	−0.607*	0.926*	−0.406	0.885*
Note: *—Strong correlation between parameters.

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