重组竹-混凝土界面粘结-滑移本构模型

刘明西; 刘承阳; 刘问; 徐锋; 李智

doi:10.13801/j.cnki.fhclxb.20210804.002

重组竹-混凝土界面粘结-滑移本构模型

doi: 10.13801/j.cnki.fhclxb.20210804.002

刘明西¹,
刘承阳¹,
刘问^1, ,,
徐锋²,
李智³

1.
北京林业大学　水土保持学院，北京 100083
2.
南京工业大学　土木工程学院，南京 211800
3.
浙江大学　建筑工程学院，杭州 310058

基金项目: 国家重点研发计划(2019YFD1101002)

详细信息

通讯作者:
刘问，博士，副教授，硕士生导师，研究方向为断裂力学、竹木结构　E-mail：liuwen@bjfu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2021-05-09
- 修回日期: 2021-07-25
- 录用日期: 2021-07-28
- 网络出版日期: 2021-08-05
- 刊出日期: 2022-03-23

Bond-slip constitutive model of bamboo scrimber-concrete interface

1.
School of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China
2.
College of Civil Engineering, Nanjing Tech University, Nanjing 211800, China
3.
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

摘要

摘要: 为研究胶粘剂连接的重组竹-混凝土界面粘结性能及构建粘结-滑移本构模型，对44个重组竹-混凝土粘结试件进行单剪试验，并考虑了粘结长度、重组竹粘结宽度与厚度、混凝土强度及胶层厚度等因素对粘结性能的影响。研究结果表明：在不同影响因素下，试件破坏模式基本相同，均为混凝土表面发生剥离破坏，粘结界面间裂缝从加载端产生并向自由端发展，破坏过程分为弹性阶段、软化阶段和脱粘平台阶段；界面峰值剪应力随重组竹厚度、混凝土强度、胶层厚度增加而增大，随粘结宽度增加而减小。根据试验粘结-滑移曲线，建立了重组竹-混凝土界面粘结-滑移本构模型，与实验结果进行对比，该模型能较好地反映重组竹-混凝土界面剪应力与滑移量间的关系。
- 重组竹-混凝土 /
- 界面单剪试验 /
- 粘结性能 /
- 剥离破坏 /
- 粘结-滑移本构模型
Abstract: In order to study the bonding performance of bamboo scrimber-concrete interface connected by adhesive and construct bond-slip constitutive model, single shear tests were carried out on 44 bamboo scrimber-concrete bonding specimens. Plus, the effects of bond lengths, widths and thicknesses of bamboo scrimber, concrete strengths, and adhesive layer thicknesses on the shear performances of bond interfaces were also taken into consideration. The results of the study show that the failure modes of the specimens are almost the same under different influencing factors. That is, debonding failure occurs on the concrete surfaces, and the cracks between the bond interfaces develop from the loading stage to the free end. The failure process can be divided into elastic stage, softening stage and debonding platform stage. With the thickness of bamboo scrimber, the strength of concrete, and the thickness of glue layer increasing, the peak shear stress of the interface also increases; however, the peak shear stress decreases with the increase of the bonding width. According to the experimental bond-slip curve, a bond-slip constitutive model of bamboo scrimber-concrete interface was established. Compared with the experimental results, this model can better reflect the relationship between the shear stress and slippage of bamboo scrimber-concrete interface.
- bamboo scrimber-concrete /
- interface single shear test /
- bonding performance /
- debonding failure /
- bonding-slip constitutive model

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图 1 重组竹-混凝土单剪试件示意图(单位：mm)

Figure 1. Schematic diagram of bamboo scrimber-concrete single shear sample (Unit: mm)

b_c, t_c—Width and thickness of concrete; b_p, t_p—Width and thickness of bamboo scrimber; L—Bonding length; l—Unbonded length; l’—Length of the clamping end; P—Applied load

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图 2 控制胶层厚度

Figure 2. Control the thickness of adhesive layer

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图 3 单剪试验装置

Figure 3. Single shear test device

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图 4 重组竹-混凝土单剪试件破坏示意图

Figure 4. Failure diagram of bamboo scrimber-concrete single shear specimen

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图 5 不同重组竹-混凝土界面破坏形态

Figure 5. Failure modes of different bamboo scrimber-concrete interface

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图 6 不同重组竹-混凝土荷载-滑移曲线

Figure 6. Load-slip curves of different bamboo scrimber-concrete

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图 7 试件A30-80-30-5应变 (a) 和剪应力 (b) 分布规律

Figure 7. Strain (a) and shear stress (b) distribution of specimen A30-80-30-5

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图 8 试件A30-200-30-5应变 (a) 和剪应力 (b) 分布规律

Figure 8. Strain (a) and shear stress (b) distribution of specimen A30-200-30-5

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图 9 不同影响因素下重组竹-混凝土的粘结-滑移曲线

Figure 9. Bond-slip curves of bamboo scrimber-concrete under different influencing factors

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图 10 重组竹-混凝土峰值剪应力预测值与试验值对比

Figure 10. Comparison between predicted and experimental values of peak shear stress of bamboo scrimber-concrete

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图 11 重组竹-混凝土本构模型验证

Figure 11. Constitutive model verification of bamboo scrimber-concrete

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表 1 混凝土配合比

Table 1. Concrete mixture ratio

Grade	Cement/kg	Water/kg	Aggregate/kg	Sand/kg	f_cu/MPa
C30	388	225	1120	687	33.3
C40	385	180	1120	685	46.0
C50	537	205	1144	513	51.3
Note: f_cu—Cubic compressive strength of concrete.

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表 2 重组竹-混凝土单剪试件具体参数

Table 2. Specific parameters of bamboo scrimber-concrete single shear specimens

Specimen	f_cu/MPa	L/mm	b_p/mm	t_p/mm	t_a/mm
A30-80-30-5	33.3	80	30	5	0.9
A30-120-30-5	33.3	120	30	5	0.9
A30-160-20-5	33.3	160	20	5	0.9
A30-160-30-3	33.3	160	30	3	0.9
A30-160-30-5	33.3	160	30	5	0.9
A30-160-30-7	33.3	160	30	7	0.9
A30-160-38-5	33.3	160	38	5	0.9
A30-200-20-5	33.3	200	20	5	0.9
A30-200-30-3	33.3	200	30	3	0.9
A30-200-30-5	33.3	200	30	5	0.9
A30-200-30-7	33.3	200	30	7	0.9
A30-200-38-5	33.3	200	38	5	0.9
A40-200-30-5	46.0	200	30	5	0.9
A50-200-30-5	51.3	200	30	5	0.9
B30-200-30-5	33.3	200	30	5	2.2
C30-200-30-5	33.3	200	30	5	3.5
Notes: A, B, C—Thickness of adhesive layer of 0.9 mm, 2.2 mm, 3.5 mm, respectively; t_a—Thickness of adhesive layer.

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