剪力钉构造措施对UHPC模板-现浇NC界面黏结性能的影响

温小栋; 龚文波; 周明; 殷光吉; 邓泽玮

剪力钉构造措施对UHPC模板-现浇NC界面黏结性能的影响

宁波工程学院　建筑与交通工程学院, 宁波 315211

基金项目: 浙江省公益基金项目 (LGG21E080007)；宁波市自然科学基金项目(202003N4170)；宁波市科技创新重大专项(2023Z148)

详细信息

通讯作者:
周明，博士，副教授，硕士生导师，研究方向为组合结构、UHPC新型建材等　E-mail: zhouming1426@163.com

中图分类号: TU528
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- 被引次数: 0
出版历程
- 收稿日期: 2024-03-25
- 修回日期: 2024-05-16
- 录用日期: 2024-05-25
- 网络出版日期: 2024-06-18

Effect of shear key arrangement on the bonding properties of prefabricated UHPC-NC interface

School of Architecture and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China

Funds: the Basic Public Welfare Research Project of Zhejiang Province, China (LGG21E080007); the Ningbo Natural Science Foundation in China (202003N4170); the Major project of Science and Technology Innovation in Ningbo (2023Z148)

摘要

摘要: 为了研究预制超高性能混凝土UHPC与普通混凝土(NC)界面的黏结滑移性能，以预制UHPC表面剪力钉的密度和分布间距为试验参数，完成了12组UHPC-NC复合试件的双面剪切试验。结果表明，设置剪力钉构造措施的试件其破坏形态主要有3种，分别为(a) UHPC-NC黏结面与UHPC剪力钉均发生剪切破坏；(b) UHPC-NC黏结面剪切破坏、UHPC剪力钉同时发生剪切和剥离破坏；(c) UHPC-NC黏结面剪切破坏、NC基体轴压破坏。剪力钉密度与分布间距对UHPC-NC试件的黏结面抗剪强度有显著影响；尤其是剪力钉密度，黏结面抗剪强度随着剪力钉密度呈抛物线增长关系。在相同剪力钉密度下，剪力钉分布间距较大试件的黏结面抗剪强度比间距较小试件提高了19.04%~41.74%。基于现有模型及试验结果，建立了考虑黏结面破坏形态及抗剪试验方法的预制UHPC-NC黏结面抗剪强度的计算公式，其计算值与试验值吻合度较高，可为UHPC-NC复合试件的界面设计提供参考。
- UHPC-NC复合试件 /
- 抗剪强度 /
- 破坏形态 /
- 剪力钉密度 /
- 分布间距
Abstract: In order to study the bond-slip behavior of the interface between prefabricated ultra-high performance concrete (UHPC) and normal concrete (NC), 12 sets of UHPC-NC bond specimens were tested using double-sided shear tests with the density and spacing of shear studs on the prefabricated UHPC surface as the experimental parameters. The results show that, after the shear studs being installed on the formwork, there are three main failure modes of the specimens, namely (a) shear failure of UHPC-NC bond surface and UHPC shear studs; (b) shear failure of UHPC-NC bond surface and simultaneous shear and peeling failure of UHPC shear studs; and (c) shear failure of UHPC-NC bond surface and axial compression failure of NC matrix. The density and distribution interval of shear studs have a significant impact on the shear strength of UHPC-NC bond surface, especially the shear stud density. The shear strength on the bond surface increases parabolically with the density of shear studs. Under the same density of shear stud, the specimens with larger distribution interval of shear stud have a 19.04%-41.74% increase in shear strength on the bond surface, compared to the specimens with smaller distribution interval. On the basis of existing models and experimental results, a calculation formula for the shear strength of prefabricated UHPC-NC bond surface is established. It considers the failure modes of bond surface and the shear testing methods. The calculated results are in good agreement with the experimental values. This can provide a reference for the interface design of UHPC-NC composite specimens.
- UHPC-NC composite specimen /
- shear strength /
- failure models /
- shear stud density /
- distribution interval

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图 1 UHPC模板剪力钉构造方案

Figure 1. Construction scheme of shear nail for UHPC formwork

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图 2 UHPC-NC复合试件制作工艺流程图

Figure 2. Process flow diagram of UHPC-NC composite specimen production

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图 3 试验加载装置及加载示意图

Figure 3. Test loading device and loading schematic diagram

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图 4 UHPC-NC试件上应变片及位移计测点布置示意图(单位：mm)

Figure 4. Schematic diagram of the arrangement of strain gauges and displacement measurement points on the specimen (Unit: mm)

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图 5 UHPC-NC试件典型破坏形态

Figure 5. Typical failure mode of UHPC-NC specimens

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图 6 各级荷载作用下UHPC-NC试件的荷载-应变曲线

Figure 6. Load-strain curves of UHPC-NC specimens under loads at all levels

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图 7 试件N8 K的滑移曲线

Figure 7. Slip curve mode of N8 K sample

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图 8 不同参数下UHPC-NC试件的荷载-滑移演化规律

Figure 8. Slip evolution rule of UHPC-NC specimens under the influence of different parameters

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图 9 UHPC-NC剪应力-剪力钉密度ρ曲线

Figure 9. Shear stress-shear bond density ρ curve of UHPC-NC

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图 10 UHPC-NC黏结抗剪强度

Figure 10. Bonding shear strength of UHPC-NC

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表 1 UHPC-NC试件设计

Table 1. UHPC-NC Specimen design

Specimen number	Perimeter diameter of the shear nail/mm	Shear nail height/mm	Number of shear nails/ piece	Shear nail density
N0	0	0	0	0
N1	50	30	1	0.533
N2	50	30	2	1.067
N3	50	30	3	1.6
N4K	50	30	4	2.133
N6K	50	30	6	3.2
N8K	50	30	8	4.267
N12K	50	30	12	6.4
N18H	50	30	18	9.6
N4M	50	30	4	2.133
N4K	50	30	4	2.133
N8M	50	30	8	4.267
N8M	50	30	8	4.267
N12M	50	30	12	6.4
Note: In N1, N represents shear nails, and 1 represents the number of shear nails; K represents a large distribution interval of shear nails; M represents a small spacing between shear nails.

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表 2 试验结果

Table 2. Experimental results

Specimen number	Ultimate load P_u/kN	Shear stress/MPa	Failure mode
N0	100.2	1.67	Shear failure of the adhesive surface
N1	130.2	2.17	A
N2	149.4	2.49	A
N3	185.8	3.10	A
N4K	205.99	3.43	B
N6K	273.2	4.55	B
N8K	288	4.8	B
N12K	356.53	5.94	C
N18K	393.6	6.56	C
N4M	145.1	2.42	B
N8M	206	3.43	B
N12M	299.6	4.99	B

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表 3 单个剪力钉的黏结抗剪强度

Table 3. Shear strength of a single shear bond

Specimen number	Shear nail density	Shear stress/MPa	Shear stress after deduction/MPa	Shear strength of a single nail/MPa
N0	0	1.67	1.67	-
N1	0.53	2.17	0.55	0.55
N2	1.07	2.49	0.93	0.47
N3	1.6	3.10	1.59	0.53
N4K	2.13	3.43	1.98	0.50
N6K	3.20	4.55	3.21	0.54
N8K	4.27	4.8	3.57	0.45
N12K	6.40	5.94	4.93	0.41
N18K	9.60	6.56	5.87	0.33

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表 4 试验结果

Table 4. Experimental results

Specimen number	Test values τ_u/MPa	Eurocode 2 τ₁/MPa	ACI 318M-05 τ₂/MPa	AASHTO LRFD τ₃/MPa	GB 50010-2010 τ₄/MPa	τ_u/τ₁	τ_u/τ₂	τ_u/τ₃	τ_u/τ₄
N0	1.67	0.822	0.55	0.7	0.4	2.032	3.306	2.385	4.175
N1	2.17	1.057	0.55	0.7	0.4	2.053	3.945	3.1	5.425
N2	2.49	1.057	0.55	0.7	0.4	2.356	4.527	3.557	6.225
N3	3.10	1.057	0.55	0.7	0.4	2.933	5.636	4.429	7.75
N4K	3.43	1.057	0.55	0.7	0.4	3.245	6.236	4.9	8.575
N6K	4.55	1.057	0.55	0.7	0.4	4.305	8.273	6.5	11.375
N8K	4.8	1.057	0.55	0.7	0.4	4.541	8.727	6.857	12
N12K	5.94	1.057	0.55	0.7	0.4	5.620	10.8	8.486	14.85
N18K	6.56	1.057	0.55	0.7	0.4	6.206	11.927	9.371	16.4
N4M	2.42	1.057	0.55	0.7	0.4	2.289	4.4	3.457	6.05
N8M	3.43	1.057	0.55	0.7	0.4	3.245	6.236	4.9	8.575
N12M	4.99	1.057	0.55	0.7	0.4	4.721	9.073	7.129	12.475
Notes: τ_u is the test value of this article; τ₁ is the value according to the formula in the Eurocode 2 specification; τ₂ is the value according to the formula in ACI 318M-05 specification; τ₃ is the value according to the formula in AASHTO LRFD specification; τ₄ is the value according to the formula in GB 50010-2010 specification.

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表 5 UHPC-NC试件黏结面抗剪强度修正模型计算值与试验值(MPa)

Table 5. Calculated values of corrected model and experimental values for shear strength of UHPC-NC specimens (MPa)

Specimen number	Calculated value/MPa (Test value/Calculated value)	Literature [11] specimen number	Calculated value/MPa (Test value/Calculated value)	Literature [21] specimen number	Calculated value/MPa (Test value/Calculated value)
N0	1.589(1.051)	SB3	2.822(0.456)	ZJ-Z-1-1	2.622(0.793)
N1	2.111(1.028)	SB4	3.355(0.554)	ZJ-Z-1-2	3.645(0.850)
N2	2.606(0.955)	SB5	3.693(0.553)	ZJ-Z-1-3	4.467(0.698)
N3	3.070(1.010)	SC3	3.892(0.789)	ZJ-Z-2-2	3.645(0.859)
N4K	3.505(0.979)	SC4	4.626(0.618)	ZJ-Z-2-3	4.467(0.960)
N6K	4.289(1.061)	SC5	5.094(0.601)	—	—
N8K	4.956(0.969)	SD3	4.772(0.642)	—	—
N12K	5.940(1.000)	SD4	5.673(0.627)	—	—
N18K	6.544(1.002)	SD5	6.246(0.603)	—	—

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表 6 引入参数后UHPC-NC试件黏结面抗剪强度修正模型计算值与试验值(MPa)

Table 6. Calculated and experimental values of the modified model of shear strength of bonded surface of UHPC-NC specimens after the introduction of parameters (MPa)

Specimen number of this document	Calculated value/MPa (Test value/Calculated value)	Literature [11] specimen number	Calculated value/MPa (Test value/Calculated value)	Literature [21] specimen number	Calculated value/MPa (Test value/Calculated value)
N0	1.589(1.051)	SB3	1.648(0.781)	ZJ-Z-1-1	2.181(0.954)
N1	2.111(1.028)	SB4	1.959(0.948)	ZJ-Z-1-2	3.033(1.022)
N2	2.606(0.955)	SB5	2.157(0.946)	ZJ-Z-1-3	3.717(0.839)
N3	3.070(1.010)	SC3	2.273(1.068)	ZJ-Z-2-2	3.033(1.032)
N4K	3.505(0.979)	SC4	2.702(1.058)	ZJ-Z-2-3	3.717(1.154)
N6K	4.289(1.061)	SC5	2.975(1.028)	-	-
N8K	4.956(0.969)	SD3	2.787(1.100)	-	-
N12K	5.940(1.000)	SD4	3.313(1.074)	-	-
N18K	6.544(1.002)	SD5	3.648(1.033)	-	-

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