Effect of shear key arrangement on the bonding properties of prefabricated UHPC-NC interface
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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。
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关键词:
- 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. -
表 1 UHPC-NC试件设计
Table 1. UHPC-NC Specimen design
Specimen number Perimeter diameter of
the shear nail/mmShear nail
height/mmNumber of shear
nails/ pieceShear nail
densityN0 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. 表 2 试验结果
Table 2. Experimental results
Specimen number Ultimate load Pu/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 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 表 4 试验结果
Table 4. Experimental results
Specimen number Test values
τu/MPaEurocode 2
τ1/MPaACI 318M-05
τ2/MPaAASHTO LRFD
τ3/MPaGB 50010-2010
τ4/MPaτu/τ1 τu/τ2 τu/τ3 τu/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: τu 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. 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 numberCalculated value/MPa
(Test value/Calculated value)Literature [21]
specimen numberCalculated 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) — — 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 numberCalculated value/MPa
(Test value/Calculated value)Literature [21]
specimen numberCalculated 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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