UHPC-NC植筋界面抗剪性能

doi:10.13229/j.cnki.jdxbgxb.20240286

摘要/Abstract

摘要：

为研究超高性能混凝土（UHPC）与普通混凝土（NC）植筋界面的抗剪性能，通过Z型直剪试验探究了不同基体混凝土强度、界面植筋率以及钢筋在UHPC侧埋深对界面抗剪强度的影响，建立了UHPC-NC植筋界面抗剪承载力计算公式。结果表明：基体混凝土强度等级为C30、C40时，界面植筋率建议为1.22%，基体混凝土强度等级为C50时，界面植筋率建议为1.59%；为保证界面抗剪性能，钢筋在UHPC侧的埋深应大于8D；最后，提出了UHPC-NC植筋界面抗剪承载力的计算公式。

关键词: 结构工程, 超高性能混凝土, Z型直剪试验, 植筋, 界面抗剪承载力

Abstract:

In order to study the shear resistance of the interface between ultra-high performance concrete （UHPC） and normal concrete （NC）， the effects of different matrix concrete strength， interface reinforcement planting rate and reinforcement buried depth on the shear strength of the interface were investigated through Z-type direct shear test， and the calculation formula of shear bearing capacity of uhpc-nc reinforcement planting interface was established the results show that when the strength grade of the matrix concrete is C30 and C40， the interface planting rate is recommended to be 1.22%， and when the strength grade of the matrix concrete is C50， the interface planting rate is recommended to be 1.59%. In order to ensure the shear resistance of the interface， the buried depth of the reinforcement on the UHPC side should be greater than 8D. Finally， the formula for calculating the shear bearing capacity of UHPC-NC planting reinforcement interface was proposed.

Key words: structural engineering, ultra-high performance concrete, Z-type direct shear test, planted bar, interface shear capaci

中图分类号:

TU528.572

何化南,吴奇泽,张潇,孙松,李兵,张轩祎. UHPC-NC植筋界面抗剪性能[J]. 吉林大学学报(工学版), 2025, 55(12): 3976-3985.

Hua-nan HE,Qi-ze WU,Xiao ZHANG,Song SUN,Bing LI,Xuan-yi ZHANG. Shear resistance of UHPC⁃NC planting bar interface[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(12): 3976-3985.

图/表 14

表1

表2

图1

图2

表3

试验强度"

实验样品	$P u$ /kN	$S u$ /mm	τ/MPa
C30-8-6D	139.0	0.49	2.75
C30-10-6D	175.0	0.55	3.46
C30-12-6D	210.0	0.75	4.15
C30-14-6D	248.0	0.79	4.90
C30-16-6D	313.0	1.02	6.18
C40（对照组）	101.0	0.30	1.99
C40-8-6D	153.0	1.10	3.02
C40-10-6D	192.0	1.18	3.79
C40-12-6D	243.0	1.37	4.80
C40-14-6D	284.0	1.47	5.61
C50-8-6D	169.0	0.60	3.34
C50-10-6D	207.5	1.12	4.10
C50-12-6D	258.0	1.32	5.10
C50-14-6D	309.0	1.70	6.10
C50-16-6D	412.0	2.00	8.14
C40-10-2D	148.5	0.24	2.93
C40-10-4D	160.0	1.14	3.16
C40-10-6D	192.0	1.60	3.79
C40-10-8D	218.0	2.84	4.31
C40-10-10D	260.0	2.84	5.14

表3

图3

图4

图5

图6

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图8

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图11

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分组	钢筋直径D/mm	在NC中的埋深/mm	在UHPC中的埋深h_ef/mm
1~3	8、10、12、14、16	100	6D
4	10	100	2D、4D、6D、8D、10D