钢筋与粗骨料超高性能混凝土粘结性能试验研究

赵灿晖; 李浩稻; 邓开来

doi:10.3969/j.issn.0258-2724.20170513

钢筋与粗骨料超高性能混凝土粘结性能试验研究

doi: 10.3969/j.issn.0258-2724.20170513

基金项目: 国家自然科学基金项目（51708466，51178393）；中央高校基本科研业务费专项资金（2682017CX002）

详细信息

作者简介:
赵灿晖（1970—），男，教授，研究方向为组合结构桥梁及桥梁抗震，E-mail：zch2887@163.com

中图分类号: TU375
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- 被引次数: 0
出版历程
- 收稿日期: 2017-07-10
- 修回日期: 2018-03-02
- 网络出版日期: 2019-05-20
- 刊出日期: 2019-10-01

Experimental Study on Bonding Performance Between Rebar and Coarse Aggregate Ultra-High Performance Concrete

摘要

摘要: 为了研究含粗骨料超高性能混凝土（UHPC）与带肋钢筋的粘结性能，对6组钢筋-粗骨料UHPC中心拉拔试件进行了加载测试，研究了钢筋直径、保护层厚度、粘结锚固长度对粘结应力的影响，基于厚壁圆筒理论和拉梅解答分析了保护层厚度的影响. 采用回归分析的方法得到了极限粘结应力的计算公式，并采用其他文献的试验结果验证了该公式的有效性. 研究结果表明：粗骨料UHPC与钢筋的粘结锚固破坏模式与活性粉末混凝土（RPC）相似，有“刮犁破坏”和“劈裂破坏”两种模式；粗骨料UHPC所需钢筋的最小保护层厚度略大于RPC，粘结锚固长度与RPC相近；保护层厚度、粘结锚固长度存在相互影响，粘结锚固长度足够时可适当减小保护层厚度；提出了带肋钢筋在粗骨料UHPC中保护层厚度和锚固长度的建议值.
- 粗骨料超高性能混凝土（UHPC） /
- 粘结性能 /
- 破坏模式 /
- 粘结长度 /
- 保护层厚度
Abstract: To investigate the bonding performance between the reinforcement and coarse aggregate UHPC（ultra-high performance concrete）, six sets of pulling out specimens were tested. The effect of reinforcement diameter, cover layer thickness, and anchorage length were quantitatively studied, and further analysis based on the classic thick-cylinder theory and Lame Formula were conducted to obtain the influence of cover layer thickness. The formula for estimating the peak bonding stress was obtained through regression analysis, which was validated with the several physical tests. According to the results, the bonds between the reinforcement and coarse aggregate UHPC have similar failure modes with that of RPC（reactive powder concrete）, including " wipe failure” and " split failure”. The thickness of cover layer in coarse aggregate UHPC is a little larger than that in RPC, while the demand of anchorage length is almost the same. The cover layer thickness and anchorage length have interactive effect on each other, meaning that sufficient anchorage length can reduce the requirement of cover layer thickness. Finally, the suggested anchorage length is presented.
- coarse aggregate ultra-high performance concrete /
- bonding /
- failure modes /
- bonding length /
- thickness of cover layer

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图 1 试件构造

Figure 1. Structure of the specimen

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图 2 加载装置

Figure 2. Loading setup

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图 3 试件典型破坏模式

Figure 3. Typical failure modes of specimens

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图 4 保护层厚度的影响

Figure 4. Effect of the thickness of cover layer

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图 5 粘结锚固长度的影响

Figure 5. Effect of the bonding length

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图 6 钢筋凸助对周围UHPC的挤压作用

Figure 6. Compression stress from the rib of the reinforcement to the surrounding UHPC

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图 7 环向拉应力与相对保护层厚度的关系

Figure 7. Relationship between the thickness of the cover layer and hoop tensile stress

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图 8 极限粘结应力与相对保护层厚度的关系

Figure 8. Relationship between the thickness of the cover layer and peak bonding stress

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图 9 极限粘结应力与相对锚固长度的关系

Figure 9. Relationship between the thickness of the bonding length and peak bonding stress

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表 1 试验用粗骨料UHPC配合比

Table 1. Mix proportion of coarse aggressive UHPC

水泥	微硅粉	河砂	碎石	钢纤维	水	外加剂
786	136	901	410	210	159	18

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表 2 粗骨料UHPC力学性能指标

Table 2. Mechanical characteristics of coarse aggressive UHPC

类别	f_cu/MPa	f_t/MPa	E_c/GPa
粗骨料UHPC	177.1	13.8	59.9
RPC	168.6	14.6	47.6

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表 3 钢筋-UHPC中心拔出试件尺寸参数

Table 3. Parameters of specimens

试件编号	c	d	a	l
LB18-4d-15	15	18	39	72
LB18-4d-20	20	18	39	72
LB18-5d-20	20	18	30	90
LB20-5d-15	15	20	25	100
LB20-5d-20	20	20	25	100
LB20-6d-20	20	20	15	120
注：以LB18-4d-15为例说明试件编号规则，该试件标号表示：钢筋直径为18 mm，粘结锚固长度取4倍钢筋直径，保护层厚度为15 mm.

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表 4 粘结应力与钢筋应力

Table 4. Bonding stress and steel stress

试件编号	τ_cr	τ_u	σ_cr	σ_u	破坏模式
LB18-4d-15	26.37	30.70	421.9	491.2	劈裂破坏
LB18-4d-20	24.59	33.01	393.4	528.2	刮犁破坏
LB18-5d-20	21.66	26.72	433.2	534.4	刮犁破坏
LB20-5d-15	19.87	22.40	397.4	448.0	劈裂破坏
LB20-5d-20	19.74	22.96	394.8	459.2	劈裂破坏
LB20-6d-20	20.35	22.10	488.4	530.4	刮犁破坏
注：根据材料性能试验，直径18 mm 和20 mm 的钢筋实测屈服强度分别是470 MPa和457 MPa.

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表 5 粘结应力的拟合精度

Table 5. Accuracy of the regression analysis of the bonding stress

试件编号	τ_u，t/MPa	τ_u，c/MPa	比值
LB18-4d-15	30.70	30.39	1.014 0
LB20-5d-15	22.40	22.31	1.004 0
LB18-4d-20	33.01	32.54	1.014 6
LB20-5d-20	22.96	25.22	0.910 2
LB18-5d-20	26.72	26.51	1.007 6
LB20-6d-20	22.10	20.92	1.056 6

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表 6 式（5）精度校对

Table 6. Validation of quation（5）

试件	d/mm	l/mm	c/mm	${\tau _{{\rm{u,t}}}}$/ MPa	${\tau _{{\rm{u,c}}}}$/ MPa	比值
1	16	48	12	31.1	36.2	0.858 1
2	16	48	22	36.00	36.9	0.975 1
3	16	48	32	41.9	37.6	1.114 4
注：所选RPC试件混凝土抗压强度 f_cu = 147.1 MPa，钢　　纤维体积掺量V_f = 2%.

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表 7 最小锚固长度

Table 7. Calculation for the minimum anchorage length

试件	f_y/MPa	${\tau _{\rm{u}}}$/MPa	l_a/mm	建议锚固长度
LB18-4d-20	470	32.54	65.00	4d
LB20-6d-20	457	20.92	109.22	6d

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