预制UHPC-RAC组合短柱轴压性能

秦朝刚; 杜锦霖

doi:10.13801/j.cnki.fhclxb.20231020.002

预制UHPC-RAC组合短柱轴压性能

doi: 10.13801/j.cnki.fhclxb.20231020.002

秦朝刚^,,
杜锦霖

长安大学　建筑工程学院，西安 710061

基金项目: 中国博士后科学基金(2021T140587)；陕西省自然科学基础研究计划项目(2023-JC-YB-326)；长安大学中央高校基本科研业务费高新技术项目(300102282208)

详细信息

通讯作者:
秦朝刚，博士，副教授，硕士生导师，研究方向为低碳装配式混凝土结构体系与设计理论　E-mail：qinchaogang@chd.edu.cn

中图分类号: TU375.3；TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2023-08-11
- 修回日期: 2023-10-01
- 录用日期: 2023-10-16
- 网络出版日期: 2023-10-23
- 刊出日期: 2024-06-15

Axial compression performance of precast UHPC-RAC composite short column

QIN Chaogang^,,
DU Jinlin

School of Civil Engineering, Chang'an University, Xi'an 710061, China

Funds: China Postdoctoral Science Foundation (2021T140587); Natural Science Foundation of Shaanxi Province (2023-JC-YB-326); Fundamental Research Funds for the Central Universities, CHD (300102282208)

摘要

摘要: 将优势互补的超高性能混凝土(Ultra-high performance concrete，UHPC)和再生混凝土(Recycled aggregate concrete，RAC)组合设计为预制UHPC-RAC组合柱。以箍筋位置、UHPC壁厚和UHPC-RAC结合面粗糙度为参数，设计制作了7个预制UHPC-RAC组合短柱，通过轴压试验，分析了破坏形态、材料应变、荷载-位移曲线、承载力、泊松比和损伤等性能参数。结果表明：预制UHPC-RAC组合短柱改善了RAC短柱的破坏形态，因外围UHPC与箍筋形成组合作用对内部RAC约束效果的不同，分为强约束的剪切压溃破坏和弱约束的外壁UHPC劈裂破坏；配箍UHPC及其厚度的增加，增强了外围UHPC的约束作用，提高了预制UHPC-RAC组合短柱的轴压刚度和受压承载力，最大可提升93.3%和97.4%，降低了泊松比和损伤指数，其中泊松比的变化范围为0.26~0.18；UHPC-RAC结合面粗糙度对轴压性能呈现有利影响但差异较小。强约束效果保证了高性能材料力学性能的发挥，采用叠加原理，建立了可准确计算强约束预制UHPC-RAC组合柱的受压承载力计算公式，并提出了预制UHPC-RAC组合短柱的设计要求，提升材料的利用率。
- 超高性能混凝土 /
- 再生混凝土 /
- 预制组合短柱 /
- 约束作用 /
- 轴压性能 /
- 受压承载力
Abstract: The combination design of ultra-high performance concrete (UHPC) and recycled aggregate concrete (RAC) forms the precast UHPC-RAC composite columns. Seven precast UHPC-RAC composite short columns were designed and fabricated with the parameters of stirrup position, UHPC thickness and UHPC-RAC interface roughness. The failure form, material strain, load-displacement curve, bearing capacity, Poisson's ratio and damage were analyzed through the axial compression experiments. The results show that the precast UHPC-RAC composite short columns improve the failure pattern, which can be divided into strong confining shear collapse failure and weak confining of UHPC splitting due to the difference in the binding effect of the combination of external UHPC and stirrup on internal RAC. The increase thickness of hooped UHPC ensures the enhancement of external UHPC restraint. The restraint effect of the outer UHPC is enhanced with the increase of the hoop UHPC and its thickness. The axial compressive stiffness and compression capacity of the prefabricated UHPC-RAC short column are increased by 93.3% and 97.4% at the maximum, and the Poisson's ratio and damage index are decreased, with the Poisson's ratio varying from 0.26 to 0.18. The roughness of UHPC-RAC bonding surface has little difference on the favorable influence of axial compression performance parameters. The strong constraint effect can make full use of the mechanics of high performance materials. Based on the superposition principle, the calculation formula of the compression capacity of the strongly constrained precast UHPC-RAC composite column is established, and the design requirements of the precast UHPC-RAC composite short column are proposed to improve the utilization rate of the material.
- ultra-high performance concrete /
- recycled aggregate concrete /
- precast composite short column /
- restraining effect /
- axial compression performance /
- compressive capacity

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图 1 超高性能混凝土(UHPC)的主要成分

Figure 1. Main ingredients of ultra-high performance concrete (UHPC)

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图 2 UHPC的基本力学性能测试

Figure 2. Basic mechanical properties test of UHPC

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图 3 预制UHPC-RAC组合短柱的截面设计

R—Radius of the UHPC core column

Figure 3. Section design of the precast UHPC-RAC composite short columns

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图 4 预制UHPC-RAC组合短柱的制作

Figure 4. Construction of the precast UHPC-RAC composite short columns

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图 5 预制UHPC-RAC组合短柱的加载与测试装置

Figure 5. Loading and testing device of the precast UHPC-RAC composite short columns

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图 6 钢筋应变片的布置

Figure 6. Arrangement of reinforcement strain gauges

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图 7 预制UHPC-RAC组合短柱的破坏形态

Figure 7. Failure pattern of the precast UHPC-RAC composite short columns

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图 8 预制UHPC-RAC组合短柱的典型破坏形态

Figure 8. Typical failure patterns of the precast UHPC-RAC composite short columns

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图 9 不同因素影响下预制UHPC-RAC组合短柱试件的荷载-位移曲线

Figure 9. Load-displacement curves of the precast UHPC-RAC composite short column specimens under the influence of different factors

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图 10 预制UHPC-RAC组合短柱的受压承载力

Figure 10. Compressive capacity of the precast UHPC-RAC composite short columns

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图 11 不同因素影响下钢筋和UHPC的应变

Figure 11. Strain of steel rebar and UHPC under different influence factors

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图 12 预制UHPC-RAC组合短柱的泊松比

Figure 12. Poisson' ratio of the precast UHPC-RAC composite short columns

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图 13 预制UHPC-RAC组合短柱的损伤

Figure 13. Damage of the precast UHPC-RAC composite short columns

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表 1 再生混凝土(RAC)、UHPC和钢筋的力学性能参数

Table 1. Mechanical properties of recycled aggregate concrete (RAC), UHPC and reinforcements

Material	Compressive strength/MPa	Tensile strength/MPa	Material	Yielding strength/MPa	Ultimate strength/MPa
RAC	26.20	–	C6	400.5	568.4
UHPC	101.78	9.30	C10	456.5	621.3
Notes: C6—Steel bars with a diameter of 6 mm ; C10—Steel bars with a diameter of 10 mm.

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表 2 预制UHPC-RAC组合短柱的设计参数

Table 2. Design parameters of the precast UHPC-RAC composite short columns

Specimen	ρ_v/%	ρ/%	Thickness/ mm	Roughness/ mm
R-C1	0.97	1.01	–	–
U20¦S/L/R-C2	0.92		20	–
U20¦S¦L/R-C3	0.90		20	–
U20/S¦L/R-C4	0.87		20	0
U15/S¦L/R-C5	0.83		15	–
U30/S¦L/R-C6	0.96		30	–
U20/S¦L/R-I1.6-C7	0.87		20	1.6
U20/S¦L/R-I3.2-C8	0.87		20	3.2
Notes: U—UHPC; R—RAC; S—Stirrup; L—Longitudinal bar; "/"—S or L locating in RAC or UHPC; "¦"—Interface between UHPC and RAC; I—Interface roughness; ρ_v—Volume-stirrup ratio; ρ—Longitudinal reinforcement ratio. For example, U20/S¦L/R-I3.2-C8 represents the eighth column whose UHPC thickness is 20 mm, the “S” stirrup locating in UHPC, “L” longitudinal bar locating in the RAC, and the bonding surface roughness is 3.2 mm; and U20¦S¦L/R-C3 represents the third column whose UHPC thickness is 20 mm, “S” stirrup locating in the interface between UHPC and RAC, “L” longitudinal bar locating in the RAC.

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表 3 预制UHPC-RAC组合短柱的轴压性能参数

Table 3. Axial compression performance parameter of the precast UHPC-RAC composite short columns

Specimen	N_cr/kN	δ_cr/mm	N_y/kN	δ_y/mm	N_u/kN	δ_u/mm	K/(kN·mm^–1)	S_i
R-C1	1010.40	2.11	1305.36	2.78	1984.20	4.79	437.01	1.00
U20¦S/L/R-C2	1290.32	2.23	1960.04	3.43	2351.40	4.52	553.78	1.19
U20¦S¦L/R-C3	1463.40	2.15	2549.60	3.45	3024.60	4.46	740.73	1.52
U20/S¦L/R-C4	1747.84	2.40	2488.52	3.20	3370.40	4.74	772.26	1.70
U15/S¦L/R-C5	1645.40	2.11	2331.64	3.16	2692.20	4.21	721.44	1.36
U30/S¦L/R-C6	2668.98	3.16	3612.99	4.37	3779.52	4.94	844.79	1.90
U20/S¦L/R-I1.6-C7	1878.40	2.63	3430.56	4.40	3792.12	5.03	774.96	1.91
U20/S¦L/R-I3.2-C8	1682.02	1.96	3598.72	4.36	3916.36	4.83	818.66	1.97
Notes: N_cr—Cracking load; δ_cr—Cracking displacement; N_y—Yielding load; δ_y—Yielding displacement; N_u—Ultimate load; δ_u—Ultimate displacement; K—Compressive stiffness; S_i—Coefficient of increase of axial compressive capacity.

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表 4 预制UHPC-RAC组合短柱的受压承载力计算

Table 4. Compression capacity calculation of the precast UHPC-RAC composite short columns

Specimen	N_t/kN	N_c/kN	N_c/N_t
R-C1	1984.20	1924.18	0.97
U20¦S/L/R-C2	2351.40	3463.18	1.47
U20¦S¦L/R-C3	3024.60	3463.18	1.15
U20/S¦L/R-C4	3370.40	3463.18	1.03
U15/S¦L/R-C5	2692.20	3138.19	1.17
U30/S¦L/R-C6	3779.52	4067.82	1.08
U20/S¦L/R-I1.6-C7	3792.12	3531.32	0.93
U20/S¦L/R-I3.2-C8	3916.36	3598.93	0.92
Notes: N_t—Test ultimate load of the precast UHPC-RAC composite columns; N_c—Calculated ultimate load of the precast UHPC-RAC composite columns.

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