钢-ECC/UHPC组合梁负弯矩区力学性能研究

武芳文; 左剑; 樊州; 贺润斌; 刘壮壮; 何岚清

doi:10.19818/j.cnki.1671-1637.2024.01.014

钢-ECC/UHPC组合梁负弯矩区力学性能研究

doi: 10.19818/j.cnki.1671-1637.2024.01.014

长安大学公路学院，陕西西安 710064

基金项目:

国家自然科学基金项目 52378121

陕西省自然科学基础研究计划项目 2022JZ-32

中央高校基本科研业务费专项资金项目 300102212212

详细信息

作者简介:
武芳文(1980-)，男，河北邯郸人，长安大学副教授，工学博士，从事钢-混凝土组合结构理论与应用研究

中图分类号: U441.4
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出版历程
- 收稿日期: 2023-08-27
- 网络出版日期: 2024-03-13
- 刊出日期: 2024-02-25

Investigation on mechanical properties of steel-ECC/UHPC composite girders in negative moment regions

School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Natural Science Foundation of China 52378121

Natural Science Basic Research Project of Shaanxi Province 2022JZ-32

Fundamental Research Funds for the Central Universities 300102212212

More Information

Author Bio:
WU Fang-wen(1980-), male, associate professor, PhD, wufangwen@chd.edu.cn

摘要

摘要:
为改善钢-混组合梁负弯矩区混凝土易开裂缺点，引入工程水泥基复合材料(ECC)和超高性能混凝土(UHPC)代替普通混凝土(NC)形成钢-ECC/UHPC组合梁，展开了1片钢-NC组合梁、1片钢-ECC组合梁和2片钢-UHPC组合梁的负弯矩区静力试验；结合有限元分析方法对比了不同类型混凝土的应变、裂缝扩展与分布特点，分析了混凝土类型和配筋对钢-混组合梁破坏形态、承载能力与变形能力影响规律。研究结果表明：钢-混组合梁在负弯矩作用下整体协同工作性能良好，破坏形态均为弯曲破坏；ECC和UHPC裂缝呈现纤细的特点，ECC尤为明显；与钢-NC组合梁相比，钢-ECC组合梁和钢-UHPC组合梁的开裂荷载分别提高了2.00和2.75倍，抗弯刚度分别提高了17.23%和35.73%，抗弯承载力分别提高了9.00%和6.81%，表明UHPC抗裂能力更强，可以有效改善钢-混组合梁负弯矩区桥面板抗裂性能，ECC与UHPC代替NC可以提高钢-混组合梁的抗弯刚度和承载力；配筋与无筋钢-UHPC组合梁的开裂荷载和前期刚度无显著差异，无筋钢-UHPC组合梁破坏时形成贯通裂缝，其承载力相比配筋钢-UHPC组合梁下降了13.39%；ECC强度增加，钢-ECC组合梁承载力提高较显著，UHPC强度变化对钢-UHPC组合梁承载力影响不明显；配筋率对钢-UHPC组合梁承载力影响可分为2个阶段，当配筋率小于1.6%时承载力显著增长，当超过1.6%时承载力增幅趋缓。
- 桥梁工程 /
- 钢-混组合梁 /
- 模型试验 /
- 负弯矩 /
- 工程水泥基复合材料 /
- 超高性能混凝土
Abstract:
In order to improve the concrete cracking defect in the negative moment regions of steel-concrete composite girders, the engineered cementitious composite (ECC) and ultra-high performance concrete (UHPC) were introduced to replace the normal concrete (NC) to form the steel-ECC/UHPC composite girders. The tests of static mechanical properties in the negative moment regions were carried out, involving one steel-NC composite girder, one steel-ECC composite girder, and two steel-UHPC composite girders. The finite element analysis method was utilized to compare the strain, crack propagation, and distribution characteristics of different types of concretes. The influences of concrete type and reinforcement on the failure mode, bearing capacity and deformation capacity of steel-concrete composite girders were analyzed. Research results show that the steel-concrete composite girders have good overall cooperative performance under negative moments, and the failure modes are all bending failure. Cracks in the ECC and UHPC are delicate, especially in the ECC. Compared with the steel-NC composite girder, the cracking loads of steel-ECC and steel-UHPC composite girders increase by 2.00 and 2.75 times, the flexural stiffnesses increase by 17.23% and 35.73%, and the flexural capacities increase by 9.00% and 6.81%, respectively. Therefore, the UHPC has stronger crack resistance, effectively improving the crack resistance of bridge decks in negative moment region of the steel-concrete composite girders. Moreover, using the ECC and UHPC to replace the NC can enhance the flexural stiffness and bearing capacity of steel-concrete composite girders. There is no significant difference in the cracking load and early stiffness between the reinforced and unreinforced steel-UHPC composite girders. When the unreinforced steel-UHPC composite girder fails, the through cracks form, and its bearing capacity decreases by 13.39% compared to the reinforced steel-UHPC composite girder. As the ECC strength increases, the bearing capacity of steel-ECC composite girder improves significantly. The influence of UHPC strength on the bearing capacity of steel-UHPC composite girder is not obvious. The impact of reinforcement ratio on the bearing capacity of steel-UHPC composite girder can be divided into two stages. When the reinforcement ratio is below 1.6%, the bearing capacity increases significantly, and when it exceeds 1.6%, the growth rate of bearing capacity slows down.
- bridge engineering /
- steel-concrete composite girder /
- model test /
- negative moment /
- ECC /
- UHPC

HTML全文

图 1 试验梁构造和尺寸(单位：mm)

Figure 1. Test girder construction and dimensions (unit: mm)

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图 2 材料力学性能试验

Figure 2. Mechanical properties tests of materials

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图 3 加载装置

Figure 3. Loading device

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图 4 测点布置(单位：mm)

Figure 4. Layout of measuring points (unit: mm)

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图 5 试验梁破坏形态

Figure 5. Failure modes of test girders

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图 6 荷载-位移曲线

Figure 6. Load-displacement curves

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图 7 试验梁对比

Figure 7. Comparison of test girders

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图 8 中支点截面应变分布

Figure 8. Strain distributions of middle fulcrum sections

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图 9 中和轴位置变化曲线

Figure 9. Changing curves of neutral axis positions

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图 10 混凝土和钢筋应变曲线

Figure 10. Strain curves of concrete and reinforcement

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图 11 混凝土应力释放

Figure 11. Concrete stress release

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图 12 混凝土板裂缝分布

Figure 12. Crack distributions of concrete slabs

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图 13 有限元模型(单位：mm)

Figure 13. Finite element model (unit: mm)

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图 14 试验与模拟荷载-位移曲线对比

Figure 14. Comparison of load-displacement curves between test and simulation

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图 15 破坏状态主应变云图

Figure 15. Principal strain cloud diagrams at failure state

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图 16 配筋率分析

Figure 16. Analysis of reinforcement ratios

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图 17 UHPC板强度分析

Figure 17. Strength analysis of UHPC slabs

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图 18 ECC板强度分析

Figure 18. Strength analysis of ECC slabs

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表 1 试验梁设置

Table 1. Test girders setting

梁号	混凝土类型	配筋
SNCB-1	NC	有
SECB-1	ECC	有
SUCB-1	UHPC	有
SUCB-0	UHPC	无

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表 2 材料性能参数

Table 2. Material performance parameters

材料类型	规格	f_y/MPa	f_cu/MPa	f_tu/MPa	E_s/GPa
纵向钢筋	HRB400	388.20		493.50	212.30
H型钢	Q345C	375.00		501.00	209.80
NC	C50		61.78	3.05	37.53
ECC	C50		60.99	4.63	19.60
UHPC	C120		127.70	6.90	42.65

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表 3 混凝土材料塑性损伤参数

Table 3. Plastic damage parameters of concrete material

参数	膨胀角/(°)	偏心率	强度比	常应力比值	黏聚系数
取值	30	0.1	1.16	0.666 7	0.000 5

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表 4 试验与模拟结果对比

Table 4. Comparison of test and simulation results

梁号	试验值/kN	模拟值/kN	模拟值/试验值
SNCB-1	411	372.7	0.907
SECB-1	448	413.1	0.922
SUCB-1	439	420.3	0.957
SUCB-0	388	374.6	0.966

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钢-ECC/UHPC组合梁负弯矩区力学性能研究

doi: 10.19818/j.cnki.1671-1637.2024.01.014

作者简介:
武芳文(1980-)，男，河北邯郸人，长安大学副教授，工学博士，从事钢-混凝土组合结构理论与应用研究

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Investigation on mechanical properties of steel-ECC/UHPC composite girders in negative moment regions

Author Bio:
WU Fang-wen(1980-), male, associate professor, PhD, wufangwen@chd.edu.cn

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钢-ECC/UHPC组合梁负弯矩区力学性能研究

doi: 10.19818/j.cnki.1671-1637.2024.01.014

作者简介: 武芳文(1980-)，男，河北邯郸人，长安大学副教授，工学博士，从事钢-混凝土组合结构理论与应用研究

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Investigation on mechanical properties of steel-ECC/UHPC composite girders in negative moment regions

Author Bio: WU Fang-wen(1980-), male, associate professor, PhD, wufangwen@chd.edu.cn

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出版历程

目录

作者简介:
武芳文(1980-)，男，河北邯郸人，长安大学副教授，工学博士，从事钢-混凝土组合结构理论与应用研究

Author Bio:
WU Fang-wen(1980-), male, associate professor, PhD, wufangwen@chd.edu.cn