BFRP加固损伤混凝土梁挠度计算方法

秦丽辉; 李岩; 王宗林; AL-DULAIMIA F N

BFRP加固损伤混凝土梁挠度计算方法

1.
东北农业大学水利与建筑学院, 黑龙江哈尔滨 150030
2.
哈尔滨工业大学交通科学与工程学院, 黑龙江哈尔滨 150090
3.
姆萨巴技术学院建筑工程系, 巴比伦姆萨巴

基金项目:

国家自然科学基金项目 51108132

详细信息

作者简介:
秦丽辉(1977-), 女, 吉林舒兰人, 东北农业大学讲师, 工学博士, 从事桥梁加固研究

中图分类号: U441.3
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- 被引次数: 0
出版历程
- 收稿日期: 2014-06-18
- 刊出日期: 2014-12-25

Deflection calculating method of damaged concrete beams strengthened with BFRP

1.
School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, Heilongjiang, China
2.
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
3.
Department of Building and Construction Engineeing, Al-MussaibTechnical College, Al-Mussaib, Babylon, Iraq

More Information

Author Bio:
QIN Li-hui (1977-), female, lecturer, PhD, +86-451-55191534, qinlh1977@126.com

摘要

摘要: 为了准确计算玄武岩纤维增强复合材料(BFRP) 加固损伤混凝土梁的挠度, 为BFRP加固损伤混凝土梁的设计与施工提供理论依据, 按照配筋率不同设计了11片试验梁进行试验, 每组试验梁设置不同的BFRP布加固量与加载方法。计算了各试验梁的荷载-挠度曲线, 分析了未加固梁、1层BFRP布加固梁、2层BFRP布加固梁在不同初始荷载下的挠度变化规律。给出了BFRP加固损伤混凝土梁跨中挠度的计算公式, 对比了挠度计算值与实测值。分析结果表明: BFRP加固混凝土梁的挠度受初始荷载和加固量的影响, 有初始荷载的加固梁挠度较无初始荷载的加固梁挠度增大30%~4%, 2层BFRP布加固梁的挠度较1层加固梁的挠度增大19%~2%, 计算挠度时需考虑BFRP布滞后应变的影响; 挠度计算值与实测值的最大差值平均为7.26 mm, 初始荷载小与配筋率高的试验梁挠度计算值与实测值较为接近, 可以用于实际工程计算。
- 桥梁工程 /
- 损伤混凝土梁 /
- 玄武岩纤维增强复合材料 /
- 挠度 /
- 加固 /
- 初始荷载
Abstract: In order to accurately calculate the deflection of damaged concrete beam strengthened with basalt fiber reinforced plastics (BFRP) and provide theoretical foundation for the design and construction of the beam, according to different reinforcement ratios, eleven test beams with different amounts of strengthened BFRP sheet and loading methods were designed.The loaddeflection curves of different test beams were obtained.Under different pre-loading programs, the changing rules of deflection of un-strengthened beams, strengthened beams with one layer and two layers of BFRP sheet were analyzed respectively.The calculation formulas of mid-span deflection of damaged concrete beam strengthened with BFRP were presented, and the calculated deflections and measured values were compared.Analysis result indicates that the deflections of damaged concrete beams strengthened with BFRP are influenced by initial load and amount of BFRP sheet layer.The deflections of strengthened beams with initial load increase by 30%-94%compared with strengthened beams without initial load, and the deflections of strengthenedbeams with two layers of BFRP sheet increase by 19%-42% compared with strengthened beams with one layer of BFRP sheet.The impact of post-strain of BFRP should be considered in deflection calculation.The average value of the maximum difference between the calculated deflection and measured value is 7.26 mm.When the initial load is small and the reinforcement ratio is high, the calculated deflection of concrete beam is closer to the measured value, and the method can be used in the engineering practice.
- bridge engineering /
- damaged concrete beam /
- BFRP /
- deflection /
- strengthening /
- initial load

HTML全文

图 1 试验梁配筋

Figure 1. Reinforcement of test beam

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图 2 试验梁BFRP加固

Figure 2. Test beams strengthened with BFRP

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图 3 加载装置与应变测点布置

Figure 3. Loading device and layout of strain test points

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图 4 未加固梁荷载-挠度曲线

Figure 4. Load-deflection curves of un-strengthened beams

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图 5 加固无损伤梁荷载-挠度曲线

Figure 5. Load-deflection curves of strengthened nondestructive beams

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图 6 梁A2-2与B2-2的荷载-挠度曲线

Figure 6. Load-deflection curves of A2-2 and B2-2 beams

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图 7 梁A1-1与A1-2的荷载-挠度曲线

Figure 7. Load-deflection curves of A1-1 and A1-2 beams

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图 8 梁A2-1、A2-2的荷载-挠度曲线

Figure 8. Load-deflection curves of A2-1 and A2-2 beams

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图 9 梁B2-2、B2-3的荷载-挠度曲线

Figure 9. Load-deflection curves of B2-2 and B2-3 beams

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图 10 试验梁最大挠度对比

Figure 10. Comparison of maximum deflections of test beams

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图 11 应力-应变关系

Figure 11. Relationships between stress and strain

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图 12 挠度计算值与实测值的对比

Figure 12. Comparison of calculated and measured deflections

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表 1 试验梁参数

Table 1. Parameters of test beams

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表 2 试验梁加载方法

Table 2. Loading methods of test beams

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