聚丙烯纤维增强混凝土梁变形性能的试验研究

李福海; 何肖云峰; 吴昊南; 姜怡林; 王奕彬; 胡丁涵

doi:10.3969/j.issn.0258-2724.20190959

聚丙烯纤维增强混凝土梁变形性能的试验研究

doi: 10.3969/j.issn.0258-2724.20190959

基金项目: 四川省科研计划项目（2019YFG0001、2019YJ0219）；教育部产学合作协同育人项目（201801098032）

详细信息

作者简介:
李福海（1979—），男，副教授，博士，研究方向为混凝土材料及其耐久性，E-mail：lifuhai2007@home.swjtu.edu.cn

中图分类号: TU528.41
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- 被引次数: 0
出版历程
- 收稿日期: 2019-10-08
- 修回日期: 2020-02-06
- 网络出版日期: 2021-01-23
- 刊出日期: 2021-08-15

Experimental Study on Deformation Behavior of Polypropylene Fiber Reinforced Concrete Beams

摘要

摘要: 为探究PP-ECC梁与RC梁变形发展规律的区别，通过逐级加载和循环加载两种加载制度对4根PP-ECC梁和4根RC梁进行抗弯试验；同时，基于有效惯性矩法推导出适用于短期荷载作用下PP-ECC梁的最大变形计算公式. 研究结果表明：逐级加载下，PP-ECC梁呈现出更为明显的塑性变形阶段，与RC梁相比，PP-ECC梁经过5次循环加载后的循环荷载变形曲线与原曲线拟合度较好；循环加载过程中，PP-ECC梁在基准荷载下的加载变形增长率和卸载变形增长率均小于相同配筋率的RC梁，呈现出更好的抗损伤变形能力和变形恢复能力；基于有效惯性矩法推导出的变形修正模型计算结果与试验结果拟合度较好，可应用于实际工程对PP-ECC梁在短期荷载作用下最大变形的计算.
- PP-ECC梁 /
- 变形性能 /
- 加载制度 /
- 有效惯性矩法
Abstract: In order to explore the difference in deformation behaviors of polypropylene engineered cementitious composite (PP-ECC) beam and reinforced concrete (RC) beam, bending resistance tests were performed on four PP-ECC beams and four RC beams using two loading systems, i.e., step loading and cyclic loading. Meanwhile, based on the effective moment of inertia method, the maximum deformation calculation formula applicable to the PP-ECC beams under short-term loads was derived. The results show that the PP-ECC beam undergoes a more obvious plastic deformation stage under successive loading. Compared with the RC beam, the deformation curve of the PP-ECC beam after 5 cycles of cyclic loading fits better with the original curve. During cyclic loading, the growth rates of the loading and unloading deformation of PP-ECC beams under the reference load are both lower than those of RC beams with the same reinforcement ratio, showing better damage resistance and deformation recovery ability. In general, the calculated results of deformation correction model based on the effective moment of inertia method fit well with the test results, and the proposed method can be applied to the calculation of maximum deformation of PP-ECC beams under short-term load in practical engineering.
- PP-ECC beam /
- deformation performance /
- loading system /
- effective moment of inertia method

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图 1 制作工艺流程

Figure 1. Production process

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图 2 试件尺寸及截面配筋

Figure 2. Specimen size and section reinforcement

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图 3 单轴拉伸试验

Figure 3. Uniaxial tensile tes

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图 4 应力-应变曲线

Figure 4. Stress vs strain curve

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图 5 试验加载装置

Figure 5. Test loading device

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图 6 标准化荷载-跨中变形

Figure 6. Standardized load vs midspan deformation

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图 7 循环荷载变形

Figure 7. Cyclic load deformation

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图 8 试件抗损伤变形

Figure 8. Damage resistance and deformation of specimens

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图 9 试件变形增长率

Figure 9. Specimen deformation growth rates

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图 10 试件平均变形增长率

Figure 10. Average deformation growth rates of specimes

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图 11 试件卸载变形

Figure 11. Specimen unloading deformation

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图 12 试件卸载变形增长率

Figure 12. Specimen unloading deformation growth rates

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图 13 平截面假定

Figure 13. Flat section assumption

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图 14 弹性阶段受力

Figure 14. Stress diagram of elastic stage

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图 15 带裂缝工作阶段受力

Figure 15. Stress diagram of working stage of specimen with cracks

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图 16 屈服阶段受力

Figure 16. Stress diagram of yield stage

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图 17 试验结果与计算结果

Figure 17. Test and calculation results

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表 1 试件参数

Table 1. Sample parameters

编号	加载方式	材料	纵筋直径/mm	纵筋型号	箍筋直径/mm	箍筋型号
LRA-1	LRA	C30	8	HRB400	6	Q235
LRA-2		C30	10	HRB400	6	Q235
LRA-3		PP-ECC	8	HRB400	6	Q235
LRA-4		PP-ECC	10	HRB400	6	Q235
LRB-1	LRB	C30	8	HRB400	6	Q235
LRB-2		C30	10	HRB400	6	Q235
LRB-3		PP-ECC	8	HRB400	6	Q235
LRB-4		PP-ECC	10	HRB400	6	Q235

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表 2 PP纤维性能指标

Table 2. PP fiber performance indexes

参数	长度/ mm	密度/ （kg•m⁻³）	直径/ μm	抗拉强度/MPa	弹性模量/GPa	伸长率/%
取值	12	0.91 × 10³	20	480	5.00	15

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表 3 PP-ECC性能指标

Table 3. PP-ECC performance indexes

参数	开裂抗拉强度/ MPa	开裂抗拉应变/ %	极限抗拉强度/ MPa	极限抗拉应变/ %	极限抗压强度/ MPa	极限抗压应变/ %	弹性模量E/GPa
取值	0.84	0.09	2.32	3.8	32.09	0.41	13.35

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表 4 C30混凝土性能指标

Table 4. C30 concrete performance indexes

参数	抗压强度/MPa	抗压应变/%	弹性模量/GPa
取值	33.47	0.09	24.80

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表 5 HRB400钢筋性能指标

Table 5. HRB400 steel performance indexes

参数	直径/ mm	截面面积/mm²	屈服强度/MPa	极限强度/MPa	弹性模量/GPa
取值	8	50.24	406	576	197.00
取值	10	78.50	411	535	203.00

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表 6 卸载变形增长

Table 6. Unloading deformation growth

编号	平均卸载变形增长率/%		卸载变形增长方差/mm
编号	0	2.5 kN	0	2.5 kN
LRB-1	195.59	106.13	5.530	1.090
LRB-2	164.71	68.05	1.620	0.230
LRB-3	59.58	34.78	0.086	0.012
LRB-4	22.61	14.99	0.041	0.014

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