玄武岩纤维网格水泥基复合材料加固RC梁抗剪性能试验

doi:10.13229/j.cnki.jdxbgxb.20230306

摘要/Abstract

摘要：

通过5根试验梁进行三点弯曲静力加载试验，研究了玄武岩纤维网格水泥基复合材料（Basalt fabric-reinforced cementitious matrix，B-FRCM）对钢筋混凝土梁的抗剪加固效果的影响，分析了试验梁的破坏形态以及玄武岩纤维增强复合材料（Basalt fiber reinforced polymer， BFRP）网格在受力过程中的抗剪贡献，并将试验结果与收集的计算模型进行对比。结果表明：采用B-FRCM加固后的RC梁抗剪承载力有较为明显的提升，提升幅值在24%~33%；B-FRCM加固可有效抑制斜裂缝发展，延缓极限状态的出现；在已有4种计算模型中，都高估了BFRP网格的抗剪贡献。

关键词: 结构工程, BFRP网格, 工程水泥基复合材料（ECC）, 箍筋间距, 抗剪性能, 计算模型

Abstract:

Three-point bending static loading tests were carried out on five test beams to study the effect of basalt fiber fabric-reinforced cementitious matrix （B-FRCM ） on the shear reinforcement effect of reinforced concrete beams. The failure modes of the test beams and the shear contribution of basalt fiber reinforced polymer （BFRP） grids in the process of loading were analyzed， and the test results were compared with the collected calculation models. The results show that the shear capacity of RC beams strengthened with B-FRCM is obviously improved， and the increase amplitude is 24% ~33%. B-FRCM reinforcement can effectively inhibit the development of inclined cracks and delay the occurrence of limit state. In the four existing calculation models， the shear contribution of BFRP grids is overestimated.

Key words: structural engineering, BFRP grid, engineering cementations composite （ECC）, stirrup spacing, shear performance, calculation model

中图分类号:

TU375.1

姜浩,赵正文. 玄武岩纤维网格水泥基复合材料加固RC梁抗剪性能试验[J]. 吉林大学学报(工学版), 2025, 55(1): 211-220.

Hao JIANG,Zheng-wen ZHAO. Experiment on shear performance of RC beams strengthened with basalt fiber grid cement-based composites[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(1): 211-220.

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混凝土强度等级	受拉纵筋/mm	箍筋/mm	剪跨比a/h₀	箍筋间距/mm	网格间距/mm	试验梁名称
C40	5C20	C6@150/75	2.85	150	—	S1-NS
				150	50×50	S1-G1
				150	100×100	S1-G2
				75	—	S2-NS
				75	50×50	S2-G1

材料类别	标准立方体抗压度/MPa	平均抗压强度/MPa	抗拉强度/MPa	平均抗拉强度/MPa	弹性模量/GPa
C40	46.70	48.20	2.52	2.67	34.3
	48.48		2.63
	49.42		2.86
ECC	63.52	65.16	6.15	6.43	25.9
	66.30		6.51
	65.66		6.63

材料类别	横截面积/mm²	屈服强度/MPa	极限抗拉强度/MPa	弹性模量/GPa
纵筋D20	314.16	445	615	200
箍筋D6	28.26	413	615	200
BFRP网格	3.62	-	2362	87

试件名称	箍筋间距/mm	网格间距/mm	开裂荷载/kN	极限荷载/kN	极限荷载提升幅值/%	极限位移/mm	极限位移提升幅值/%	破坏模式
S1-NS	150	-	40	167.9	-	5.8	-	SC
S1-G1		50×50	43	224.5	33.7	7.0	20.7	SC
S1-G2		100×100	48	209.1	24.5	6.8	17.2	SC
S2-NS	75	-	52	221.9	-	6.7	-	SC
S2-G1	75	50×50	54	259.9	17.1	7.1	6.0	SC+PD

试件编号	V_exp/kN	V_g₁/kN	V_exp/V_g₁	V_g₂/KN	V_exp/V_g₂	V_g₃/kN	V_exp/V_g₃	V_g₄/kN	V_exp/V_g₄
平均值	—	—	0.83	—	0.93	—	0.87	—	0.93
S1-NS	167.9	172.1	0.98	172.1	0.98	172.1	0.98	172.1	0.98
S1-G1	224.5	324.1	0.69	247.2	0.91	286.3	0.78	249.2	0.90
S1-G2	209.1	267.5	0.78	229.2	0.91	248.5	0.84	235.6	0.89
S2-NS	221.9	221.7	1.00	221.7	1.00	221.7	1.00	221.7	1.00
S2-G1	259.9	373.6	0.70	296.8	0.87	335.9	0.77	298.8	0.87