钢-聚丙烯混杂纤维混凝土剪力墙抗震性能

doi:10.13229/j.cnki.jdxbgxb20200095

摘要/Abstract

摘要：

通过2片钢-聚丙烯混杂纤维混凝土（SPFRC）剪力墙和1片钢筋混凝土（RC）剪力墙的低周反复加载试验，研究了SPFRC剪力墙的受力机理，分析了纤维掺量和轴压比对剪力墙破坏形态、受剪承载力、延性和耗能能力的影响。试验结果表明：在轴压比相同的条件下，混杂纤维可有效抑制剪力墙裂缝的发展，提高剪力墙的受剪承载力、变形能力、耗能能力；掺入混杂纤维的试件，随着轴压比由0.1提高至0.2，其承载能力和延性有所提高，但耗能能力有所下降；同时综合考虑混杂纤维、水平和竖向分布钢筋、混凝土斜压杆以及暗柱对受剪承载力的贡献，依据桁架-斜压杆机构机理，建立了SPFRC剪力墙受剪承载力计算公式，并通过本文及国内相关文献数据对其进行了验证，受剪承载力实测值与计算值比值的平均值为1.01，标准差为0.17，两者吻合较好。

关键词: 土木工程, 钢-聚丙烯混杂纤维, 暗柱, 剪力墙, 受剪承载力, 耗能能力, 抗震性能

Abstract:

The mechanical characteristics of the steel-plypropylene hybrid fiber concrete （SPFRC） shear walls were studied by cyclic testing on two SPFRC shear walls and one reinforced concrete （RC） shear wall under reversed cyclic loading．The effects of fiber content and axial load ratio on the failure pattern， shear capacity， ductility and energy dissipation capacity of the shear walls are analyzed. The test results show that under the same axial load ratios， the hybrid fiber can effectively restrain the development of shear wall cracks， improve the shear capacity， deformation capacity and energy dissipation capacity of the shear wall. For hybrid fiber specimens， with the increase of axial load ratio from 0.1 to 0.2， the bearing capacity and ductility are improved， but the energy dissipation capacity declined. According to the mechanism of truss-slope lever mechanism， the SPFRC shear wall shear bearing capacity calculation equation was established， in which the contribution of horizontal and vertical distribution of rebar， concrete oblique lever and concealed columns to the shear-bearing capacity are taken into consideration. This equation is verified using domestic relevant data. The average value of the ratio between measured and calculated shear bearing capacity is 1.01 and the standard deviation is 0.17， which are well matched.

Key words: civil engineering, steel-polypropylene hybrid fiber, concealed column, shear wall, shear capacity, energy dissipation capacity, seismic performance

中图分类号:

TU528.01

张广泰,张路杨,邢国华,曹银龙,易宝. 钢-聚丙烯混杂纤维混凝土剪力墙抗震性能[J]. 吉林大学学报(工学版), 2021, 51(3): 946-955.

Guang-tai ZHANG,Lu-yang ZHANG,Guo-hua XING,Yin-long CAO,Bao YI. Seismic performance of steel⁃polypropylene hybrid fiber reinforced concrete shear wall[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(3): 946-955.

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试件编号	混凝土强度	水	水泥	砂	石	减水剂
SWC-0.1	C50	155	384	630	1100	5.76
SWH-0.1	C50	155	384	630	1100	6.24
SWH-0.2	C50	155	384	630	1100	6.24

钢筋种类	直径 /mm	屈服强度 /MPa	极限抗拉强度 /MPa
HRB400	6	505	710
HRB400	8	510	715
HRB500	12	650	820
HRB500	18	550	705
HRB500	25	530	705

试件编号	立方体抗压强度/MPa	轴心抗压强度/MPa	劈裂抗拉强度/MPa
P0S0	62.60	40.6	3.90
P1.2S0	65.89	42.7	4.66
P0S1.5	80.50	52.1	5.16
P1.2S1.5	82.70	54.8	5.96

试件编号	方向	开裂		屈服		峰值		极限		延性系数
试件编号	方向	荷载/kN	位移/mm	荷载/kN	位移/mm	荷载/kN	位移/mm	荷载/kN	位移/mm	延性系数
SWC-0.1	正向	186.08	1.80	408.78	8.94	491.60	15.82	441.35	17.24	1.77
	反向	189.95	2.80	352.98	7.89	427.94	11.79	371.18	13.82	1.75
	均值	188.02	2.30	380.86	8.42	459.77	13.81	406.27	15.53	1.76
SWH-0.1	正向	185.85	1.98	434.49	8.52	505.46	13.86	447.46	17.98	2.11
	反向	201.32	2.95	456.61	9.69	544.24	15.97	534.90	18.00	1.86
	均值	193.59	2.47	445.55	9.11	524.85	14.92	491.18	17.99	1.99
SWH-0.2	正向	333.10	2.95	575.29	6.89	655.22	10.88	556.94	13.22	1.92
	反向	377.10	4.04	630.26	8.55	638.35	17.51	542.60	19.53	2.28
	均值	355.10	3.50	602.78	7.72	646.79	14.20	549.77	16.38	2.10

试件编号	S_ABC+S_ADC/mm²	S_Δ_OBD+S_Δ_ODF/mm²	γ_e
SWC-0.1	3983.664	5577.629	0.114
SWH-0.1	9235.661	7999.702	0.184
SWH-0.2	5051.534	8014.535	0.101