摘要
对2个钢-聚丙烯混杂纤维混凝土(SPFRC)剪力墙和1个普通混凝土剪力墙,开展低周往复水平加载试验,分析纤维掺量和轴压比对剪力墙滞回耗能、承载能力、刚度衰减、变形能力等性能的影响。结果表明:轴压比为0.1时,钢-聚丙烯混杂纤维的掺入能有效提高混凝土的变形能力,加载初期不掺纤维的试件刚度大于掺入纤维的试件;轴压比增至0.2时,大幅提升SPFRC剪力墙的水平极限承载力,受力过程中刚度下降较快。考虑两种纤维对混凝土增强、剪力墙的竖向和横向分布抗剪钢筋的贡献以及混凝土材料的开裂软化。依据修正的软化拉-压杆模型,建立SPFRC剪力墙水平受剪承载力的理论公式,并与规范的计算公式相比较。剪力墙抗剪承载力的试验值与本文计算模型计算值比值的平均差0.99,标准差0.0014,计算结果和试验结果吻合程度高。
For two steel-polypropylene hybrid fiber reinforced concrete(SPFRC) shear walls and one common concrete shear wall, low cycle reciprocating horizontal loading tests were carried out to analyze the impact of fiber content and axial compression ratio on hysteretic energy dissipation, bearing capacity, stiffness attenuation and deformation capacity. The results show that when the axial com-pression ratio is 0.1, the addition of steel-polypropylene hybrid fiber can effectively improve the deformation capacity of concrete, at the initial loading stage, the stiffness of specimen without fiber is greater than that of the specimen with fiber. When the axial compression ratio increased to 0.2, the horizontal ultimate bearing capacity of the SPFRC shear wall is significantly increased, and the stiffness decreases rapidly in the process of loading. Considering the contribution of the two fibers to the reinforcement of concrete, the vertical and transverse distribution of shear rebar in shear walls and the cracking and softening of concrete materials. Based on the modified softened strut-and-tie model, the theoretical formula of horizontal shear capacity of SPFRC shear wall is established, and compared with the calculation formula of the standard. The mean difference of the ratio between the experimental value and the calculated value is 0.99, and the standard deviation is 0.0014, the calculated results are in good agreement with the experimental results.
作者
张广泰
鲁海波
李雪藩
吴锐
Zhang Guang-tai;Lu Hai-bo;Li Xue-fan;Wu Rui(College of Civil Engineering and Architecture,Xinjiang University,Urumqi 830046,China;Xinjiang Key Laboratory of Building Structures arul Earthquake Resistance,Urumqi 830046,China)
出处
《工程抗震与加固改造》
北大核心
2022年第2期33-40,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(51968070)。
