张秀芳, 张驰, 刘瑞强. 型钢UHTCC短柱的抗震性能研究[J]. 工程力学, 2023, 40(5): 125-139. DOI: 10.6052/j.issn.1000-4750.2021.10.0827
引用本文: 张秀芳, 张驰, 刘瑞强. 型钢UHTCC短柱的抗震性能研究[J]. 工程力学, 2023, 40(5): 125-139. DOI: 10.6052/j.issn.1000-4750.2021.10.0827
ZHANG Xiu-fang, ZHANG Chi, LIU Rui-qiang. A STUDY ON SEISMIC PERFORMANCE OF STEEL REINFORCED ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES SHORT COLUMNS[J]. Engineering Mechanics, 2023, 40(5): 125-139. DOI: 10.6052/j.issn.1000-4750.2021.10.0827
Citation: ZHANG Xiu-fang, ZHANG Chi, LIU Rui-qiang. A STUDY ON SEISMIC PERFORMANCE OF STEEL REINFORCED ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES SHORT COLUMNS[J]. Engineering Mechanics, 2023, 40(5): 125-139. DOI: 10.6052/j.issn.1000-4750.2021.10.0827

型钢UHTCC短柱的抗震性能研究

A STUDY ON SEISMIC PERFORMANCE OF STEEL REINFORCED ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES SHORT COLUMNS

  • 摘要: 将具有良好控裂耗能能力和抗剥落性能的水泥基材料UHTCC应用于型钢混凝土SRC短柱,制作并完成了7个型钢-UHTCC(SUHTCC)短柱和1个SRC对比短柱的拟静力试验。试验主要变量为:配箍率、轴压比和翼缘栓钉布置。结果表明:UHTCC的使用可有效避免SRC短柱粘结裂缝的滋生,减缓剪切主裂缝的扩展,能够将SRC短柱的脆性剪切粘结混合破坏模式转变为延性较好的剪切破坏模式,大幅提升短柱的震后完整性;对SUHTCC短柱,增大配箍率对承载力几乎没有影响,但需确保箍筋最大间距以延缓粘结破坏,高配箍率的试件能显示出较好的峰后滞回曲线,具有较高的极限变形和耗能;轴压比对抗震破坏形态和力学性能影响较小,高轴压比下依然拥有较高的大变形能力和良好的抗震耗能;与型钢翼缘没有布置栓钉的SUHTCC试件相比,布置栓钉的SUHTCC短柱表现出更为饱满的峰前抗震滞回曲线,对峰前行为的影响较为显著,但峰后破坏加快导致延性降低。最后采用3种不同规范对SUHTCC短柱受剪承载力进行了预测,初步验证了现行JGJ 138−2016规范受剪承载力计算公式的适用性,并对SUHTCC短柱的剪切变形进行了定量分析,讨论了各参数对剪切变形的限制能力。

     

    Abstract: The ultra high toughness cementitious composites (UHTCC) material, with the super crack control ability, significant energy consumption and good anti-spalling property, has been applied to steel reinforced concrete (SRC) short columns as a replacement of plain concrete matrix. In this paper, seismic cyclic loading tests were carried out on seven steel reinforced UHTCC (SUHTCC) specimens and one reference steel reinforced concrete specimen. The main experimental parameters included the stirrup ratios, the axial load ratio and the arrangement of the studs on steel flange. Results show that the bond cracks and major shear cracks occurring in SRC columns may be effectively avoided or delayed with the use of UHTCC, and thus the brittle shear-bond failure mode in SRC specimen is well translated into the shear failure mode with improved ductility, resulting in a great improvement on post-earthquake integrality. For the SUHTCC specimens, the stirrup ratio shows less effect on shear capacity; however, maximum stirrup spacing should be ensured to delay the bond failure mode. Moreover, the SUHTCC specimens with higher stirrup ratios have better post-peak hysteretic curves, higher ultimate deformation and energy consumption. The axial load ratio shows little effect on seismic failure modes and mechanical performance of SUHTCC specimens. Large deformation capacity and high energy dissipation are obtained even under high axial load ratio. Compared with these SUHTCC specimens without studs, the SUHTCC specimens with studs exhibit better pre-peak hysteretic curves and much significant effect on pre-peak seismic behavior. However, after peak load, the SUHTCC specimens with studs encounter a quick failure, resulting in the decrease of ductility. At last, based on three different design codes, the shear capacity of the SUHTCC short columns was predicted. The applicability of current JGJ 138−2016 code was preliminarily verified. Besides, the shear deformation of SUHTCC short columns was analyzed quantitatively, and the influence of different parameters was also discussed.

     

/

返回文章
返回