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钢纤维沙漠砂混凝土梁受弯力学性能试验

秦拥军 张亮亮 渠长伟 罗玲

秦拥军, 张亮亮, 渠长伟, 等. 钢纤维沙漠砂混凝土梁受弯力学性能试验[J]. 复合材料学报, 2021, 39(0): 1-12
引用本文: 秦拥军, 张亮亮, 渠长伟, 等. 钢纤维沙漠砂混凝土梁受弯力学性能试验[J]. 复合材料学报, 2021, 39(0): 1-12
Yongjun QIN, Liangliang ZHANG, Changwei QU, Ling LUO. Experimental study on flexural mechanical properties of steel fiber desert sand concrete beams[J]. Acta Materiae Compositae Sinica.
Citation: Yongjun QIN, Liangliang ZHANG, Changwei QU, Ling LUO. Experimental study on flexural mechanical properties of steel fiber desert sand concrete beams[J]. Acta Materiae Compositae Sinica.

钢纤维沙漠砂混凝土梁受弯力学性能试验

基金项目: 国家自然科学基金(51668060);自治区高校科研计划自然科学项目(XJEDU2017I003);兵团科技攻关项目(2019DB004)
详细信息
    通讯作者:

    张亮亮,硕士研究生,研究方向为土木工程材料 E-mail: 2902337569@qq.com

  • 中图分类号: TU528.52

Experimental study on flexural mechanical properties of steel fiber desert sand concrete beams

  • 摘要: 适量沙漠砂作为细骨料制备混凝土可有效提高混凝土的抗压强度,而钢纤维的掺入对混凝土抗拉性能有显著的提升作用。为探究钢纤维沙漠砂混凝土梁受弯力学特性,设计11根试验梁,分别研究钢纤维体积掺量、沙漠砂替代率和配筋率对受弯梁的影响规律。试验研究表明,钢纤维沙漠砂混凝土梁相对于普通混凝土梁其受弯承载力提高了4%~22%,受弯梁裂缝数量随钢纤维掺量增加呈现降低趋势,钢纤维减小了混凝土表面的弹塑性变形,而“桥架作用”抑制了裂缝的产生和提高了试验梁的承载力;随着配筋率的增加,主裂缝宽度呈减小的趋势,但极限荷载则逐渐增加,表明配筋率是影响受弯梁承载力主要因素之一;沙漠砂的“填充作用”密实了混凝土,使构件整体性能呈现良好的状态。试验梁的开裂荷载、修正后的极限弯矩理论计算值和试验值吻合效果良好,误差均小于5%。沙漠砂替代工程用砂制备混凝土,可以充分发挥当地资源优势,节约河砂资源,保护河湖生态环境,达到绿色建筑目标。

     

  • 图  1  试验加载装置示意图

    Figure  1.  Test loading device schematic diagram

    图  2  部分钢纤维退出工作图

    Figure  2.  Exit work diagram of partial steel fiber

    图  3  破坏阶段钢筋、钢纤维状态

    Figure  3.  State of steel bar and steel fiber in failure stage

    图  4  钢纤维沙漠砂混凝土梁破坏状态

    Figure  4.  Failure states of steel fiber desert sand concrete beams

    图  5  Rds=20%时钢纤维沙漠砂混凝土梁荷载-位移曲线

    Figure  5.  Load-displacement curve of steel fiber desert sand concrete beam with Rds = 20 %

    图  6  Rds=40%钢纤维沙漠砂混凝土梁荷载-位移曲线

    Figure  6.  Load-displacement curve of steel fiber desert sand concrete beam with Rds = 40 %

    图  7  Vsf=0.5%时钢纤维沙漠砂混凝土梁荷载-位移曲线

    Figure  7.  Load-displacement curve of steel fiber reinforced desert sand concrete beam with Vsf = 0.5 %

    图  10  Vsf=2.0%时钢纤维沙漠砂混凝土梁荷载-位移曲线

    Figure  10.  Load-displacement curve of steel fiber reinforced desert sand concrete beam with Vsf=2.0%

    图  8  Vsf=1.0%时钢纤维沙漠砂混凝土梁荷载-位移曲线

    Figure  8.  Load-displacement curve of steel fiber reinforced desert sand concrete beam with Vsf=1.0%

    图  9  Vsf=1.5%时钢纤维沙漠砂混凝土梁荷载-位移曲线

    Figure  9.  Load-displacement curve of steel fiber reinforced desert sand concrete beam with Vsf=1.5%

    图  11  Vsf=1.0%,Rds=40%时钢纤维沙漠砂混凝土梁荷载-位移曲线

    Figure  11.  Load - displacement curve of steel fiber desert sand concrete beam with Vsf = 1.0 % and Rds = 40 %

    图  12  考虑到Rds钢纤维沙漠砂混凝土梁拟合曲线

    Figure  12.  Fitting curve of desert sand concrete beams considering Rds steel fiber

    表  1  钢纤维尺寸及力学性能

    Table  1.   Steel fiber size and mechanical properties

    TypeL0/mmLf/mmDf/umL0/DfFtk/MPa
    End hook type353875046.71000
    Notes:L0 is the effective length; Lf is the total length; Df is the equivalent diameter; L0/Df is the length-diameter ratio;Ftk is the tensile strength.
    下载: 导出CSV

    表  2  钢纤维沙漠砂混凝土梁参数

    Table  2.   Parameters of steel fiber desert sand concrete beams

    Numberb*h/mm2h0/mmL/mmL0/mmVsf/%Rds/%LrRr/%
    SF/DSC-0/0-0.97150*300259180015000.002160.97
    SF/DSC-0.5/20-0.97150*300259180015000.5202160.97
    SF/DSC-1.0/20-0.97150*300259180015001.0202160.97
    SF/DSC-1.5/20-0.97150*300259180015001.5202160.97
    SF/DSC-2.0/20-0.97150*300259180015002.0202160.97
    SF/DSC-0.5/40-0.97150*300259180015000.5402160.97
    SF/DSC-1.0/40-0.97150*300259180015001.0402160.97
    SF/DSC-1.5/40-0.97150*300259180015001.5402160.97
    SF/DSC-2.0/40-0.97150*300259180015002.0402160.97
    SF/DSC-1.0/40-1.23150*300259180015001.0402181.23
    SF/DSC-1.0/40-1.52150*300259180015001.0402201.52
    Notes:b means beam width; h means beam height; h0 is the effective height; L—Beam length; VsfVolume content of steel fiber; Rds—Replacement rate of desert sand; Lr means longitudinal reinforcement; Rr—Reinforcement ratio; SF—Steel fiber; DSC—Desert sand concrete; for example, in SF/DSC-1.0/40-1.23, 1.0/40 represent the contents of steel fiber and desert sand, 1.23 represents reinforcement ratio.
    下载: 导出CSV

    表  3  钢纤维沙漠砂混凝土梁基本力学性能

    Table  3.   Basic mechanical properties of steel fiber desert sand concrete beams

    NumberVsf/%Rds/%Rr/%fcc/MPafts /MPa$ {f}_{\mathrm{t}\mathrm{k}}({f}_{\mathrm{f}\mathrm{t}\mathrm{k}}) $/MPaEC($ {E}_{\mathrm{s}\mathrm{f}\mathrm{r}\mathrm{c}} $)/GPa
    SF/DSC-0/0-0.970.000.9746.004.213.7933.85
    SF/DSC-0.5/20-0.970.5200.9752.675.275.0234.73
    SF/DSC-1.0/20-0.971.0200.9756.796.635.8335.61
    SF/DSC-1.5/20-0.971.5200.9752.127.946.6434.60
    SF/DSC-2.0/20-0.972.0200.9750.458.197.4534.23
    SF/DSC-0.5/40-0.970.5400.9758.716.165.0236.01
    SF/DSC-1.0/40-0.971.0400.9755.647.095.8335.37
    SF/DSC-1.5/40-0.971.5400.9753.828.266.6434.98
    SF/DSC-2.0/40-0.972.0400.9752.878.927.4534.77
    SF/DSC-1.0/40-1.231.0401.2355.327.155.8335.30
    SF/DSC-1.0/40-1.521.0401.5255.467.065.8335.33
    下载: 导出CSV

    表  4  钢纤维沙漠砂混凝土梁开裂荷载

    Table  4.   Cracking load of steel fiber desert sand concrete beams

    NumberVsf/%Rds/%Rr/%Pcr/KNMcr/(kN·m)Mcr0/(kN·m)Mcr/Mcr0
    SF/DSC-0/0-0.970.000.9744.7511.1910.791.037
    SF/DSC-0.5/20-0.970.5200.9751.0912.7712.840.995
    SF/DSC-1.0/20-0.971.0200.9759.9514.9914.861.009
    SF/DSC-1.5/20-0.971.5200.9767.0516.7616.980.987
    SF/DSC-2.0/20-0.972.0200.9776.3619.0919.071.001
    SF/DSC-0.5/40-0.970.5400.9750.3712.5912.780.985
    SF/DSC-1.0/40-0.971.0400.9760.0015.0014.871.009
    SF/DSC-1.5/40-0.971.5400.9778.2619.5716.961.154
    SF/DSC-2.0/40-0.972.0400.9776.2419.0619.041.001
    SF/DSC-1.0/40-1.231.0401.2359.9915.0015.380.975
    SF/DSC-1.0/40-1.521.0401.5264.3316.0815.991.006
    Notes:Pcr is cracking load; Mcr is the experimental value of bending beam cracking load; Mcr0 is the theoretical calculation value of bending beam cracking load.
    下载: 导出CSV

    表  5  钢纤维沙漠砂混凝土梁承载力实测值与计算值比较

    Table  5.   Comparison of measured and calculated bearing capacity of steel fiber desert sand concrete beams

    NumberVsf/%Rds/%Rr/%Pmax/kNMu/(kN·m)Mu0/(kN·m)Mu/Mu0
    SF/DSC-0/0-0.970.000.97194.0148.5034.741.396
    SF/DSC-0.5/20-0.970.5200.97201.7750.4439.161.288
    SF/DSC-1.0/20-0.971.0200.97214.1153.5343.211.239
    SF/DSC-1.5/20-0.971.5200.97223.8955.9746.991.191
    SF/DSC-2.0/20-0.972.0200.97229.9057.4850.461.139
    SF/DSC-0.5/40-0.970.5400.97216.2554.0639.161.381
    SF/DSC-1.0/40-0.971.0400.97234.3558.5943.211.356
    SF/DSC-1.5/40-0.971.5400.97236.5159.1346.991.258
    SF/DSC-2.0/40-0.972.0400.97229.9957.5050.461.139
    SF/DSC-1.0/40-1.231.0401.23241.9160.4850.371.201
    SF/DSC-1.0/40-1.521.0401.52312.0978.0258.171.341
    Notes:Pmax is the maximum load; Mu is the experimental value of ultimate load of bending beam; Mu0 is the theoretical calculation value of ultimate load of bending beam.
    下载: 导出CSV

    表  6  钢纤维沙漠砂混凝土梁修正理论值和试验值

    Table  6.   Modified theoretical and experimental values of steel fiber desert sand concrete beams

    NumberVsf/%Rds/%Rr/%Pmax/kNMu/(kN·m)M´/(kN·m)Mu/M´
    SF/DSC-0/00.000.97194.0148.5047.041.031
    SF/DSC-0.5/200.5200.97201.7750.4450.830.992
    SF/DSC-1.0/201.0200.97214.1153.5356.090.954
    SF/DSC-1.5/201.5200.97223.8955.9760.990.918
    SF/DSC-2.0/202.0200.97229.9057.4865.500.878
    SF/DSC-0.5/400.5400.97216.2554.0648.641.112
    SF/DSC-1.0/401.0400.97234.3558.5953.671.092
    SF/DSC-1.5/401.5400.97236.5159.1358.361.013
    SF/DSC-2.0/402.0400.97229.9957.5062.670.917
    SF/DSC-1.0/40-1.231.0401.23241.9160.4862.560.967
    SF/DSC-1.0/40-1.521.0401.52312.0978.0272.251.080
    Notes:M ' is the modified theoretical calculation value of ultimate load of bending beam.
    下载: 导出CSV

    表  7  钢纤维沙漠砂混凝土梁刚度和挠度

    Table  7.   Steel fiber desert sand concrete beams stiffness and deflection

    NumberVsf/%Rds/%Rr/%Bfs/(N·mm2)f /mmf0 /mmf0 / f
    SF/DSC-0/0-0.970.000.9745415869126132.562.811.098
    SF/DSC-0.5/20-0.970.5200.9749827436689532.432.771.142
    SF/DSC-1.0/20-0.971.0200.9754303967366482.362.711.147
    SF/DSC-1.5/20-0.971.5200.9757884063597282.322.601.122
    SF/DSC-2.0/20-0.972.0200.9761729746020272.232.491.116
    SF/DSC-0.5/40-0.970.5400.9750370738618732.572.751.069
    SF/DSC-1.0/40-0.971.0400.9754194317591442.592.811.085
    SF/DSC-1.5/40-0.971.5400.9758076005783862.442.671.094
    SF/DSC-2.0/40-0.972.0400.9762025009106782.222.501.125
    SF/DSC-1.0/40-1.231.0401.2359013059184172.462.731.112
    SF/DSC-1.0/40-1.521.0401.5264750975723562.893.001.039
    Notes:f is the experimental value of bending beam deflection; f0 is the theoretical calculation value of bending beam deflection; Bfs is the short-term stiffness of bending beam.
    下载: 导出CSV

    表  8  钢纤维沙漠砂混凝土待测梁的参数

    Table  8.   Parameters of steel fiber desert sand concrete beam to be tested

    Numberb*h/mmh0/mmL0/mmVsf/%Rds/%Rr/%fcc/MPafts /MPa
    SF/DSC-0/40-0.97150*30025915000.0400.9747.44.49
    SF/DSC-0.5/60-0.97150*30025915000.5600.9751.16.62
    SF/DSC-1.0/60-0.97150*30025915001.0600.9750.06.60
    SF/DSC-1.5/60-0.97150*30025915001.5600.9748.66.62
    SF/DSC-2.0/60-0.97150*30025915002.0600.9748.17.30
    下载: 导出CSV

    表  9  钢纤维沙漠砂混凝土待测梁的力学性能

    Table  9.   Mechanical properties of steel fiber desert sand concrete beams

    NumberVsf/%Rds/%Ec($ {E}_{\mathrm{s}\mathrm{f}\mathrm{r}\mathrm{c}} $)/GPaMcr/(kN·m)M´/(kN·m)Bfs/(N·mm2)f/mm
    SF/DSC-0/40-0.970.04034.1111.4843.2645523053795402.28
    SF/DSC-0.5/60-0.970.56034.3812.8346.4249673986557272.24
    SF/DSC-1.0/60-0.971.06034.1314.9251.2653610772554352.29
    SF/DSC-1.5/60-0.971.56033.8117.0155.6957475486066082.32
    SF/DSC-2.0/60-0.972.06033.6919.0959.8361427951029062.33
    下载: 导出CSV
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    [21] CECS 13-2009. 纤维混凝土试验方法标准[S]. 北京: 中国计划出版社, 2010

    CECS 13 - 2009. Standard Test Methods for Fiber Reinforced Concrete [S]. Beijing: China Plan Press, 2010(in Chinese).
    [22] CEB-FIP fib Model code for concrete structures 2010[S]. Switzerland: International Federation for Structural Concrete, 2013.
    [23] CECS 38-2004. 纤维混凝土结构技术规程[S]. 北京: 中国计划出版社, 2004

    CECS 38 - 2004. Technical specification for fiber reinforced concrete structures [S]. Beijing: China Plan Press, 2004(in Chinese).
    [24] 管巧艳. 钢筋钢纤维高强混凝土梁受弯性能研究[D]. 郑州大学, 2005

    GUAN Q Y. Study on flexural behavior of steel fiber reinforced high strength concrete beams [D]. Zhengzhou University, 2005(in Chinese).
    [25] GB/T 50010-2010. 混凝土结构设计规范[S]. 北京: 中国建筑工业出版社, 2010

    TGB / T 50010 - 2010. Code for design of concrete structures [S]. Beijing: China Construction Industry Press, 2010(in Chinese).
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出版历程
  • 收稿日期:  2021-10-19
  • 录用日期:  2021-11-26
  • 修回日期:  2021-11-25
  • 网络出版日期:  2021-12-23

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