Effect of Steel Fiber Content on Punching Shear Performance of Reinforced Concrete Slab
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摘要: 通过对钢纤维体积率为0和0.38%的双向板试件进行冲切试验，得到试件的破坏形态、钢筋和混凝土荷载-应变规律等，进而量化评估钢纤维掺量对钢筋混凝土桥面板冲切性能的影响。结果表明：钢纤维体积率为0与0.38%的试件相比，相同荷载作用下后者的钢筋、混凝土应变较小；首条裂缝的出现时间推迟；试件在冲切破坏时挠度变形较大且板底表面混凝土脱落较少。Abstract: In order to study the influence of steel fiber content on the punching performance of reinforced concrete slabs, we conducted the punching test of two-dimensional plate specimens with steel fiber volume fractions of 0 and 0.38%, and obtained the failure modes, the law of bars strains and concrete strains of the specimens. Then, we quantitatively evaluated the influence of steel fiber content on the punching performance of reinforced concrete slabs. The results show that comparing with the specimens with 0 and 0.38% steel fiber volume, the bars strains and concrete strains of the latter are less under the same load, and the first crack was delayed. The deflection of the specimen during punching failure is larger and less concrete on the bottom surface of the specimen shed.
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Key words:
- Punching strength /
- Steel fiber /
- Reinforced concrete slab /
- Destructive form
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图 3 试件底部混凝土应变片和位移计分布
Figure 3. Location of concrete strain gauges and displacement gauges
图 5 剥落板底松动混凝土后的破坏形态
Figure 5. Destruction form after peeling off the bottom of the board
表 1 板试主要参数
Table 1. Main parameters of the test piece
试件名 板边长/mm 支撑长度/mm 加载板边长/mm 板厚/mm 有效高度/mm 保护层厚度/mm 配筋率/% 钢纤维体积率/% 试块抗压强度/MPa 试块抗劈拉强度/MPa 混凝土强度 冲切强度/kN S-1 1500 1300 100 140 115 15 0.64 0 38.7 2.14 C30 308 G-1 1500 1300 100 140 115 15 0.64 0.38 35.62 2.95 C30 313 
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表 2 混凝土的配合比
Table 2. Concrete mix ratio
名称 水胶比 砂率 用量/kg·m-3 石子 砂 Ⅱ级粉煤灰 P·O 42.5R级水泥 水 泵送剂（聚羧酸） 混凝土 0.45 0.42 1 035 750 90 300 175 7.2
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高丹盈, 杨文涛, 谢晓鹏, 2008.钢纤维高强混凝土板冲切变形试验.工业建筑, 38(1):76-80. http://d.old.wanfangdata.com.cn/Periodical/gyjz200801019 何芳, 杨秋宁, 毛明杰, 2016.骨料粒径及抗压侧配筋量对钢筋混凝土板冲切强度的影响.宁夏大学学报(自然科学版), 37(4):452-456. doi: 10.3969/j.issn.0253-2328.2016.04.014 林旭健, 钱在兹, 郑作樵, 2003.钢纤维高强混凝土冲切板的挠度计算.工程力学, 20(6):23-27. doi: 10.3969/j.issn.1000-4750.2003.06.005 林旭健, 钱在兹, 郑作樵, 2004.钢纤维高强混凝土方形冲切板的变形与强度.土木工程学报, 37(12):23-28. doi: 10.3321/j.issn:1000-131X.2004.12.005 刘海燕, 2018.车载雷达检测混凝土桥面板损伤.世界桥梁, 46(4):93-94. 孙健婕, 杨秋宁, 毛明杰等, 2018.冲跨比对钢筋混凝土板冲切强度的影响.工业建筑, 48(2):84-88. http://d.old.wanfangdata.com.cn/Periodical/gyjz201802015 谢晓鹏, 高丹盈, 许洪春, 2009.钢筋局部钢纤维高强混凝土板冲切挠度计算.四川建筑科学研究, 35(5):36-39. http://d.old.wanfangdata.com.cn/Periodical/scjzkxyj200905011 杨秋宁, 毛明杰, 张文博, 2014.钢筋混凝土桥面板保护层厚度对冲切强度的影响.科技导报, 32(36):93-97. doi: 10.3981/j.issn.1000-7857.2014.36.015 中国工程建设标准化协会, 2005.CECS 38-2004纤维混凝土结构技术规程(附条文说明).北京: 中国计划出版社. Caldentey A. P., Lavaselli P. P., Peiretti H. C., et al., 2013. Influence of stirrup detailing on punching shear strength of flat slabs. Engineering Structures, 49:855-865. doi: 10.1016/j.engstruct.2012.12.032 Maya L. F., Ruiz M. F., Muttoni A., et al., 2012. Punching shear strength of steel fibre reinforced concrete slabs. Engineering Structures, 40:83-94. doi: 10.1016/j.engstruct.2012.02.009 -
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