不锈钢钢筋等截面替代RC梁撞击力学性能试验研究
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摘要
利用不锈钢钢筋等截面替代普通钢筋混凝土梁中的受力钢筋解决海洋环境中钢筋腐蚀等问题,采用国内先进的超高重型落锤冲击试验机系统对六根钢筋混凝土梁进行竖向抗冲击试验,采集撞击过程中的冲击作用力、试件测点的位移和应变,并进行分析.结果表明:(1)配筋率较小时(0.21%～0.58%),不锈钢钢筋等截面替代普通钢筋后能有效提高梁整体刚度及弹性恢复能力,降低结构变形,可采用不锈钢钢筋等截面替代普通钢筋解决钢筋腐蚀问题;(2)配筋率较大时(1.04%～2.20%),不锈钢钢筋等截面替代普通钢筋后延性较差,特别是冲击能量较高时,脆性性质更加明显.
Stainless steel bars of equal cross-section is used to replace steel bars in ordinary reinforced concrete beams to solve corrosion problems of steel bars in marine environment. The vertical impact test of six reinforced concrete beams was carried out by using the advanced impact testing system of ultra-high heavy weight drop hammer in China. The impact forces during the impact process,the displacement and strain of the measuring points of the specimens were collected and analyzed. The results show that:(1) when the reinforcement ratio is small(0. 21% ～ 0.58%),the stiffness and elastic recovery ability of the beam can be improved effectively after the replacement of the same section,and the deformation of the structure can be reduced. Stainless steel bars can be used to replace common steel bars to solve the corrosion problem.(2) when the reinforcement ratio is higher(1.04% ～ 2.20%),the ductility of stainless steel bar with equal cross-section is worse than that of ordinary steel bar,especially when the impact energy is high,and the brittleness becomes more obvious.
Stainless steel bars of equal cross-section is used to replace steel bars in ordinary reinforced concrete beams to solve corrosion problems of steel bars in marine environment. The vertical impact test of six reinforced concrete beams was carried out by using the advanced impact testing system of ultra-high heavy weight drop hammer in China. The impact forces during the impact process,the displacement and strain of the measuring points of the specimens were collected and analyzed. The results show that:(1) when the reinforcement ratio is small(0. 21% ～ 0.58%),the stiffness and elastic recovery ability of the beam can be improved effectively after the replacement of the same section,and the deformation of the structure can be reduced. Stainless steel bars can be used to replace common steel bars to solve the corrosion problem.(2) when the reinforcement ratio is higher(1.04% ～ 2.20%),the ductility of stainless steel bar with equal cross-section is worse than that of ordinary steel bar,especially when the impact energy is high,and the brittleness becomes more obvious.
引文
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[8]范向前,胡少伟,陆俊.不同配筋率对钢筋混凝土三点弯曲梁断裂韧度的影响[J].水电能源科学,2013,31(12):117-121.FAN Xiangqian,HU Shaowei,LU Jun.Effect of various reinforcement ratio on fracture toughness of reinforced concrete for three-points bending beams[J].Water Resources and Power,2013,31(12):117-121.
[9]沈培锋.配筋率对混凝土断裂参数的影响[J].防灾减灾工程学报,2013,33(2):235-240.SHEN Peifeng.Influence of reinforcement ratio on concrete fracture parameters[J].Journal of Disaster Prevention and Mitigation Engineering,2013,33(2):235-240.
[10]PHAM T M,HAO H.Prediction of the impact force on reinforced concrete beams from a drop weight[J].Advances in Structural Engineering,2016,19(11):1710-1722.
[2]SAATCI S,VECCHIO F J.Effects of shear mechanisms on impact behavior of reinforced concrete beams[J].ACI Structural Journal,2009,106(1):78-86.
[3]李砚召,王肖钧,郭晓辉,等.部分预应力混凝土梁抗冲击性能试验研究[J].爆炸与冲击,2006(3):256-261.LI Yanzhao,WANG Xiaojun,GUO Xiaohui,et al.Experimental study on anti-impact properties of a partially prestressed concrete beam[J].Explosion and Shock Waves,2006(3):256-261.
[4]许斌,曾翔.冲击荷载作用下钢筋混凝土梁性能试验研究[J].土木工程学报,2014,47(2):41-51,61.XU Bin,ZENG Xiang.Experimental study on the behaviors of reinforced concrete beams under impact loading[J].China Civil Engineering Journal,2014,47(2):41-51,61.
[5]曾翔,许斌.无腹筋钢筋混凝土梁抗冲击行为试验研究[J].土木工程学报,2012,45(9):63-73.ZENG Xiang,XU Bin.Experimental study on the impact-resistant behavior of RC beams without shear-resistant rebar[J].China Civil Engineering Journal,2012,45(9):63-73.
[6]许斌,曾翔.冲击作用下钢筋混凝土深梁动力性能试验研究[J].振动与冲击,2015,34(4):6-13,39.XU Bin,ZENG Xiang.Tests for dynamic behavior of deep RC beams under impact loadings[J].Journal of Vibration and Shock,2015,34(4):6-13,39.
[7]付应乾,董新龙.落锤冲击下钢筋混凝土梁响应及破坏的实验研究[J].中国科学:技术科学,2016,46(4):400-406.FU Yingqian,DONG Xinlong.An experimental study on impact response and failure behavior of reinforced concrete beam[J].Scientia Sinica Technologica,2016,46(4):400-406.
[8]范向前,胡少伟,陆俊.不同配筋率对钢筋混凝土三点弯曲梁断裂韧度的影响[J].水电能源科学,2013,31(12):117-121.FAN Xiangqian,HU Shaowei,LU Jun.Effect of various reinforcement ratio on fracture toughness of reinforced concrete for three-points bending beams[J].Water Resources and Power,2013,31(12):117-121.
[9]沈培锋.配筋率对混凝土断裂参数的影响[J].防灾减灾工程学报,2013,33(2):235-240.SHEN Peifeng.Influence of reinforcement ratio on concrete fracture parameters[J].Journal of Disaster Prevention and Mitigation Engineering,2013,33(2):235-240.
[10]PHAM T M,HAO H.Prediction of the impact force on reinforced concrete beams from a drop weight[J].Advances in Structural Engineering,2016,19(11):1710-1722.