加载速率对钢筋混凝土梁受剪性能影响的试验研究
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摘要
利用电液伺服试验系统,以位移控制的单调加载方式进行不同加载速率下18根钢筋混凝土梁受剪性能试验,加载速率分别为3.5×10~(-4) m/s、3.5×10~(-2) m/s和3.5×10~(-1) m/s,主要考察加载速率对钢筋混凝土梁破坏模式和荷载—位移曲线的影响。结果表明,随着加载速率的提高,梁的破坏形态出现了从纵向受拉钢筋屈服前的剪切破坏向弯剪破坏的转变,裂缝分布也发生了改变;材料应变率效应是梁的受剪承载力随加载速率提高而增大的主要原因,而惯性效应可以忽略。结合国外学者完成的54根梁的受剪试验结果进行分析发现,剪跨比较小的梁的受剪承载力随加载速率提高而增大的现象比剪跨比较大的梁更显著,且受剪承载力增大幅度总体上随配箍率的提高而减小。
By using an electro-hydraulic servo test system, tests for shear behaviors of 18 reinforced concrete(RC) beams at different loading rates were conducted with monotonic loading mode of displacement control. Loading rates were 3.5×10~(-4) m/s, 3.5×10~(-2) m/s and 3.5×10~(-1) m/s, respectively, and effects of loading rate on failure mode and load-displacement curve of RC beams were mainly observed. The test results indicated that with increase in loading rate, failure modes of beams have changes from shear failure of longitudinal tensile reinforcements before yield to their bending-shear failure, and distribution of cracks also has changes; the material strain rate effect is the main reason why shear-bearing capacity of beams increases with increase in loading rate, while the inertia effect can be neglected. Combining the shear test results of 54 beams conducted by scholars abroad, it was shown that the shear-bearing capacity's increasing of beams with smaller shear span ratio is more significant than that of beams with larger shear span ratio during loading rate rising; the increase amplitude of beams' shear-bearing capacity decreases with increase in stirrup ratio in general.
By using an electro-hydraulic servo test system, tests for shear behaviors of 18 reinforced concrete(RC) beams at different loading rates were conducted with monotonic loading mode of displacement control. Loading rates were 3.5×10~(-4) m/s, 3.5×10~(-2) m/s and 3.5×10~(-1) m/s, respectively, and effects of loading rate on failure mode and load-displacement curve of RC beams were mainly observed. The test results indicated that with increase in loading rate, failure modes of beams have changes from shear failure of longitudinal tensile reinforcements before yield to their bending-shear failure, and distribution of cracks also has changes; the material strain rate effect is the main reason why shear-bearing capacity of beams increases with increase in loading rate, while the inertia effect can be neglected. Combining the shear test results of 54 beams conducted by scholars abroad, it was shown that the shear-bearing capacity's increasing of beams with smaller shear span ratio is more significant than that of beams with larger shear span ratio during loading rate rising; the increase amplitude of beams' shear-bearing capacity decreases with increase in stirrup ratio in general.
引文
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[16] BISCHOFF P H,PERRY S H.Compressive behavior of concrete at high strain rates[J].Materials and Structures,1991,24(6):425-450.
[17] 林皋,闫东明,肖诗云,等.应变速率对混凝土特性及工程结构地震响应的影响[J].土木工程学报,2005,38(11):1-8.LIN Gao,YAN Dongming,XIAO Shiyun,ea tl.Strain rate effects on the behavior of concrete and the seismic response of concrete structures[J].China Civil Engineering Journal,2005,38(11):1-8.
[18] SHING P S B,MAHIN S A.Rate-of-loading effects on pseudodynamic tests[J].Journal of Structural Engineering,ASCE,1988,114(11):2403-2420.
[19] 李宏男,张宇,刘跃伟,等.钢筋混凝土构件动力加载试验数据库[J].建筑结构学报,2016,37(9):78-84.LI Hongnan,ZHANG Yu,LIU Yuewei.Database of reinforced concrete specimens under dynamic loading[J].Journal of Building Structures,2016,37(9):78-84.
[20] FUJIKAKE K,LI B,SOEUN S.Impact response of reinforced concrete beam and its analytical evaluation[J].Journal of Structural Engineering,ASCE,2009,135(8):938-950.
[2] MAHIN S A,BERTERO V V.Rate of loading effects on uncracked and repaired reinforced concrete members[R].Report EERC No.73-6,Berkeley:Earthquake Engineering Research Center,University of California,1972:1-15.
[3] TAKEDA J,TACHIKAWA H,FUJIAMOTO K.Effects of straining rate on deformation and fracture of reinforced concrete members[C].Proceedings of the Sixth World Conference on Earthquake Engineering.New Delhi,1977:32-56.
[4] MUTSUYOSHI H,MACHIDA A.Properties and failure of reinforced concrete members subjected to dynamic loading[J].Transactions of the Japan Concrete Institute,1984(6):521-528.
[5] KULKARNI S M,SHAH S P.Response of reinforced concrete beams at high rates[J].ACI Structural Journal,1998,95(6):705-715.
[6] OTANI S,KANEKO T,SHIOHARA H.Strain rate effect on performance of reinforced concrete members[C].Proceedings of fib Symposium on Concrete Structures in Seismic Regions.Athens,2003:983-995.
[7] ADHIKARY S D,LI B,FUJIKAKE K.Dynamic behavior of reinforced concrete beams under varying rates of concentrated loading[J].International Journal of Impact Engineering,2012,47:24-38.
[8] ADHIKARY S D,LI B,FUJIKAKE K.Strength and behavior in shear of reinforced concrete deep beams under dynamic loading conditions[J].Nuclear Engineering and Design,2013,259:14-28.
[9] ADHIKARY S D,LI B,FUJIKAKE K.Effects of high loading rate on reinforced concrete beams[J].ACI Structural Journal,2014,111(3):651-660.
[10] 李敏.材料的率相关性对钢筋混凝土结构动力性能的影响[D].大连:大连理工大学,2011.
[11] 肖诗云,曹闻博,潘浩浩.不同加载速率下钢筋混凝土梁力学性能试验研究[J].建筑结构学报,2012,33(12):142-146.XIAO Shiyun,CAO Wenbo,PAN Haohao.Experimental study on mechanical behavior of reinforced concrete beams at different loading rates[J].Journal of Building Structures,2012,33(12):142-146.
[12] 普通混凝土力学性能试验方法标准:GB/T 50081—2002[S].北京:中国建筑工业出版社,2003:12.
[13] 金属材料拉伸试验——第1部分:室温试验方法:GB/T 228.1—2010[S].北京:中国标准出版社,2010:888-890.
[14] 混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2010.
[15] 李敏,李宏男.建筑钢筋动力试验及本构模型[J].土木工程学报,2010,43(4):70-75.LI Min,LI Hongnan.Dynamic test and constitutive model for reinforceing steel[J].China Civil Engineering Journal,2010,43(4):70-75.
[16] BISCHOFF P H,PERRY S H.Compressive behavior of concrete at high strain rates[J].Materials and Structures,1991,24(6):425-450.
[17] 林皋,闫东明,肖诗云,等.应变速率对混凝土特性及工程结构地震响应的影响[J].土木工程学报,2005,38(11):1-8.LIN Gao,YAN Dongming,XIAO Shiyun,ea tl.Strain rate effects on the behavior of concrete and the seismic response of concrete structures[J].China Civil Engineering Journal,2005,38(11):1-8.
[18] SHING P S B,MAHIN S A.Rate-of-loading effects on pseudodynamic tests[J].Journal of Structural Engineering,ASCE,1988,114(11):2403-2420.
[19] 李宏男,张宇,刘跃伟,等.钢筋混凝土构件动力加载试验数据库[J].建筑结构学报,2016,37(9):78-84.LI Hongnan,ZHANG Yu,LIU Yuewei.Database of reinforced concrete specimens under dynamic loading[J].Journal of Building Structures,2016,37(9):78-84.
[20] FUJIKAKE K,LI B,SOEUN S.Impact response of reinforced concrete beam and its analytical evaluation[J].Journal of Structural Engineering,ASCE,2009,135(8):938-950.