冲击作用下钢筋混凝土深梁动力性能试验研究
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摘要
为了探讨在冲击荷载作用下钢筋混凝土深梁的动力性能,利用大型落锤试验机对两组具有不同静载破坏特性的简支钢筋混凝土深梁进行了不同冲击速度下的动力性能试验研究,并考虑了二次冲击的影响。通过对高速摄像机所记录的各试件在冲击过程中裂缝的发生、发展直至试件破坏的全过程进行分析和不同荷载下裂缝形态差异的对比分析,表明不同的冲击速度下试件裂缝的发生、发展过程及裂缝形态表现出明显的差异,二次冲击下的主要裂缝基本遵循一次冲击产生的裂缝路径发展。详细分析了冲击力和跨中位移时程曲线以及冲击力-跨中位移曲线的特征,发现冲击力峰值与冲击速度、最大跨中位移和跨中残余位移与冲击速度在不发生严重剪切破坏时均满足近似线性关系。分析还表明,具有较好延性的深梁具有更好的抗冲击性能。最后,通过对比分析冲击力、支座反力和惯性力时程曲线,得出采用冲击力峰值和支座反力峰值作为深梁的抗冲击承载力均不准确的结论。
In order to understand the dynamic behaviors of deep reinforced concrete( RC) beams under impact loadings,falling-weight impact tests for two groups of simply-supported deep RC beams with different static behaviors were conducted and the effects of impact velocity and the second impact on the impact-resistant behavior of deep RC beams were investigated. By analyzing crack initiation,propagation and failure process of specimens recorded using a high-speed video camera and comparing crack patterns of specimens under different loadings,it was found that crack initiation,propagation,failure process and crack patterns are affected obviously by impact velocity,and the major crack development under the second impact mainly follows the crack path induced by the first impact loading. The characteristics of time histories of impact force and mid-span displacement and the impact force versus mid-span displacement curves were analyzed in details,it was shown that the maximum impact force,the maximum mid-span deflection,and the residual mid-span deflection change approximately linearly with impact velocity for specimens without serious shear failure;moreover,the specimens with better ductility have better impact-resistant behaviors. Finally,by analyzing the time histories of impact force,support reaction force and inertia force,it was concluded that taking the maximum impact force or the maximum support reaction force as the impact-resistant loading capacity is incorrect.
In order to understand the dynamic behaviors of deep reinforced concrete( RC) beams under impact loadings,falling-weight impact tests for two groups of simply-supported deep RC beams with different static behaviors were conducted and the effects of impact velocity and the second impact on the impact-resistant behavior of deep RC beams were investigated. By analyzing crack initiation,propagation and failure process of specimens recorded using a high-speed video camera and comparing crack patterns of specimens under different loadings,it was found that crack initiation,propagation,failure process and crack patterns are affected obviously by impact velocity,and the major crack development under the second impact mainly follows the crack path induced by the first impact loading. The characteristics of time histories of impact force and mid-span displacement and the impact force versus mid-span displacement curves were analyzed in details,it was shown that the maximum impact force,the maximum mid-span deflection,and the residual mid-span deflection change approximately linearly with impact velocity for specimens without serious shear failure;moreover,the specimens with better ductility have better impact-resistant behaviors. Finally,by analyzing the time histories of impact force,support reaction force and inertia force,it was concluded that taking the maximum impact force or the maximum support reaction force as the impact-resistant loading capacity is incorrect.
引文
[1]GB 50010-2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.
[2]ACI Committee 318.Building Code Requirements for Structural Concrete(ACI318-08)and Commentary(ACI 318R-08)[S].Detroit:American Concrete Institute,2008.
[3]British Standard Institute.BS EN1992-1-1:2004 Eurocode 2:Design of Concrete Structures-Part 1-1:General Rules and Rules for Buildings[S].London:British Standard Institute,2004.
[4]CSA Technical Committee on reinforced concrete design,A23.3-04.Design of concrete structures[S].Ontario,Canada:Canadian Standards Association,2004.
[5]Austin W J,Egger W,Untrauer R E,et al.An investigation of the behavior of deep members of reinforced concrete and steel[R].Civil Engineering Studies SRS-187.Urbana:University of Illinois at Urbana-Champaign,1960.
[6]Untrauer R E.Behavior and design of deep structural members part 4:dynamic tests of reinforced concrete deep beams[R].Civil Engineering Studies SRS-195.Urbana:University of Illinois at Urbana-Champaign,1960.
[7]Untrauer R E,Siess C P.Strength and behavior in flexure of deep reinforced concrete beams under static and dynamic loading[R].Urbana:University of Illinois at UrbanaChampaign,1961.
[8]De Paiva H A R,Siess C P.Strength and behavior in shear of deep reinforced concrete beams under static and dynamic loading Vol.2:strength and behavior in shear[R].Civil Engineering Studies SRS-231.Urbana:University of Illinois at Urbana-Champaign,1961.
[9]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 Dong-ming,XIAO Shi-yun,et al.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.
[10]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,2013,259:14-23.
[11]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):1-12.XU Bin,ZENG Xiang.Experimental study on the behaviors of reinforced concrete beams under impact loadings[J].China Civil Engineering Journal,2014,47(2):1-12.
[12]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.
[13]Saatci S,Vecchio F.Effects of shear mechanisms on impact behavior of reinforced concrete beams[J].ACI Structural Journal,2009,106(1):78-86.
[14]Chen Y,May I M.Reinforced concrete members under dropweight impacts[J].Structures and Buildings,2009,162(1):45-62.
[15]Kishi N,Mikami H,Matsuoka K G,Ando T.Impact behavior of shear-failure-type RC beams without shear rebar[J].International Journal of Impact Engineering,2002,27(9):655-968.
[16]Kishi N,Nakano O,Matsuoka K G,et al.Experimental study on ultimate strength of flexural-failure-type RC beams under impact loading[C]//Transactions of 16th International Conference on Structural Mechanics in Reactor Techology,Washton DC,2001.
[17]Mylrea T D.Effect of impact on reinforced concrete beams[J].ACI Journal Proceedings,1940,36(6):58-59.
[2]ACI Committee 318.Building Code Requirements for Structural Concrete(ACI318-08)and Commentary(ACI 318R-08)[S].Detroit:American Concrete Institute,2008.
[3]British Standard Institute.BS EN1992-1-1:2004 Eurocode 2:Design of Concrete Structures-Part 1-1:General Rules and Rules for Buildings[S].London:British Standard Institute,2004.
[4]CSA Technical Committee on reinforced concrete design,A23.3-04.Design of concrete structures[S].Ontario,Canada:Canadian Standards Association,2004.
[5]Austin W J,Egger W,Untrauer R E,et al.An investigation of the behavior of deep members of reinforced concrete and steel[R].Civil Engineering Studies SRS-187.Urbana:University of Illinois at Urbana-Champaign,1960.
[6]Untrauer R E.Behavior and design of deep structural members part 4:dynamic tests of reinforced concrete deep beams[R].Civil Engineering Studies SRS-195.Urbana:University of Illinois at Urbana-Champaign,1960.
[7]Untrauer R E,Siess C P.Strength and behavior in flexure of deep reinforced concrete beams under static and dynamic loading[R].Urbana:University of Illinois at UrbanaChampaign,1961.
[8]De Paiva H A R,Siess C P.Strength and behavior in shear of deep reinforced concrete beams under static and dynamic loading Vol.2:strength and behavior in shear[R].Civil Engineering Studies SRS-231.Urbana:University of Illinois at Urbana-Champaign,1961.
[9]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 Dong-ming,XIAO Shi-yun,et al.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.
[10]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,2013,259:14-23.
[11]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):1-12.XU Bin,ZENG Xiang.Experimental study on the behaviors of reinforced concrete beams under impact loadings[J].China Civil Engineering Journal,2014,47(2):1-12.
[12]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.
[13]Saatci S,Vecchio F.Effects of shear mechanisms on impact behavior of reinforced concrete beams[J].ACI Structural Journal,2009,106(1):78-86.
[14]Chen Y,May I M.Reinforced concrete members under dropweight impacts[J].Structures and Buildings,2009,162(1):45-62.
[15]Kishi N,Mikami H,Matsuoka K G,Ando T.Impact behavior of shear-failure-type RC beams without shear rebar[J].International Journal of Impact Engineering,2002,27(9):655-968.
[16]Kishi N,Nakano O,Matsuoka K G,et al.Experimental study on ultimate strength of flexural-failure-type RC beams under impact loading[C]//Transactions of 16th International Conference on Structural Mechanics in Reactor Techology,Washton DC,2001.
[17]Mylrea T D.Effect of impact on reinforced concrete beams[J].ACI Journal Proceedings,1940,36(6):58-59.
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