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| Tests for effects of loading rate on shear behaviors of RC beams |
| YUAN Jian1, YI Weijian2 |
1. College of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
2. College of Civil Engineering, Hunan University, Changsha 410082, China |
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Abstract 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.
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Received: 11 May 2018
Published: 28 March 2019
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[1] Ghannoum W, Saouma V, Haussmann G, et al. Experimental investigations of loading rate effects in reinforced concrete columns[J]. Journal of Structural Engineering, ASCE, 2012,138(8): 1032-1041.
[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.
LI Min.Effects of rate-dependent properties of material on dynamic properties of reinforced concrete structures[D]. Dalian:Dalian University of technology, 2011. (in Chinese)
[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. (in Chinese)
[12] GB/T 50081-2002 普通混凝土力学性能试验方法标准[S]. 北京:中国建筑工业出版社,2003:12.(GB/T 50081-2002 Standard for test method of mechanical properties on ordinary concrete [S]. Beijing: China Architecture Industry Press, 2003:12.(in Chinese))
[13] GB/T 228.1-2010 金属材料拉伸试验——第1部分:室温试验方法[S].北京:中国标准出版社,2010:888-890.
GB/T 228.1-2010 Metallic materials——Tensile testing-Part1: Method of test at room temperature[S]. Beijing: China Standards Press, 2010:888-890.(in Chinese)
[14] GB 50010-2010混凝土结构设计规范[S]. 北京：中国建筑工业出版社,2010:25.
GB 50010-2010 Code for design of concrete structures[S]. Beijing: China Architecture Industry Press,2010: 25.(in Chinese)
[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.(in Chinese)
[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):1-8,63.
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):1-8,63.
[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 Yue-wei. Database of reinforced concrete specimens under dynamic loading [J]. Journal of Building Structures, 2016,37(9):78-84.(in Chinese)
[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.
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