跨高比l/h≤1.5钢筋钢纤维混凝土连梁受剪性能分析
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摘要
小跨高比连梁在地震作用下易于发生剪切破坏,为了研究小跨高比钢筋钢纤维混凝土连梁的受剪性能,对低周水平反复荷载作用下的跨高比l/h≤1.5钢筋钢纤维混凝土连梁的试验结果进行了分析.运用拉压杆模型理论,分析了跨高比l/h≤1.5钢筋钢纤维混凝土连梁的受剪机理,提出了受剪承载力的计算模型和计算方法.研究结果表明:跨高比l/h≤1.5的钢筋钢纤维混凝土连梁主要通过对角混凝土主斜压杆机制与竖向拉压杆机制传递梁端剪力,其中竖向拉压杆机制由钢筋钢纤维拉杆与混凝土次斜压杆组成.基于拉压杆模型计算方法得到的受剪承载力计算值与试验值吻合较好,采用该计算方法能够较为准确的预测跨高比l/h≤1.5的钢筋钢纤维混凝土连梁的受剪承载力.
Coupling beams with small span-to-depth ratio are prone to fail due to shear effect under seismic action.To study the shear performance of steel fiber reinforced concrete(SFRC) coupling beams with small span-to-depth ratio,the experimental results of SFRC coupling beams with span-to-depth ratio l/h≤1.5 under lateral reverse cyclic load were analyzed.The shear mechanism of SFRC coupling beams with span-to-depth ratio l/h≤1.5 was analyzed by using strut-and-tie model theory,and the calculation model and corresponding calculation method were also proposed to predict the shear capacity.The results show that the shear forces of SFRC coupling beams with span-to-depth ratio l/h≤1.5 are mainly transmitted by diagonal concrete strut mechanism and vertical mechanism which consist of reinforcement and steel fiber ties and secondary concrete compressive struts.The calculated values of shear capacity based on the strut-and-tie method agree well with the test ones,which indicate that the proposed calculation method can predict the shear capacity of SFRC coupling beams with span-to-depth ratio l/h≤1.5 precisely.
Coupling beams with small span-to-depth ratio are prone to fail due to shear effect under seismic action.To study the shear performance of steel fiber reinforced concrete(SFRC) coupling beams with small span-to-depth ratio,the experimental results of SFRC coupling beams with span-to-depth ratio l/h≤1.5 under lateral reverse cyclic load were analyzed.The shear mechanism of SFRC coupling beams with span-to-depth ratio l/h≤1.5 was analyzed by using strut-and-tie model theory,and the calculation model and corresponding calculation method were also proposed to predict the shear capacity.The results show that the shear forces of SFRC coupling beams with span-to-depth ratio l/h≤1.5 are mainly transmitted by diagonal concrete strut mechanism and vertical mechanism which consist of reinforcement and steel fiber ties and secondary concrete compressive struts.The calculated values of shear capacity based on the strut-and-tie method agree well with the test ones,which indicate that the proposed calculation method can predict the shear capacity of SFRC coupling beams with span-to-depth ratio l/h≤1.5 precisely.
引文
[1] 李方圆,梁兴文,张涛.剪力墙结构小跨高比连梁研究述评[J].建筑结构,2008,(增1):152-155 Li Fangyuan,Liang Xingwen,Zhang Tao.Review for the researches on coupling beams with small span-to-depth ratios in shear walls[J].Journal of Building Structure,2008,(S1):152-155
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[10] 魏巍巍,贡金鑫.按我国规范的压杆-拉杆设计方法[J].建筑结构,2008,29(增1):287-293 Wei Weiwei,Gong Jinxin.Strut-and-tie design method based on Chinese code[J].Journal of Building Structure,2008,29(S1):287-293
[11] 张文学,李建中,龙佩恒.拉-压杆模型合理性量化评价指标研究[J].工程力学,2009,26(5):52-57 Zhang Wenxue,Li Jianzhong,Long Peiheng.Quantification index research for the rationality of strut-and-tie model[J].Engineering Mechanics,2009,26(5):52-57
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[14] Zhao Z Z,Kwan A K H,He X G.Nonlinear finite element analysis of deep reinforced concrete coupling beams[J].Engineering Structures,2004,26(1):13-25
[15] 赵顺波,李凤兰,赵国藩,等.钢筋钢纤维混凝土梁的斜截面承载力[J].应用基础与工程科学学报,1998,6(1):81-86 Zhao Shunbo,Li Fenglan,Zhao Guofan et al.Shear resistance of steel fiber reinforced concrete beams[J].Journal of Basic Science and Engineering,1998,6(1):81-86
[16] Schlaich J,Sch?fer K,Jennewein M.Toward a consistent design of structural concrete[J].PCI Journal,1987,32(3):74-150
[17] Paulay T,Binney J.Diagonally reinforced coupling beams of shear walls[J].ACI Special Publication,1974,42(2):579-598
[18] Hwang S J,Lu W Y,Lee H J.Shear strength prediction for deep beams[J].ACI Structure Journal,2000,97(3):367-376
[19] Thomas T C H,Mo Y L.Unified theory of concrete structures[M].Chichester:Wiley Press,2010:78-80
[20] 邢国华,刘伯权,吴涛.基于软化拉-压杆模型的钢筋混凝土框架节点受剪分析[J].建筑结构,2011,32(5):125-134 Xing Guohua,Liu Boquan,Wu Tao.Shear strength of reinforced concrete frame joints using softened strut and tie model[J].Journal of Building Structures,2011,32(5):125-134
[21] 高丹盈,史科,赵顺波.基于软化拉压杆模型的钢筋钢纤维混凝土梁柱节点受剪承载力计算方法[J].土木工程学报,2014,47(9):101-109 Gao Danying,Shi Ke,Zhao Shunbo.Calculation method for shear capacity of steel fiber reinforced concrete beam-column joints based on softened strut-and-tie model[J].China Civil Engineering Journal,2014,47(9):101-109
[22] 刘清山,梁兴文.抗震剪力墙小跨高比连梁受剪承载力的软化拉压杆模型解[J].建筑科学,2009,24(7):5-9 Liu Qingshan,Liang Xingwen.The softening strut-and-tie model method for calculation of shear bearing capacity of deep coupling beams[J].Building Science,2009,24(7):5-9
[23] Ng T,Htut T,Foster S J.Fracture of steel fibre reinforced concrete-the unified variable engagement model[D].Sydney:The University of New South Wales,2012
[24] 张宏战.钢纤维高强混凝土构件受剪性能试验研究[D].大连:大连理工大学,2005 Zhang Hongzhan.Experimental study on shear resistance properties of steel fiber reinforced high-strength concrete members[D].Dalian:Dalian University of Technology,2005
[25] 龚炳年,方鄂华.反复荷载下联肢剪力墙结构连系梁的性能[J].建筑结构学报,1988,9(1):34-41 Gong Bingnian,Fang Ehua.Behavior of reinforced concrete coupling Beams between Shear walls under cyclic loading[J].Journal of Building Structures,1988,9(1):34-41
[2] 刘清山,梁兴文.普通配筋小跨高比连梁的受剪承载力分析[J].建筑结构,2006,36(12):8-12 Liu Qingshan,Liang Xingwen.Shear carrying capacity analysis of coupling beams with small aspect ratio[J].Journal of Building Structure,2006,36(12):8-12
[3] 傅剑平,陈京洲,皮天祥,等.新型配筋小跨高比洞口连梁的性能及设计方法[J].重庆建筑大学学报,2008,30(2):37-42 Fu Jianping,Chen Jingzhou,Pi Tianxiang et al.Experimental study on small-span-to-depth-ratio coupling beams with new reinforcement scheme and design method[J].Journal of Chongqing Jianzhu University,2008,30(2):37-42
[4] Mihaylov B I,Franssen R.Shear-flexure interaction in the critical sections of short coupling beams[J].Engineering Structures,2017,152:370-380
[5] 田建勃,史庆轩,王南.基于软化拉-压杆模型的小跨高比钢板-混凝土组合连梁受剪承载力分析[J].工程力学,2016,33(5):142-149 Tian Jianbo,Shi Qingxuan,Wang Nan.Shear strength of plate-reinforced composite coupling beams with small span-to-depth ratio using softened strut-and-tie model[J].Engineering Mechanics,2016,33(5):142-149
[6] 赵军,邱计划,高丹盈.钢纤维部分增强混凝土剪力墙延性及耗能性能试验研究[J].应用基础与工程科学学报,2010,18(6):940-949 Zhao Jun,Qiu Jihua,Gao Danying.Experimental study of steel fiber partially reinforced concrete shear wall[J].Journal of Basic Science and Engineering,2010,18(6):940-949
[7] 张宏战,张瑞瑾,黄承逵.小跨高比钢纤维高强混凝土连梁延性和耗能研究[J].大连理工大学学报,2009,49(6):884-890 Zhang Hongzhan,Zhang Ruijin,Huang Chengkui.Ductility and energy dissipation capacity of steel fiber reinforced high-strength concrete coupling beams of small span/depth[J].Journal of Dalian University of Technology,2009,49(6):884-890
[8] Kuang J S,Baczkowski B J.Shear capacity of steel fibre reinforced concrete coupling beams[C].Joint International Conference on Computing and Decision Making in Civil and Building Engineering.2006:3837-3846
[9] Bruggi M.Generating strut-and-tie patterns for reinforced concrete structures using topology optimization[J].Computers & Structures,2009,87(23):1483-1495
[10] 魏巍巍,贡金鑫.按我国规范的压杆-拉杆设计方法[J].建筑结构,2008,29(增1):287-293 Wei Weiwei,Gong Jinxin.Strut-and-tie design method based on Chinese code[J].Journal of Building Structure,2008,29(S1):287-293
[11] 张文学,李建中,龙佩恒.拉-压杆模型合理性量化评价指标研究[J].工程力学,2009,26(5):52-57 Zhang Wenxue,Li Jianzhong,Long Peiheng.Quantification index research for the rationality of strut-and-tie model[J].Engineering Mechanics,2009,26(5):52-57
[12] Baczkowski B J.Steel fibre reinforced concrete coupling beams[D].Hongkong:The Hongkong University of Science and Technology,2007
[13] 赵军,李斌,李光辉.不同跨高比钢纤维混凝土连梁的延性和耗能性能[J].世界地震工程,2012,28(4):17-22 Zhao Jun,Li Bin,Li Guanghui.Ductility and energy dissipation of steel fiber reinforced concrete coupling beams with different span-depth ratios[J].World Earthquake Engineering,2012,28(4):17-22
[14] Zhao Z Z,Kwan A K H,He X G.Nonlinear finite element analysis of deep reinforced concrete coupling beams[J].Engineering Structures,2004,26(1):13-25
[15] 赵顺波,李凤兰,赵国藩,等.钢筋钢纤维混凝土梁的斜截面承载力[J].应用基础与工程科学学报,1998,6(1):81-86 Zhao Shunbo,Li Fenglan,Zhao Guofan et al.Shear resistance of steel fiber reinforced concrete beams[J].Journal of Basic Science and Engineering,1998,6(1):81-86
[16] Schlaich J,Sch?fer K,Jennewein M.Toward a consistent design of structural concrete[J].PCI Journal,1987,32(3):74-150
[17] Paulay T,Binney J.Diagonally reinforced coupling beams of shear walls[J].ACI Special Publication,1974,42(2):579-598
[18] Hwang S J,Lu W Y,Lee H J.Shear strength prediction for deep beams[J].ACI Structure Journal,2000,97(3):367-376
[19] Thomas T C H,Mo Y L.Unified theory of concrete structures[M].Chichester:Wiley Press,2010:78-80
[20] 邢国华,刘伯权,吴涛.基于软化拉-压杆模型的钢筋混凝土框架节点受剪分析[J].建筑结构,2011,32(5):125-134 Xing Guohua,Liu Boquan,Wu Tao.Shear strength of reinforced concrete frame joints using softened strut and tie model[J].Journal of Building Structures,2011,32(5):125-134
[21] 高丹盈,史科,赵顺波.基于软化拉压杆模型的钢筋钢纤维混凝土梁柱节点受剪承载力计算方法[J].土木工程学报,2014,47(9):101-109 Gao Danying,Shi Ke,Zhao Shunbo.Calculation method for shear capacity of steel fiber reinforced concrete beam-column joints based on softened strut-and-tie model[J].China Civil Engineering Journal,2014,47(9):101-109
[22] 刘清山,梁兴文.抗震剪力墙小跨高比连梁受剪承载力的软化拉压杆模型解[J].建筑科学,2009,24(7):5-9 Liu Qingshan,Liang Xingwen.The softening strut-and-tie model method for calculation of shear bearing capacity of deep coupling beams[J].Building Science,2009,24(7):5-9
[23] Ng T,Htut T,Foster S J.Fracture of steel fibre reinforced concrete-the unified variable engagement model[D].Sydney:The University of New South Wales,2012
[24] 张宏战.钢纤维高强混凝土构件受剪性能试验研究[D].大连:大连理工大学,2005 Zhang Hongzhan.Experimental study on shear resistance properties of steel fiber reinforced high-strength concrete members[D].Dalian:Dalian University of Technology,2005
[25] 龚炳年,方鄂华.反复荷载下联肢剪力墙结构连系梁的性能[J].建筑结构学报,1988,9(1):34-41 Gong Bingnian,Fang Ehua.Behavior of reinforced concrete coupling Beams between Shear walls under cyclic loading[J].Journal of Building Structures,1988,9(1):34-41
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