不同荷载作用下直线箱梁剪力滞效应分析
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摘要
利用有限元分析软件分析了在集中荷载、均布荷载和地震作用下简支直线箱梁的剪力滞效应.保持简支直线箱梁的长度、弹性模量、泊松比、密度等参数不变,仅通过改变作用其上的荷载类型,探讨了不同荷载作用下直线箱梁的剪力滞效应;重点分析了简支直线箱梁的跨中横截面顶板上不同荷载作用下的应力分布及剪力滞系数变化规律.结果表明在3种不同荷载的作用下,简支直线箱梁跨中截面顶板的剪力滞系数均在顶板与腹板交接处最大;集中荷载和均布荷载大小的改变对直线箱梁剪力滞效应的影响可以忽略不计;地震作用下直线箱梁的剪力滞效应较为明显.
We analyzed the shear lag effect of simply-supported straight box girder under the concentrated load,the uniform live load and the earthquake action using the finite element analysis software.Keeping the same parameters of simply-supported straight box girder such as length,elastic modulus,Poisson ratio,density and so on,only changing the types of loads,we analyzed the distribution of section stress and the variation of shear lag coefficient in the roof of the mid-span of simply-supported straight box girder under different loads.The results show that shear lag coefficient of roof and web junction of simply-supported straight box girder in the roof of the mid-span is maximum under the three different loads; the effect of changing the concentrated load and the uniform live load on the shear lag of straight box girder can be neglected; the shear lag effect of straight box girder under the earthquake action is more obvious.
We analyzed the shear lag effect of simply-supported straight box girder under the concentrated load,the uniform live load and the earthquake action using the finite element analysis software.Keeping the same parameters of simply-supported straight box girder such as length,elastic modulus,Poisson ratio,density and so on,only changing the types of loads,we analyzed the distribution of section stress and the variation of shear lag coefficient in the roof of the mid-span of simply-supported straight box girder under different loads.The results show that shear lag coefficient of roof and web junction of simply-supported straight box girder in the roof of the mid-span is maximum under the three different loads; the effect of changing the concentrated load and the uniform live load on the shear lag of straight box girder can be neglected; the shear lag effect of straight box girder under the earthquake action is more obvious.
引文
[1]廖宇.大悬臂弧线底板城市高架箱梁桥剪力滞效应研究[D].长沙:中南大学,2010.LIAO Yu.Analysis of shear lag in arc bottom urban elevated box girder bridge with large cantilever[D].Changsha:Central South University,2010.(in Chinese)
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[6]邹毅松,李成君,易祥军.薄壁箱梁剪力滞效应计算方法研究[J].桥梁与隧道工程,2012(5):93-98.ZOU Yi-song,LI Cheng-jun,YI Xiang-jun.Calculation of shear lag effect of thin-walled box girder[J].Bridge&Tunnel Engineering,2012(5):93-98.(in Chinese)
[7]蔡汶珊.薄壁曲线箱梁剪力滞数值计算与实验研究[D].长沙:长沙理工大学,2010.CAI Wen-shan.Numerical calculate and experimental research about shear lag effect of curved thin wall box girders[D].Changsha:Changsha University of Science&Technology,2010.(in Chinese)
[8]卢海林.预应力混凝土曲线箱型梁剪力滞效应理论分析与试验研究[D].天津:天津大学,2005.LU Hai-lin.Theoretical analysis and experimental study on shear-lag effect of prestressed concrete curved box beam[D].Tianjin:Tianjin University,2005.(in Chinese)
[9]程军,扶名福,林治平.有机玻璃的力学与光塑性性能[J].天津大学学报,2000,1(33):85-87.CHENG Jun,FU Ming-fu,LIN Zhi-ping.Mechanical and photo plasticity research of polymethyl methacrylate[J].Journal of Tianjin University,2000,1(33):85-87.(in Chinese)
[10]彭聪,张鹏梁,孙凯.基于ANSYS的桥梁地震响应有限元分析[J].山西建筑,2007,5(15):53-54.PENG Cong,ZHANG Peng-liang,SUN Kai.FEA of bridge's earthquake respondence on ANSYS[J].Shanxi Architecture,2007,5(15):53-54.(in Chinese)
[2]FOUTCH D A,CHANG P C.A shear lag anomaly[J].Structural Engineering(ASCE),1982,108(7):1653-1658.
[3]SUNG C L,CHAI H Y,DONG Y.Analysis of shear lag anomaly in box girders[J].Structural Engineering(ASCE),2002,128(11):1379-1386.
[4]SHUSHKEWICH K W.Negative shear lag explained[J].Structural Engineering(ASCE),1991,117(11):3543-3546.
[5]陈利鹏.地震荷载作用下曲线箱梁剪力滞效应研究[D].武汉:武汉工程大学,2014.CHEN Li-peng.Analysis of shear lag in curved box girder under seismic loads[D].Wuhan:Wuhan Institute of Technology,2014.(in Chinese)
[6]邹毅松,李成君,易祥军.薄壁箱梁剪力滞效应计算方法研究[J].桥梁与隧道工程,2012(5):93-98.ZOU Yi-song,LI Cheng-jun,YI Xiang-jun.Calculation of shear lag effect of thin-walled box girder[J].Bridge&Tunnel Engineering,2012(5):93-98.(in Chinese)
[7]蔡汶珊.薄壁曲线箱梁剪力滞数值计算与实验研究[D].长沙:长沙理工大学,2010.CAI Wen-shan.Numerical calculate and experimental research about shear lag effect of curved thin wall box girders[D].Changsha:Changsha University of Science&Technology,2010.(in Chinese)
[8]卢海林.预应力混凝土曲线箱型梁剪力滞效应理论分析与试验研究[D].天津:天津大学,2005.LU Hai-lin.Theoretical analysis and experimental study on shear-lag effect of prestressed concrete curved box beam[D].Tianjin:Tianjin University,2005.(in Chinese)
[9]程军,扶名福,林治平.有机玻璃的力学与光塑性性能[J].天津大学学报,2000,1(33):85-87.CHENG Jun,FU Ming-fu,LIN Zhi-ping.Mechanical and photo plasticity research of polymethyl methacrylate[J].Journal of Tianjin University,2000,1(33):85-87.(in Chinese)
[10]彭聪,张鹏梁,孙凯.基于ANSYS的桥梁地震响应有限元分析[J].山西建筑,2007,5(15):53-54.PENG Cong,ZHANG Peng-liang,SUN Kai.FEA of bridge's earthquake respondence on ANSYS[J].Shanxi Architecture,2007,5(15):53-54.(in Chinese)
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