计算模型对简支箱梁和T梁剪力滞结果影响
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摘要
以剪力滞效应为研究对象,分别采用MIDAS和ANSYS两种软件配合不同的荷载形式、单元类型和网格密度对一个简支箱梁模型和一个实际简支T梁结构进行计算对比,分析了模型参数和荷载类型对所得结果的影响,为剪力滞效应的有限元分析提供了参数。研究表明:对于同一计算工况,ANSYS比MIDAS所得应力幅值略大,实体单元比板单元所得应力幅值略大,高密度网格比低密度网格所得应力幅值略大,但偏差大都在±5%以内;当腹板与顶板无承托时,对于任意荷载作用,两种软件的1倍网格板单元即可准确得到顶板的剪力滞效应;当腹板与顶板有承托时,在点荷载和线荷载作用下,可采用板单元进行顶板的剪力滞效应分析,但对面和体荷载,则需要采用实体单元进行分析,并且均可采用1倍网格密度。
Taking shear lag effect as the research object,a simple-supported box girder model and a practical simplesupported T-beam structure were calculated and compared by using MIDAS and ANSYS software respectively,combined with different load forms,element types and grid density. The influence of model parameters and load types on the obtained results was analyzed,which provided parameters for the finite element analysis of shear lag effect. The research indicates that: under the same calculation condition,the stress amplitude of ANSYS is slightly larger than that of MIDAS,the stress amplitude of solid element is slightly larger than that of plate element,and the stress amplitude of high density grid is slightly larger than that of low density grid,but the deviation is mostly within ±5%. For the situation that there is no haunch at web and top flange,under arbitrary loads,the shear lag effect of roof can be accurately obtained by 1 time grid plate element of two kinds of software. If there is haunch at web and top flange,the shear lag effect of top flange can be analyzed by plate element under point load and line load. However,for both surface and body load,the solid element analysis is needed,and 1 time grid density is applicable for the both conditions.
Taking shear lag effect as the research object,a simple-supported box girder model and a practical simplesupported T-beam structure were calculated and compared by using MIDAS and ANSYS software respectively,combined with different load forms,element types and grid density. The influence of model parameters and load types on the obtained results was analyzed,which provided parameters for the finite element analysis of shear lag effect. The research indicates that: under the same calculation condition,the stress amplitude of ANSYS is slightly larger than that of MIDAS,the stress amplitude of solid element is slightly larger than that of plate element,and the stress amplitude of high density grid is slightly larger than that of low density grid,but the deviation is mostly within ±5%. For the situation that there is no haunch at web and top flange,under arbitrary loads,the shear lag effect of roof can be accurately obtained by 1 time grid plate element of two kinds of software. If there is haunch at web and top flange,the shear lag effect of top flange can be analyzed by plate element under point load and line load. However,for both surface and body load,the solid element analysis is needed,and 1 time grid density is applicable for the both conditions.
引文
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[10]郭建生.有限元法中单元类型和密度对计算结果的影响[J].湖北工业大学学报,2007,22(4):24-28.GUO Jiansheng. The influence of the digital results caused by element type and mesh density in finite element method[J].Journal of Hubei University of Technology,2007,22(4):24-28.
[11]张永超,佟丽莉,曹婧,等.悬臂梁不同单元类型计算误差分析[J].河北工程大学学报(自然科学版),2016,33(4):5-9.ZHANG Yongchao,TONG Lili,CAO Jing,et al. Calculation error analysis of cantilever beam of different element types[J]. Journal of Hebei University of Engineering(Natural Science),2016,33(4):5-9.
[12]刘旭政,程坤,陈晔,等.大跨度变截面波形钢腹板组合连续箱梁桥剪力滞效应研究[J].沈阳建筑大学报(自然科学版),2017,33(5):855-862.LIU Xuzheng,CHENG Kun,CHEN Ye,et al. Shear lag effect of long span composite continuous box-girder bridge with corrugated steel webs and variable cross-section[J]. Journal of Shenyang Jianzhu University(Natural Science),2017,33(5):855-862.
[13]罗旗帜.薄壁箱形梁剪力滞计算的梁段有限元法[J].湖南大学学报,1991,18(2):33-38.LUO Qizhi. Calculation of the shear lag in thin walled box girders by the finite segment method[J]. Journal of Hunan University,1991,18(2):33-38.
[14]肖军,李小珍,刘德军,等,不同位移函数对箱梁剪力滞效应的影响[J].中国公路学报,2016,29(9):90-96.XIAO Jun,LI Xiaozhen,LIU Dejun,et al. Influence of different displacement functions on shear lag effect of box girders[J]. China Journal of Highway and Transport,2016,29(9):90-96.
[15]蔺鹏臻.混凝土箱梁剪力滞效应的分析理论与应用研究[D].兰州:兰州交通大学,2011.LIN Pengzhen. Analysis Theory and Application of Shear Lag Effect for Concrete Box Girders[D]. Lanzhou:Lanzhou Jiaotong University,2011.
[2]郑宇.刚构-连续组合单箱室桥剪力滞效应分析[J].北方交通,2014(2):46-50.ZHENG Yu. Rigid framework-analysis on the shearing force lag effects of continuously combined single case bridge[J]. Northern Communications,2014(2):46-50.
[3]程再峰,刘林山,刘世忠.简支箱梁中剪力滞产生的应力集中现象[J].世界桥梁,2005(4):38-40.CHENG Zaifeng,LIU Linshan,LIU Shizhong. Stress concentration phenomenon caused by shear lag in simply supported box girder[J]. World Bridges,2005(4):38-40.
[4]张杨永.连续刚构箱梁桥剪力滞效应的参数分析[J].公路工程,2008,33(4):58-66.ZHANG Yangyong. Parameters analysis of shear lag effect for continuous rigid-frame box girder bridge with single cell[J].Highway Engineering,2008,33(4):58-66.
[5]罗伟,丁汉山.双T简支梁桥剪力滞效应分析[J].工业建筑,2008,38(增刊1):245-249.LUO Wei,DING Hanshan. Shear lag effect analysis on double t section of simply-supported beam bridges[J]. Industrial Construction,2008,38(Sup1):245-249.
[6]石欣.箱梁计算机辅助设计关键技术研究[D].吉林:吉林大学,2011.SHI Xin. Study on Key Technologies for Computer Aided Design of Box Girder[D]. Jilin:Jilin University,2011.
[7]骆佐龙,宋一凡,贺拴海,等.薄壁箱梁剪力滞效应分析的组合单元法[J].公路交通科技,2014,31(9):58-75.LUO Zuolong,SONG Yifan,HE Shuanhai,et al. Combined element method for shear lag effect analysis of thin-walled box girder[J]. Journal of Highway and Transportation Research and Development,2014,31(9):58-75.
[8]蔡恒,卢海林,汤正.基于板壳有限元理论的薄壁箱梁剪力滞效应[J].铁道科学与工程学报,2017,14(4):779-786.CAI Heng,LU Hailin,TANG Zheng. Shear lag effect of thin-walled box girder based on shell finite element theory[J]. Journal of Railway Science and Engineering,2017,14(4):779-786.
[9]周永军.不同单元类型在曲线混凝土连续梁桥受力分析中适用性研究[J].四川建材,2017,43(3):84-86.ZHOU Yongjun. Research on the applicability of different element types in the stress analysis of curved concrete continuous beam bridge[J]. Sichuan Building Materials,2017,43(3):84-86.
[10]郭建生.有限元法中单元类型和密度对计算结果的影响[J].湖北工业大学学报,2007,22(4):24-28.GUO Jiansheng. The influence of the digital results caused by element type and mesh density in finite element method[J].Journal of Hubei University of Technology,2007,22(4):24-28.
[11]张永超,佟丽莉,曹婧,等.悬臂梁不同单元类型计算误差分析[J].河北工程大学学报(自然科学版),2016,33(4):5-9.ZHANG Yongchao,TONG Lili,CAO Jing,et al. Calculation error analysis of cantilever beam of different element types[J]. Journal of Hebei University of Engineering(Natural Science),2016,33(4):5-9.
[12]刘旭政,程坤,陈晔,等.大跨度变截面波形钢腹板组合连续箱梁桥剪力滞效应研究[J].沈阳建筑大学报(自然科学版),2017,33(5):855-862.LIU Xuzheng,CHENG Kun,CHEN Ye,et al. Shear lag effect of long span composite continuous box-girder bridge with corrugated steel webs and variable cross-section[J]. Journal of Shenyang Jianzhu University(Natural Science),2017,33(5):855-862.
[13]罗旗帜.薄壁箱形梁剪力滞计算的梁段有限元法[J].湖南大学学报,1991,18(2):33-38.LUO Qizhi. Calculation of the shear lag in thin walled box girders by the finite segment method[J]. Journal of Hunan University,1991,18(2):33-38.
[14]肖军,李小珍,刘德军,等,不同位移函数对箱梁剪力滞效应的影响[J].中国公路学报,2016,29(9):90-96.XIAO Jun,LI Xiaozhen,LIU Dejun,et al. Influence of different displacement functions on shear lag effect of box girders[J]. China Journal of Highway and Transport,2016,29(9):90-96.
[15]蔺鹏臻.混凝土箱梁剪力滞效应的分析理论与应用研究[D].兰州:兰州交通大学,2011.LIN Pengzhen. Analysis Theory and Application of Shear Lag Effect for Concrete Box Girders[D]. Lanzhou:Lanzhou Jiaotong University,2011.