竖向质量分布对框架结构动力特性影响的研究
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摘要
在框架结构动力分析中,往往是把填充墙质量集中在楼层处进行求解。文中考虑填充墙实际分布对结构自振特性的影响,通过传递矩阵法求解结构自振频率和振型,并进一步分析了高阶频率的分布规律。结果表明,与采用集中质量模型的振型叠加法相比,填充墙的竖向质量分布会对框架结构高阶频率产生很大影响;框架结构的高阶模态具有局部性和密集分组的特性;同时,竖向质量分布不均匀所产生的失谐足以影响结构振型的整体性。
The masses of infilled walls are always concentrated at floors in the dynamic analysis of infilled-frame structure.In this paper,we take into account the real mass distribution along the height of structures,the natural frequencies and modes are found by using the method of field transfer matrix.This paper also analyzes the distribution rule of high-order frequencies.It shows that,compared with the modal analysis,which used the lumped-mass distribution model,the mass distribution along the height of structures may influence the high-order modes.There is a dense high-order mode section and the high-order modes have the local characteristics in the frame structures.At the same time,the disorder caused by infilled walls can also intluence the integration of high-order modes.
The masses of infilled walls are always concentrated at floors in the dynamic analysis of infilled-frame structure.In this paper,we take into account the real mass distribution along the height of structures,the natural frequencies and modes are found by using the method of field transfer matrix.This paper also analyzes the distribution rule of high-order frequencies.It shows that,compared with the modal analysis,which used the lumped-mass distribution model,the mass distribution along the height of structures may influence the high-order modes.There is a dense high-order mode section and the high-order modes have the local characteristics in the frame structures.At the same time,the disorder caused by infilled walls can also intluence the integration of high-order modes.
引文
[1]关国雄,夏敬谦.钢筋混凝土框架砖填充墙结构抗震性能的研究[J].地震工程与工程振动,1996,16(1):87-99.
[2]曹万林,王光远,吴建有,等.轻质填充墙异型柱框架结构层刚度及其衰减过程的研究[J].建筑结构学报,19951,6(5):20-31.
[3]GovIndan P,Lakshmipaty M,Santhakumar A R.Ductility of Infilled Frames[J].Journal of Structure,ACI,1986,83(5):567-576.
[4]刘大海,钟锡根,杨翠如.砖填充墙框架房屋的地震内力分析[J].建筑结构学报,19812,(34):34-43.
[5]童岳生,钱国芳,梁兴文,等.砖填充墙钢筋混凝土框架的刚度及其应用[J].西安建筑科技大学学报:自然科学版,1985,17(4):21-35.
[6]刘玉姝,李国强.带填充墙钢框架结构抗侧力性能试验及理论研究[J].建筑结构学报20052,6(3):78-84.
[7]Chaker A A,Cherifati A.Influence of masonry infill panels on the vibration and stiffness characteristics of R/C frame buildings[J].EarthquakeEngineering and Structural Dynamics 1,999,28(9):1061-1065.
[8]董刚,朱镜清.结构地震反应分析的频域传递矩阵法[J].计算力学学报,19941,1(4):429-435.
[9]朱镜清.结构振动计算中传递矩阵法的应用问题[J].地震工程与工程振动,19844,(1):36-44.
[10]GB50011-2001高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社2,002.
[11]易伟建,吴高烈,徐丽.基于结构高阶局部模态的损伤诊断研究[J].动力学与控制学报,2006,4(4):363-369.
[12]易伟建,周云.基于结构高阶局部模态的弹性地基上框架结构物理参数识别研究[J].地震工程与工程振动2,007,27(1):117-124.
[13]李凤明,汪越胜,黄文虎,等.失谐周期结构中振动局部化问题的研究进展[J].力学进展,20053,5(4):498-512.
[14]Hodges C H.Confinement of vibration by structural irregularity[J].J Sound Vib 1982,82(3):411-424.
[2]曹万林,王光远,吴建有,等.轻质填充墙异型柱框架结构层刚度及其衰减过程的研究[J].建筑结构学报,19951,6(5):20-31.
[3]GovIndan P,Lakshmipaty M,Santhakumar A R.Ductility of Infilled Frames[J].Journal of Structure,ACI,1986,83(5):567-576.
[4]刘大海,钟锡根,杨翠如.砖填充墙框架房屋的地震内力分析[J].建筑结构学报,19812,(34):34-43.
[5]童岳生,钱国芳,梁兴文,等.砖填充墙钢筋混凝土框架的刚度及其应用[J].西安建筑科技大学学报:自然科学版,1985,17(4):21-35.
[6]刘玉姝,李国强.带填充墙钢框架结构抗侧力性能试验及理论研究[J].建筑结构学报20052,6(3):78-84.
[7]Chaker A A,Cherifati A.Influence of masonry infill panels on the vibration and stiffness characteristics of R/C frame buildings[J].EarthquakeEngineering and Structural Dynamics 1,999,28(9):1061-1065.
[8]董刚,朱镜清.结构地震反应分析的频域传递矩阵法[J].计算力学学报,19941,1(4):429-435.
[9]朱镜清.结构振动计算中传递矩阵法的应用问题[J].地震工程与工程振动,19844,(1):36-44.
[10]GB50011-2001高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社2,002.
[11]易伟建,吴高烈,徐丽.基于结构高阶局部模态的损伤诊断研究[J].动力学与控制学报,2006,4(4):363-369.
[12]易伟建,周云.基于结构高阶局部模态的弹性地基上框架结构物理参数识别研究[J].地震工程与工程振动2,007,27(1):117-124.
[13]李凤明,汪越胜,黄文虎,等.失谐周期结构中振动局部化问题的研究进展[J].力学进展,20053,5(4):498-512.
[14]Hodges C H.Confinement of vibration by structural irregularity[J].J Sound Vib 1982,82(3):411-424.
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