结构高度对高耸结构振型贡献率的影响研究  

RESEARCH ON THE INFLUENCE OF STRUCTURAL HEIGHT ON THE MODAL CONTRIBUTION RATE OF HIGH-RISE STRUCTURE

作　　者：方蓉[1] 张文学[1] 赵汗青[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《工业建筑》2017年第6期70-74,85,共6页Industrial Construction

摘　　要：结构的高阶振型对超高墩桥梁和烟囱类高耸结构的地震响应有较大影响,目前对高耸结构地震响应特性的认识还不够深入。为此,根据高耸结构简化计算模型,推导了高耸结构单阶振型贡献率和累积振型贡献率理论计算公式,并通过有限元模型进行了对比验证,研究了结构高度对结构振型贡献率的影响规律。研究结果表明:结构高度对底部剪力振型贡献率的影响最大,对底部弯矩振型贡献率的影响次之,对结构顶部位移的振型规律性影响最小。结构底部剪力和底部弯矩的第1阶振型贡献率随结构高度的增加先呈现出明显降低,后趋于稳定的变化趋势;而第2阶振型的单阶振型规律性呈现出先随墩高增加而增加,后有所降低的趋势。结构底部剪力和底部弯矩的前n阶振型累计贡献率随结构高度的增加而降低。Higher mode of structure has a great influence on the seismic response characteristics of super high pier bridge and chimney high-rise structure. However,the understanding of the dynamic response characteristics of high-rise structure is not enough at present. Therefore,according to the simplified calculation model of the high-rise structure,the theoretical calculation formula of the single mode contribution rate and cumulative contribution rate of high-rise structure were derived,and comparison and validation were carried out by the finite element model. Then the influence of structural height on mode contribution rate of structure was studied. The study result showed that the influence of height on modal contribution rate to the bottom shear was the biggest,the influence on modal contribution rate to the bottom bending moment took second place and there was little influence on top displacement. With the increase of structural height,the first mode contribution rate of structural bottom shear and bottom bending moment showed an obvious decreasing firstly,and then tended to be stable. With the increase of structural height,the single mode contribution rate of the second mode increased firstly and then tended to decrease. The cumulative contribution rate of the first n mode of the structural bottom shear and bottom bending moment decreased with the increase of structural height.

关 键 词：高耸结构 超高墩 烟囱 振型贡献率 

分 类 号：TU973[建筑科学—结构工程] U441.3[建筑科学—桥梁与隧道工程]