多高层建筑顶部塔楼的水平地震作用研究
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摘要
研究了多、高层建筑顶部塔楼的水平地震作用,当采用底部剪力法简化计算时,对塔楼地震作用增大系数βn作了理论和计算分析,指出了βn的控制因素为主体结构基本周期T1、塔楼与主体的周期比Tn/T1和重力荷载比Gn/G,并对现行高层混凝土规范中的βn作了改进。分析中采用基于有限元理论的振型分解反应谱法建模计算,共计算了258种工况,根据这些结果给出了简化法中的修正系数βn值及实用表格,可供工程设计使用。
Horizontal earthquake effects on the protruding small towers on the top of tall buildings are investigated. Increscent coefficient is analyzed to adjust the horizontal earthquake effects on the tower by base-shear method. It is pointed out that the controlling factors of increscent coefficient include basic period of the main structure, period ratio and gravitational load ratio between the tower and the main structure. The increscent coefficient from Technical Specification for Concrete Structures of Tall Building is improved. Mode superposition method based on finite element model is used to compute seismic effects under 258 conditions. Based on the results, an increscent coefficient table is supplied for practical design.
Horizontal earthquake effects on the protruding small towers on the top of tall buildings are investigated. Increscent coefficient is analyzed to adjust the horizontal earthquake effects on the tower by base-shear method. It is pointed out that the controlling factors of increscent coefficient include basic period of the main structure, period ratio and gravitational load ratio between the tower and the main structure. The increscent coefficient from Technical Specification for Concrete Structures of Tall Building is improved. Mode superposition method based on finite element model is used to compute seismic effects under 258 conditions. Based on the results, an increscent coefficient table is supplied for practical design.
引文
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[2]赵西安,王万里.带塔楼高层建筑在地震时的动力反应[J].建筑结构学报,1987,8(4):67~77.Zhao Xi’an,Wang Wanli.Dynamic response of tall building with tower under earthquake[J].Journal of Building Structures,1987,8(4):67~77.(in Chinese)
[3]Kimura Eiichi,Konno Tomonori.Earthquake effects on steel tower for microwave antennas atop building[J].Review of the Electrical Communication Laboratories,1975,23(3–4):301~315.
[4]梁兴文.带屋面突出物的高层建筑水平地震力的实用算法[J].建筑结构,1997,7:31~33.Liang Xingwen.Practical algorithm of the horizontal seismic forces of the tall building with tower[J].Building Structure,1997,7:31~33.(in Chinese)
[5]邵弘,赵西安.高层建筑突出屋面小塔楼的地震力[J].建筑结构,1987,1:2~7.Shao Hong,Zhao Xi’an.The earthquake force of the protruding small tower in tall building[J].Building Structure,1987,1:2~7.(in Chinese)
[6]JGJ3-2002.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,2002.JGJ3-2002.Technical specification for concrete structures of tall building[S].Beijing:China Building and Architecture Press,2002.(in Chinese)
[7]沈聚敏,周锡元.抗震工程学[M].北京:中国建筑工业出版社,2000.Shen Jumin,Zhou Xiyuan.Aseismic engineering[M].Beijing:China Building and Architecture Press,2000.(in Chinese)
[8]Ray Clough,Joseph Penzien.Dynamics of Structures(2nd Edition)[M].USA:Computers and Structures Inc.,1995.
[9]杨桂通,张善元.弹性动力学[M].北京:中国铁道出版社,1988.Yang Guitong,Zhang Shanyuan.Elastic dynamics[M].Beijing:China Railway Press,1988.(in Chinese)
[10]博弈创作室.ANSYS7.0工程结构分析技术与实例详解[M].北京:中国水利水电出版社,2003.Boyi Workroom.ANSYS7.0Project structural analysis technique and example[M].Beijing:China Water and Electricity Press,2003.(in Chinese)
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