【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。更多还原

【Abstract】 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.更多还原