多高层建筑顶部附加地震作用系数研究

Research of top additional earthquake action coefficient in multi-storey reinforced concrete frame structure

较长周期的(T1>1.4Tg)多高层规则建筑结构,在三类场地土(Tg=0.55s)条件下,采用底部剪力法计算水平地震作用沿房屋高度方向的分布时,《建筑抗震设计规范》(GB50011—2008)与《高层建筑混凝土结构技术规程》(JGJ3—2002)中的顶部附加地震作用系数在取值上存在较大差异。采用振型分解法,对该种情况下的结构进行了分析,得出顶部附加地震作用系数的变化规律。研究成果对于该类结构抗震设计具有一定的参考价值。

For the longer periodic mulit-storey building,its period is always greater than 1.4 times of the site soil characteristic period.The distribution of horizontal earthquake action in high rise building was analyzed.When the equivalent base shear method was applied to solve the seismic action on this type of building under the conditions of the site soil classification is Ⅲ type,there is a significant difference in the value of the top additional earthquake action coefficient between Code for Seismic Design of Buildings(GB50011—2008) and Technical Specification for Concrete Structures of Building(JGJ3—2002.)The mode analysis method was adopted to analyze the longer periodic mulit-storey building and the regularity of top additional earthquake action coefficient was found out.The analysis result has particularly reference value for the seismic design for this type of building.