摘要
以实例工程为背景,在模型验证的基础上,采用数值分析的方法,研究了钢筋混凝土框架顶部进行钢结构加层时,底部既有钢筋混凝土框架层数、加层钢框架层数以及加层柱截面尺寸变化等对结构抗震性能的影响。分析表明,可以根据建筑最大层间位移角限值,确定最大加层层数和最小加层柱截面尺寸。加层结构层间位移角最大值常出现在加层结构顶部第2层,而原结构下部某一层位也可能在加层后演化成整体结构薄弱层。加层越多,底层层间剪力值反而越小;实际工程中可以在结构顶部设计较柔的顶层(人工耗能层),以减少底部地震剪力,实现被动抗震目的。
Based on a practical project,the anti-seismic parameters of structures with steel frame additional constructed on the prototype reinforced concrete frame are investigated by means of numerical analysis.After models verification,several key factors are discussed,such as story of the prototype reinforced concrete frame,story of the additional constructed steel frame,and size of the column section of the additional constructed steel frame and so on.It reveals that the maximum additional number of stories and minimum section size may be determined by the inter-story maximum horizontal displacement angle.With the additional steal frame adding on the top of the original structure,the maximum horizontal displacement angle often comes into being at the second floor from the top of the structure,at the same time,a certain story in the prototype structure may evolve into a weak story which has to be reinforced.However,with the increasing of additional stories,the total shear force in the bottom story decreases,which leads to a new passive anti-seismic design concept.
出处
《工程抗震与加固改造》
北大核心
2014年第2期66-71,共6页
Earthquake Resistant Engineering and Retrofitting
关键词
数值分析
底部剪力
加层
层间位移角
numerical analysis
shear force in bottom story
additional story
inter-story displacement angle
