V型偏心支撑钢框架滞回能需求层间分布影响因素

Influencing factors of the hysteresis energy demand interlayer distribution of V-type eccentrically braced steel frames

采用不同地震波对10层3跨、15层3跨、20层3跨等3种V型偏心支撑钢框架结构进行了地震能量分析,研究了地震动特性和结构特性对滞回能层间分布及各构件耗能的影响。结果表明,地震动加速度峰值对滞回能层间分布及各构件耗能的影响较大,地震动频谱特性、持时及结构特性对滞回能层间分布的影响较小;滞回能在总输入能中的百分比受结构阻尼比的影响较大,但阻尼比不改变地震下结构总耗能的大小。

Using different seismic waves, this paper analyzes the seismic energy of V-type eccentrically braced steel frames with ten-storied three-span, fifteen-storied three-span and twenty-storied three-span, and studies the influences of ground motion characteristics and structural properties on the interlayer hysteresis energy de- mand distribution and energy dissipated of each member. Studies show that the peak ground motion acceleration has significant influence on the interlayer hysteresis energy demand distribution and energy dissipation of each member. Ground motion spectral characteristics, duration and structural characteristic give less affection of the interlayer hysteresis energy demand distribution. The structural damping ratio has significant influence on the hysteresis percentage of the total input energy, but the damping ratio does not change the total dissipated energy of the structures under earthquakes.