带仓顶室简承式筒仓的自振周期及地震作用计算

通过对筒承式筒仓的计算分析,带仓顶室筒承式筒仓的整体自振基本周期比筒仓主体的自振基本周期及仓顶室固定在地面的自振基本周期的大值要略大。采用基底剪力法计算筒仓水平地震作用时,计算仓顶室水平地震作用可采用筒仓的整体自振基本周期,其水平地震作用效应的增大系数一般取4.0,取振型指数大于1.0时,增大系数可取3.0;计算支承筒的水平地震作用应采用筒仓主体的自振基本周期。

Calculation of Natural Vibration Period and Seismic Action of Cylindrical Silos Supported by Cylinders and Attached with Building on Top of Silos

Through analysis, it is found the natural vibration period of the cylindrical silos supported by cylinders and attached with building on top of silos is slightly longer than the fundamental natural vibration period of the main room and that of the building on top of silos when it be directly constructed on the ground. The seismic response analysis is carried out to calculate the horizontal seismic action of cylindrical silos. In analyzing the horizontal seismic action of the building, the natural vibration period of the complete silo structure is adopted. The enhancement coefficient of seismic effect is taken as 4.0. When the modal index is bigger than 1.0, the enhancement coefficient may be taken as 3.0. In analyzing the horizontal seismic action of supporting cylinders the natural vibration period of the main room is adopted.