大跨维修机库结构采用耗能支撑的减震研究

Study on shock absorption of long-span maintenance hangar by setting energy disspation brace

大跨维修机库动力特性复杂,针对该类结构的减震研究则刚刚起步。本文结合大跨机库的地震响应特点,提出支撑柱顶与屋盖节点之间设置黏滞流体阻尼支撑的减震方案,对一大跨机库结构采用该减震方法进行了时程分析,对比减震前后结构基底剪力、柱顶侧移以及屋盖的杆件内力、位移。结果表明,该方法可以有效地吸收地震动输入能量,降低整体结构地震响应。由于机库结构特点决定了支撑柱间阻尼器的不均匀布置,导致减震效果在屋盖范围内的不均匀分布,分析结果表明屋盖杆件内力减震效果与杆件地震内力分布规律相吻合,表明该类减震方案对于大跨度维修机库屋盖地震响应具有非常好的针对性。

The dynamic characteristics of long-span hangar are very complex and shock absorption study on this type of structure is just of started. Combining with seismic response characteristics, the shock absorption method bysetting fluid viscous dampers between columns and joints of the roof is proposed. Time-history analysis of one hangar with fluid viscous dampers is carried out. Comparison results of base shear, lateral displacement of column cap,inner force of space-frame poles and displacements of joints in the roof show that this measure can effectively absorb the earthquake energy. Because of the uneven arrangement of dampers determined by the structure characteristics,damping effect of the bars belonging in the roof is also uneven. The damping effect distribution of the internal force of spatial-frame poles is well tallied with that of internal force under earthquake. Results show that the method studied in this paper is very appropriate for the seismic response passive control of the roof structure of long-span hangar.