装配式斜支撑节点钢框架消能减震设计

Energy-dissipation Design of Prefabricated Steel Frame Structure with Inclined Support Joints

新型工业化装配式斜支撑节点钢框架由桁架梁、立柱、斜撑等构件组成,斜撑改变了结构的传力途径,使得结构刚度提高,但延性降低。为提高地震作用下结构延性,采用粘滞阻尼器对结构进行消能减震设计,运用SAP2000软件对非减震结构和减震结构进行罕遇地震下的非线性时程分析,对比分析不同阻尼器布置方案的减震效果,对结构整体抗震性能进行评价。分析结果表明:在罕遇地震作用下,粘滞阻尼器表现出良好的耗能性能,减震结构拥有更大的弹塑性变形和强度储备。在结构中从底层开始连续布置1/2楼层阻尼器即可达到所有楼层均布置阻尼器时的减震效果。

New industrial prefabricated steel frame structure with inclined support joints is consisted of steel truss beam, steel column and inclined braces, the inclined braces have changed the way of force transmission and improved the stiffness of the structure, but the ductility of the structure has decreased. The viscous damper is adopted to the energy-dissipation design in order to improve the ductility of the structure under seismic, and the nonlinear time-history analysis under the rare earthquake is carried out by SAP2000 software for the non-energy-dissipated structure and the energy-dissipated structure, and the dissipation effect of the structure with different damper layout is compared to evaluate the seismic performance of the overall structure. The results show that the viscous dampers have good dissipation capacity under rare earthquake, the story drift and maximum acceleration of the structure obviously decrease, the energy- dissipated structure has a greater capability to undertake elasto-plastic deformation and strength under rare-earthquake. The damper layout beginning from the bottom to the middle floor continuously can achieve the same effect of all floor layout dampers.