考虑楼板效应的钢结构地震反应对比分析

以10层钢结构为研究对象,在罕遇地震作用下,通过ANSYS有限元数值方法,对纯框架结构及偏心耗能支撑结构在考虑楼板作用与不考虑楼板作用情况下结构的地震响应进行了比较分析,结果表明:在考虑楼板作用下纯框架结构顶层位移X、Y方向分别减小了31.3%和33.9%;结构顶层加速度X、Y方向分别增大了39.7%和45.2%.由于楼板的约束效应,结构的整体刚度增加,自振周期减小.考虑比不考虑楼板作用同样的耗能结构耗能能力减小了,在分析耗能结构时不能忽略楼板作用.分析结果为钢结构抗震设计提供了参考.

Comparative Analysis of Earthquake Responses of Steel Frames under the Effect of Floor Slabs

A 10-layer steel structure is studied as the object under a rare earthquake action,the earthquake responses of a pure frame structure and an eccentrically energy dissipating brace structure are analyzed using ANSYS finite element numerical method.The result shows that the top floor displacements in X and Y directions of the pure frame structure,when considering slab action were reduced by 31.3% and 33.9% respectively in contrast with those without considering slab action.The top floor accelerations in X and Y directions of pure frame structure when considering slab action were increased by 39.7% and 45.2% respectively in contrast with those without considering slab action.Because of the constraint effect of floor effect,the natural cycle was decreased.The energy dissipated of the same energy-dissipating structure when considering slab action was reduced than that without considering slab action.The slab action should not be neglected when we analyze the energy-dissipating structure.The results have a definite value for reference in the seismic design of steel structures.