钢结构加层层数对结构抗震性能的影响

由于自重轻、抗震性能好等优点，钢结构直接在混凝土结构上加层正越来越多的应用到实际工程中．由于原结构和加层结构采用不同的结构形式，加层后形成的混合结构存在质量和刚度的突变，而加层层数的多少直接影响整体结构的受力．结合工程实例，采用有限元分析程序从层剪力、层间位移等方面比较分析加层层数对加层结构抗震性能的影响．

Effect of the Number of Adding Steel Stories on Anti-Seismic Performance

Adding steel stories on the top of the original structure is widely used in practice because of its lightness and superior anti-seismic properties. The mixed building after adding stories is formed by different types of structures, so significant differences occur in the mass and stiffness. The number of adding stories has great influence on the anti-seismic behavior of the structures. In the paper, a finite element analysis software package is employed to a practical project to analyse the influence of the number of adding steel stories on the antiseismic behavior of the structures from the story shear force and story drift of the structures.