钢结构的地震反应修正系数

The Seismic Response Modification Factors of Steel Structures

现代结构抗震设计利用结构的延性和超强,并引入地震反应修正系数对设防地震下的单质点弹性反应谱进行折减,得出结构的设计地震作用后按弹性设计结构。结构地震反应修正系数的取值是否合理关系到结构抗震设计的安全与经济,采用Pushover推覆、改进的能力谱法计算了按我国规范设计的12个抗弯钢框架、15个V型偏心支撑钢框架的地震反应修正系数、延性折减系数、超强系数,并与国内现行抗震规范隐含的地震反应修正系数进行了对比。

The ductility and overstrength of the structure are used in the modern structure seismic design,and the seismic response modification factor is used to reduce the linear elastic response spectra of single-of-freedom,which helps to obtain the design seismic forces in the modern seismic design.The seismic response modification factor is important to the reliability and economy of the building seismic design.Based on the static pushover analysis with the modified capacity spectrum method,the paper has analyzed the seismic response modification factor,ductility reduction factor,and overstrength factor of 12 moment resisting steel frames and 15 V-eccentrically braced steel frames according to the national standard design,which is also compared with the seismic response modification factor implied in the present seismic norms in China.