Research On The Mode Analysis Response Spectrum Of The High-rise Construction With The Vertical Earthquake Action

At present, in the vertical earthquake effect of the high-rise structure using the strikeout decomposition response spectrum method is using less, the bottom axial force method of national regulation is relatively rough and confined to intensity 9 degrees area. Wenchuan Earthquake shows near-field seismic vertical earthquake acceleration and horizontal earthquake acceleration ratio is more than the regulation, high-rise structures of vertical seismic response was undervalued. Develop accurate and practical vertical seismic calculation method can guarantee the safety degree of high-rise building, and protect state and people's life and property security.This article uses SAP2000 software in common high-rise building structures of two different methods of overall analysis. In analysis drew this two calculation methods have building structure seismic response of different specification simplified methods, and points out the shortage.This researching outcomes shows that:(1) In the calculation of the high-rise building vertical seismic response is used when strikeout decomposition response spectrum method more accurate than the bottom axial force method.(2) Under the vertical seismic , the high-rise building structure appear vertical rupture of the column-column or column-wall of, also adopts strikeout decomposition response spectrum method and bottom axial force method.(3) The vertical earthquake in under the action of big span structure, when the independent cycle and posts roof self-vibration cycle is near, there will be second resonance phenomenon, this kind of phenomenon can lead to big cross beam bending moment and displacement of the increased sharply.