The Soft Soil Effect On Seismic Response Of High-Rise Buildings In The Pearl River Delta Coastal Area

The number of actual cases in recent decades show that site conditions have significant effect on the damage of long period structures,especially the long period of building soft site has significant abnormal damage.In the coastal areas of China,a large number of high-rise buildings have been built on the site of soft soil,and the safety of these high-rise buildings in the future earthquake is worth studying deeply.Based on this assumption,a typical deep soft soil in Pearl River Delta region and with weak interlayer reclamation site as the research object,from the type of site and build on the two aspects of high-rise structure seismic characteristics analysis,in order to get a more comprehensive understanding of this kind of special site.The paper can be summarized as the following aspects:(1)Analysis of seismic response characteristics of soft soil sites along the Pearl River delta.In this paper,two typical deep soft soils in the Pearl River Delta region and the soft interlayer reclamation site are selected to calculate the ground motion of the ground in the same time by using one dimensional equivalent linearization method.The results show that with the increase of input ground motion peak,peak acceleration and peak ground surface input ratio decreases,under major earthquake ratio is less than 1;while the characteristic period of response spectrum is significantly increased,showed that the effect of such soft soil site is very significant,may threaten the safety of seismic structure with long period.(2)Analysis of seismic response characteristics of soft soil sites along the Pearl River delta.In this paper,two typical deep soft soils in the Pearl River Delta region and the soft interlayer reclamation site are selected to calculate the ground motion of the ground in the same time by using one dimensional equivalent linearization method.The results show that with the increase of input ground motion peak,peak acceleration and peak ground surface input ratio decreases,under major earthquake ratio is less than 1;while the characteristic period of response spectrum is significantly increased,showed that the effect of such soft soil site is very significant,may threaten the safety of seismic structure with long period.(3)Seismic response analysis of high rise buildings in coastal soft soil site.The choice of a high-rise building in Shenzhen city as the research object to establish the SAP2000 model of finite element analysis in detail,and were used to design ground motion and seismic code of the first two chapters should be the ground motion as the dynamic response of the structure input.The results show that the earthquake and earthquake peak acceleration under the basic design,the coastal soft soil site and in the seismic code is not very different,but the structure of the interlayer displacement angle is more than two times larger than the latter;under rare earthquake,the peak acceleration of design of soft soil site is far less than the seismic code,but the former still structure interlayer displacement angle the latter is more than nearly doubled,indicating that the long-period seismic effect of the type of site is very significant,the design and construction of high-rise buildings in the seismic measures should be adopted to improve the seismic grade.