| The problem of soil-structure interaction (SSI) is always an important research topic paid a great deal of attention to in the field of earthquake engineering over a long period of time. For many structures built on deep soft deposits, strong interaction appears between soils and superstructure. The purpose of this paper is to discuss the influence of SSI effect to pile-box foundation frame and shear wall high-rise building built on deep soil sites, high-rise building with two towers and adjacent double high-rise building. So, in this paper superstructure, pile-box foundation and deep soft soils are considered as a whole system to analyze its earthquake response.First, a 26-storied frame and shear wall high-rise building with pile-box foundation on deep soft deposits is analyzed under input different ground motions. The results show:1. Deep soft sites can amplify the input ground motion, this amplification is related to the characteristic of the soil deposits and the input ground motion. After detailed analysis, the relationships between the amplification coefficient and the maximum acceleration peak value of input ground motion is given.2. Through the comparison of earthquake response of high-rise building built on rigid base and deep soft sites, the influence of SSI effect to frame and shear wall high-rise building with pile-box foundation is analyzed; the earthquake response characteristic of superstructure built on different deep soft sites is discussed for different input ground motions. Some rules of SSI effect to the absolute acceleration peak value and relative displacement of high-rise building floors are drawn out.3. The interaction system is analyzed by two-dimension and three-dimension finite element method, the results are compared with each other.Second, the earthquake response of piles-multistoried basement-high-rise building with two towers is analyzed by numerical simulation, some rules of SSI effect to high-rise building with two towers are drawn out; compared with that of high-rise building with single tower, the difference of the two systems are indicated. Still, this paper discusses the influence of connections between the two towers, the results show that the connections have great effect on the earthquake response of high-rise building with two towers. If the connections are set at the bottom or bottom-top, they can greatly reduce the earthquake response of high-rise building with two towers for input acceleration peak value level equivalent to the most probable earthquake and design basic earthquake. So, the connections set at the bottom or bottom-top of two towers are good manners to reduce the earthquake response of high-rise building with two towers. Still, the connections set at the bottom-top can remarkably reduce the earthquake response of the top floors of high-rise building with two towers.Last, the earthquake response of adjacent double high-rise building built on deep soft sitesis analyzed and the effect of SSI are discussed; In accordance with two different systems of adjacent double and single high-rise buildings, the difference of their earthquake response on deep soft sites is analyzed. The results show that, in general, the absolute acceleration peak value of high-rise building is a little smaller than that of single tower high-rise building, however, the acceleration peak value of the floors in the middle of high-rise building with double tower may be lager than that of single high-rise building. In addition, some valuable conclusions have been obtained by analyzing the influence of the distance between two double high-rise buildings to their earthquake response.
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