Seismic Analysis of Asymmetric Structures Including Soil-structure Interaction Effects

• Main Authors: Han Rao Wang, 王瀚饒
• Other Authors: Y. H. Lei
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/50185281353424365611

碩士 === 淡江大學 === 土木工程學系 === 87 === The asymmetric structure, when subjected to a strong ground motion, would usually exhibit significant torsional effects due to its characteristics of the noncoincidence of mass and stiffness centers. Since both the magnitude and direction of the eccentricity for the asymmetric structure would depend on not only the internal layout of shear walls but also the external geometric shape, an intensive investigation is therefore performed detailedly in this research with respect to the seismic behaviors of various types of the multistory buildings including either irregular shear walls or unsymmetric plane shapes. The characteristics of torsional responses under different input angles of seismic force for all asymmetric structures concerned will then be expected to be fully understood accordingly. Furthermore, since the properties for the soil adjacent to the structure would affect the location of stiffness center significantly, the effective soil-structure interaction model is adopted in this investigation so as to obtain more realistic seismic responses. It is shown in the results that the most significant torsional effects would usually be found in the casese where the structural eccentricity line is perpendicular to the direction of seismic force. Besides, the softer the soil layers are, the smaller would be the shear stresses and relative torsional deformations of columns.