NUMERICAL SIMULATION OF IMPEDANCE FUNCTIONS AND THEIR EFFECT ON THE DYNAMIC BEHAVIOUR OF TOWERS
Almost any type of structural system may be subjected to one form or another of dynamic loading during its lifetime. In particular, transmission towers are subjected to important dynamic loads such as wind. To account for wind load, a rigorous study tacking into account soil structure interaction can be performed. A key step of this study consists of estimating the dynamic response of the foundations by calculating their complex impedance functions (i.e. dynamic stiffness K and damping C) or the displacement functions (inverse of impedance functions).``The purpose of this work is to evaluate the displacement functions of strip footings on the surface of some homogeneous soil in which the shear velocity increases as a function of the effective overburden stress. Three typical cases are considered. For each case, the adopted mechanical characteristics correspond to a type of soil.``In order to study their effect, the obtained impedances are applied to a simplified model of transmission tower under harmonic and transient wind loading. Finally, a real transmission tower modeled with the finite element software ADINA is studied. Two situations are considered (i) the tower supports are rigid or (ii) the foundation flexibility is modeled with impedances. Results indicate that support reactions can be affected by tacking into account soil-structure interaction.
Impedance function dynamic soil-structure interaction shear wave velocity transmission towers oscillating frequency FLAC ADINA.
Abir Jendoubi Frédéric Legeron Mourad Karray
PhD student, Faculté de génie, Université de Sherbrooke, Québec, Canada, J1K 2R1 Prof., Faculté de génie, Université de Sherbrooke, Québec, Canada, J1K 2R1
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）