In this paper, firstly using the commonly used continuum technique for multi-towers with enlarged base in the lower floors, a new piecewise continuous vibrational model is established. Then, the vibrational differential equations for the model have been derived. Secondly, using the ODE (Ordinary Differential Equation) solver, which is a general-purpose program developed for solving various ODE problems including eigen value problem, the natural frequencies and vibrational modes have been obtained, and the dynamical behaviours for different parameters are discussed.
Keywords: tall building structure; multi-towers; enlarged base; horizontal vibration; dynamical behaviours