Dynamics And Structural Control Of Megaframe With Suspension Systems

A history review of the high-rise buildings finds that the development of the building material is the internal cause and propulsion of the development of the high-rise buildings. The building material is light in weight, high in strength and low in damping nowadays,which make it necessary to find a new form of structural system to be applied in. Meanwhile, with the increase of the height of the high-rise buildings, the wind resistant and earthquake resistant control become increasingly important A review of the structural control is presented. It is proposed that a corresponding structural system, which is fit for the structural control in high-rise buildings, should be found. The configuration of megaframe with suspension systems (MFSS) is proposed a kind of new philosophy in the structural control in high-rise buildings. The dynamic analysis and strategies in the structural control is introduced, ft is highly recommended that the structural control with the MFSS configuration is a initial philosophy in the structural control in high-rise buildings.An algorithm to find the lateral stiffness of the suspension systems is proposed, in which different effects such as gravity, interaction between the neighboring floors and the different ways of connection are taken into consideration. This algorithm is also applied to the calculation of lateral stiffness of the megaframe with the effect of the compressive force in the columns taken into consideratioa A lumped mass-spring dynamic model of the MFSS is introduced to find some of the dynamic properties of the combined system The analysis shows that the frequencies of the combined system are closely spaced in groups, and that the combined system has very good aseismic property.For a combined pimary-secondary structure with closely spaced frequencies, The component-mode synthesis method combined with Kronecker algebra is illustrated as an effective way in the non-stationary stochastic analysis. In using component-mode synthesis technique, it is easy to determine which modes to be truncated and thus the number of degrees of freedom in the dynamic analysis can be greatly reduced.A study of the transfer function of the primary structure and the power flow between the primary and secondary structures under evolutionary earthquake input is presented, which gives a physical insight into the interaction between the primary and secondary structures of the...