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The giant - sub controlled structural system pulsation wind vibration response analysis

Author: BiJinFeng
Tutor: ZhangZuoAn
School: Northwestern Polytechnical University
Course: Engineering Mechanics
Keywords: Mega - sub controlled structural system Pulsating Wind Vibration Complex modal theory Additional column stiffness Damping ratio
CLC: TU352.1
Type: Master's thesis
Year: 2006
Downloads: 60
Quote: 1
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Abstract


Accelerated process of urbanization prompted a high-rise building rapid development in response to the shortage of land, rapid population growth and land prices and other urban development issues. Building height increases the need for a new structure to meet the requirements of building functions and vibration control in the form of mega - sub controlled structural system of the traditional mega-frame structure system the FM control principle TMD quality combined meet building functional requirements the same time, having a good control effect. In this paper, on the basis of previous studies, the large-span a giant beam structure layer mega - sub controlled structural system of sub-structure with the upper part of the giant beam structural layer is provided between the additional columns to form a new giant - sub controlled structural system. The dynamic equations of the structural system under random wind loads, complex modal theory based on the random vibration displacement response spectrum and acceleration response spectrum and response mean square value of the expression is derived. NEC Corporation building the main structure, the structure of the building in the form of Kobe, Japan, TC reference build three giant layer and four giant layer numerical examples. Important factor to affect the structural system response under random wind loads the stiffness ratio R_k and damping ratio R_c, change, additional column stiffness and additional damping damping. Discussed damper additional column stiffness of the structural system; structural system is selected in response to the larger particle, install dampers, dampers and additional columns at the same time the role of the structural system impact; analysis of the process of considering the two by the force of the structural system: the main and sub-structure wind loads and the main structure separate wind loads. The results show that: the huge set of additional columns - sub controlled structural system has good control, considering the main sub-structure wind loads better control; additional column settings reduce the peak response of the sub-structure, Stiffness Ratio R_k taken is preferably about 0.3: Additional damping of the damper so that the main structure and the sub-structure of the response were significantly reduced, the damping ratio Rc of the ideal value of 2 to 4. On the basis of numerical analysis, the application of simulation theory, given the initial program design giant - sub controlled structural system model. Giant set of additional columns - sub controlled structural system also has good control effect, while addressing the large span of the the giant beam structure layer, easier engineering.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure
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