Staic,Aseismic,and Wind-Resistant Analysis Of The Double-Tower-Connected Structures

Double-Tower-Connected Structures (DTCS), a new structure system of tall buildings, has been applied widely in practical engineering, but researches about it are not systemic or in-depth. Studies on structural properties, static behaviors and dynamic characteristics, seismic and wind-induced responses of the DTCS are given systematically in this paper, which gives help to a deeper understanding of the basic conception for the DTCS. And the paper also establishes a foundation for further researches and provides a reasonable design guidelines. A new computation model for analyzing the DTCS system, which considering the main structure by a consolidated model and the connections by elasticity-body is presented. The proposed model has such superiority as less computational work, high precision and convenience in data treatment. The calculation deviations are also avoided in some cases when considering the infinite rigidity in floors plane or neglecting the connections. And the new model is applied to study the dynamic characteristics, seismic and wind-induced responses of the DTCS. Comparing with the single tower structures, DTCS is a system comprising with multiple components, and it抯 so important to grasp the interaction mechanism among the components. Comparing with the double-tower structures without connections, the connections are the keys to interconnect the components, and emphasis is put on the analysis of the connections in this paper. Effects of many factors, such as symmetry of two towers, connections stiffness and location etc., on the static and dynamic behaviors, seismic and wind-induced responses of the DTCS are investigated in detail. Furthermore, the effects on the structure behaviors due to the varieties of the joint stiffness and damping for two kinds of joint between the connections and the towers are studied. In the matter of static analysis, the finite element method is adopted to investigate the influence of the connection stiffness and locations on the behavior of the DTCS, and two kinds of joint method--pin-joint and rubber bearing, are studied. The idea, that the DTCS may be transformed into mega-door-shaped structures, is discussed. In the matter of dynamic analysis, the dynamic characteristics have been compared between the DTCS and the double-tower structures. The influence of connection stiffness on dynamic characteristics of the DTCS is analyzed, also. In the matter of wind-induced response analysis, the method of random vibration for the DTCS is discussed, and the wind-induced dynamic coefficients of the structure system are calculated and analyzed. Effects of connection stiffness and damping on the wind-induced dynamic coefficients, the structure acceleration and displacement responses are studied. As a supplement of FEM, the model of continuous beam is proposed and applied for analyzing the dynamic properties for the DTCS system when the base of the structure is excited harmonically in longitudinal and transversal direction respectively. II The analytical or numerical methods are used to analyze the influence of the connected stiffness, damping, relative stiffness of two towers on structural responses, and some useful conclusions are obtained. In order to make the conclusions more applicable, all the parameters are treated non-dimensionlizedly during the analysis.