| Fully taking the advantages of both steel and reinforced concrete structure and possessing good characteristics,such as low cost,good economic performance,quick speed of construction,etc, steel-concrete hybrid structure has become one of the main high-rise structures in our country, especially super high-rise buildings. Frame-hybrid tube structure with steel-concrete composite coupling beam is one kind of new structure. Researching dynamical characteristics of frame-hybrid tube structure with steel-concrete composite coupling beam,which will make us understand the inherent attribute of structure itself, will be the basis for design of such structures and the formulation of relevant regulations, and also will be the foundation on further promoting such structures. The main research contents include the following four areas as followings:1. Based on the summary research results in the past (the composite joint,hybrid coupled shell wall), this paper proposes the frame-hybrid tube structure experimental plan of 1/5 scale model, then by testing of ambient vibration, acceleration pulse time history of the measuring points is received.2. With analysis of professional software DASP, natural vibration frequency (period),vibration mode and damping ratio of model structure with the counter-weights or not are obtained,according to the principle of dynamic similarity, dynamical characteristics of model structure with the counter-weights can deduce dynamical characteristics of archetypal structure,which provides a field test information for a new structure.3. Based on the model experiment, according to the fundamental theory of the structure's dynamic analysis and using finite element software ANSYS, A three-dimensional finite element analysis model is established under the different live load reduction factors, the modal analysis of finite element model is conducted, the dynamical characteristics of archetypal structure are obtained, furthermore, by comparing the results of the test results and numerical simulation calculation, advised datum of the live load reduction factor is determined in calculating the seismic action of the gravity load value, the causes of error are analyzed and the correctness of this model and the computational method are confirmed.4. Based on the finite element model in this paper and using finite element software ANSYS, four different factors about live load reduction factor,coupling beam,concrete strength grade,stiffness of tube are discussed, which are aimed at summarize variation of structural dynamical characteristic. |
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