Application And Research Of Non-rigid Connecting Types On Multi-tower Connected Structure

Multi-tower connected structure belongs to a kind of complex high-rise building structure, having the complex shape and vibration form. Connecting body is the key component, and the key problem of multi-tower connected structure design is the connecting type of connecting body and two-side major buildings.In this paper, for the single-layer connected structure of connecting body with weak stiffness and long span, modal analysis method and time-history method are applied to study the different connecting types of connecting body and major structure, including rigid connection in both ends, hinge connection in one end and slide in another, elastic connection in both ends and investigate the dynamic behavior, seismic response and the distribution of the internal force from connecting body of four-tower connected structure and double-tower connected structure with chasis by using structural analysis software ETABS. When the both-end connections are elastic and the connecting body is arranged in different heights of tower building, the dynamic behavior, seismic response and internal force of connecting body of structure are calculated, compared and analyzed. Simultaneously, the elastic connection of connecting body and major structure has been practically applied to the engineering design and construction of a certain multi-tower connected structure engineering, getting a good result. Significant conclusions are summarized and some suggestions are put forward for this kind of engineering design, and the simulation of elastic connecting type is used in the calculation and analysis, which are the reference for engineering designers and researchers.And the main conclusions are as follows:1. When the stiffness of connecting body with long span is weak relatively, the three connection types:rigid connection in both ends, hinge connection in one end and slide in another, elastic connection in both ends, have almost the same dynamic behavior. The both-end rigid connection type of connecting body and major structure can slightly reduce the displacement of structure along the direction of connecting body and has little influence on the displacement along the vertical direction of connecting body, inter-story shear force and moment.2. When the stiffness of connecting body with long span is weak relatively and both ends of connecting body and major structure are rigid connections, the internal force of middle chord member is relatively large; when one end is hinge connection in and another is slide, the internal force of chord member in the hinge end is larger than that in other places; when both ends of connecting body and major structure are elastic connections, the internal force of connecting body is small relatively.3. When the mass and stiffness of connected structure are much less than two-side major buildings, the non-rigid connection(hinge connection in one end and slide in another or slide elastic connections in both ends) is the appropriate choice for connecting body and major structure, to reduce the negative influence of vibration of major buildings.4. When the mass and stiffness of connected structure are much less than two-side major buildings and the span is long, the slide elastic connection from non-rigid connections is the appropriate choice. And when the both-end connections are elastic, the internal force of chord member under the earthquake decreases obviously, compared with rigid and non-rigid(hinge connection in one end and slide in another) connection, which is in favor of structural safety and the decrease of material consumption of connected structure.