Parameter Sensitivity Analysis Of Energy Dissipation For Double Layer Cylindrical Latticed Shell

The damping effect concerning to the middle-span of the double cylindrical latticed shell, the main research object, with viscous damper was researched and a series of energy dissipation parameters was analyzed in this paper. Then the main parameters and the corresponding rules influencing the damping effect were concluded. The valid data is obtained in order that the further damping theoretical and the experimental research are developed in future. The main contents and achievements are shown as following.Firstly, the theory of energy dissipation technology and its application status in shell structure was introduced, and the viscous damper was selected as energy dissipation component. Meanwhile, the basic structure, influencing factors, computation model and damping principles of viscous damper were described; Performance-based seismic design principle of energy dissipation structure was sketched, and the concrete steps of seismic design was proposed. It is demonstrated that the time-history analysis method can be well used in the seismic control design of large-span space structures. Fast Nonlinear Analysis (FNA) method is belong to time-history analysis method and is applicable for local non-linear analysis for structure. Because of the local non- linear of the structure, FNA was finally chosen to conduct dynamic analysis; The geometrical model of double cylindrical latticed shell was established with the MST. By using the finite element software SAP, the time history analysis under the impact of three-direction earthquake wave was carried out. A energy dissipation scheme for the structure with viscous damper was put forward basing on the dynamic response characteristics. It is that putting dampers on the nodes of large relative displacement, replacing a part of transverse lower chords on the corresponding location, and arranging dampers with interval layout. Through conducted the damping effect analysis of structures, it is indicated that viscous dampers with reasonable arrangement can get good damping effect for double cylindrical latticed shell. Based on the decided damping scheme, the dynamic analysis of double cylindrical latticed shell was conducted on different energy dissipation parameters. The influence on damping effect in the wake of change of parameters can be reached. It is concluded that replacing pattern is superior to appending pattern; It is not the larger number of dampers the better effect in the structure. There is a reasonable amount; Damping effect is more sensitive to damping coefficient and damping exponent. Considering two aspects of security and economic, there is a reasonable value range of damping coefficient and damping exponent, a better damping effect for structure can be reached in this range; It has certain influence on damping effect of shell thickness, rise-span ratio, length and span. In the wake of changes of the parameters within the certain range, the damping effect is different at different positions of the structure, but there is little effect to the overall structure.Finally, according to the variation on damping effect of energy dissipation parameters, a new energy dissipation scheme with viscous damper is put forward. The scheme is suitable for the middle-span double cylindrical latticed shell. It has some reference meaning for practical engineering application.