The Damping Effect Analysis Of Double-layer Cylinder Grid Shell

Due to absorbing excessive earthquake energy, some members in traditional structures may enter into elastic-plastic state, even yield or fail under strong earthquake, with a consequence of repair failure later or direct collapse. Dampers added to structures are responsible for consuming energy introduced by earthquake or other dynamic inputs. The supplemental energy dissipation systems can be used to control story drift, improve or upgrade the structural seismic performance of new or existing building. This technique has been becoming one of the main tendency of earthquake-resistant engineering research. Scholars and engineers of this domain in many countries are being engaged in this field of research and practice.A direct numerical integration of the equations of motion is a general method for analyzing damper-added structures. The motion equations of damper-added structures and the dynamic time-history analysis procedure are discussed in detail. The procedure can solve a SDOF system, a MDOF system, a system considering torsional responses, or a three-dimensional finite element system. When the structure keeps elastic except for the local nonlinearities, the fast nonlinear analysis (FNA) method is desirable for an elastic response history analysis. And the fast nonlinear analysis (FNA) method in the program SAP2000 that has been expatiated in the thesis.Firstly, in this introduces the research status of the reticulated shell structure, in this passage, study on the shock absorption principle of different dampers and calculation model.. Based on the static and dynamic research, proposed replacement some chord by dampers. After this research, make the model analysis and find out its free vibration and natural frequency,then study on the double-layer cylinder grid shell with different location,amount, damping exponent, damping coefficient. When we take Vanishing energy & damping shake technology ,we should considered the economy. In this paper,we proved that take some dampers replacement chord can obtained good effect, moreover it will provides lots experience and datas to the after research...