Study On Damping Of Long-span Cable-stayed Truss Type Roof Structural

In recent decades as the rapid development of long-span cable-stayed girder roof structure, Long-span cable-stayed girder structure in the industrial, gymnasium, workshop, station, the theatre, etc has been widely used in the building.Received attention at home and abroad.Due to their large span cable-stayed spatial structure features one large span, the second is low stiffness and the third is when the reaction is very sensitive to the role by the earthquake, and has beautiful architecture, such as the advantages of affordable.Therefore, the large cross-stayed truss roof structure is widely used, then make energy dissipation Span stayed truss roof structure for research becomes more important.In this paper, Span stayed truss roof structure of a convention center in the background, through the ANSYS software to build a large span cable-stayed span of a finite element model of 80 m truss roof structure, the modal analysis and structure and the results were compared modal analysis and understanding of the basic dynamic characteristics of the structure.In this paper, the principle of seismic wave selection chosen EL- Centro wave, Tianjin wave and a simulation of artificial waves.Then introduce the time-history analysis illustrate the calculation method, the EL- Centro seismic wave after appropriate adjustment, Tianjin wave and a simulation of artificial wave input Span stayed truss roof structure, and then stayed for a large cross-truss roof analysis of elastic-plastic analysis under the elastic structure and strong earthquakes were carried out when the small earthquakes.Then it is concluded that the control node displacement time history curve, and the time history analysis after the large-span cable-stayed girder internal force value of the roof structure. To shock absorption, this paper introduces several kinds of energy dissipation performance of the shock absorbing device, and by using the ANSYS finite element software to simulate the single round hole mild steel damper metal quasi static loading test, finally chose the single round hole mild steel damper metal.Finally analyzes the single round hole in the roof system of mild steel damper metal vibration, the before and after installation of the metal damper of large-span cable-stayed girder roof structure under the action of minor earthquakes elastic time history analysis and relativity of elastic-plastic time history analysis, and compares the results of the analysis, comparison of shock absorbing device installed in the shock absorption effect of each node to long-span cable-stayed girder roof structure in the face of displacement during an earthquake are above 30%, the decrease of the amplitude of the reduction of the acceleration amplitude were above 40% and that to join the single round hole after the mild steel damper metal, can effectively reduce the vibration of the structure.Structure after major earthquakes, structuremodels under elastic-plastic vibration characteristic of the vibration characteristics and structure of the elastic time history analysis results are consistent, it is concluded that long-span cable-stayed girder roof structure under the action of minor earthquakes and earthquake under the action of displacement under the condition of the vibration are obtained the very good control, vibration control has achieved good effect.