Structure Dynamic Characteristics Analysis Under Earthquake On Single-layer Reticulatecd Shell With60mSpan

In recent years, economic development and production capacity has improved people’s requirements of the building structure. Spatial Structure, especially in long-span spatial Structure of high-performance is chasing, such as large stadium、 conference center、 exhibition hal、 hangar、 workshop、 warehouse and steel arch bridge are showing in front of people. These architectures are not only require high performance,shape is also very unique.Long-span space latticed structure forms have been widely used by many great projects, so terrible casualties will be caused once these structures collapses under severe earthquakes. As a result,the collapse pattern and mechanism of the space latticed structure forms is a hot focus in study field.On the structure of the dynamic elastic-plastic time history analysis,it is the key point to choice the proper ground motion records for predicting the basis of seismic response of building structures. It analysis the whole process of simulation of structural dynamic collapse under earthquake conditions.Considering such this reason,it researches the single layer latticed shell of the60m span and0.2span ratio, the use of large-scale finite element analysis software to model the seismic fortification level with8degrees of small earthquakes the structure of the initial design and to study the dynamic response of its structure under the seismic waves, deformed shape, and the failure modes. Comparativing analysis on the calculation results,we gain some useful conclusions.The main research contents:(1)This article provides the threat of human survival posed by earthquake and the great significance of seismic, analysis the dynamic response of the theory of structure at home and abroad.(2)Application the structural analysis software of SAP2000, this paper designs response spectrum on the single layer latticed shell of the60m span and0.2span ratio,analysis its modal, state of stress and displacement.(3) We choose three earthquake waves, each wave input along the structure’s X, Z and X+0.85Y+0.65Z direction,to dynamic structure elastic-plastic time history analysis.(4) Use tow kind of methods, one is change the constraint conditions and another is reselect the frame, to optimization structure.and choice dangerous X+0.85Y+0.65Z direction to input LWD wave to run the time history analysis.The main conclusions as follows:(1)The characteristics of space structure vibration mode is concentration greatly. And the structure this article used is symmetry about the origin. There is an obvious space structure mode of vibration characteristics.(2)Before change happened, frame destroying always occurs in the stem that connection with rods.With wave’s function, along with the increase of wave peak acceleration, when reaching to a single peak, the structural displacement is gentle increase in nonlinear condition, but have no big mutations show that structure failure is in intensity.(3) When structure is under the action of the same seismic waves the appearance of peak acceleration of plastic hinges has much to do with the destruction critical peak acceleration, which shows that structure still enjoys a larger energy dissipation capacity in the elastic stage.(4)With improve the shell of two methods, the damage a moment ago appear the rod of the plastic hinge structure all samples was substantial ascension, and focus on span’s1/4. At the same time, compared to before the adjustment, structure’s energy consumption capacity and deformation capacity are improved obvious.