The Seismic Response Analysis Of Spatial Arch Truss Under Different Site Conditons

In recent years, with the improvement of people’s living standards and the progress of the industrial production, culture, sports, more and more spatial structures have been used in our society. Various types of large stadium, convention centers, exhibition halls, aircraft hangars, warehouses and steel arch bridges are widely applied in our own life. These buildings have quite imposing and beautiful shape, which make our city has a bright scenery. With the increasing great use of this structural system, the seismic performance becomes more and more important.The foreign and domestic research aiming at large number of earthquake damages show that the buildings in different venues have different kinds of earthquake damages. It also seriously affect the cost and safety of the structure. In order to explore this difference, a model which the arch truss’s span is150m and the rise to span ratio is0.25was built in this paper. The model was designed by3D3S progrem of8degrees seismic protection level in the different venues. And lastly it was analised by SAP2000structure analysis program. The dynamic response, plastic development degree and damaged pattern of the structure were analyzed under the action of seismic wave. Therefore, some useful conclusions were found by comparing the analysis of calculation results:(1) In the flexible design stage, a spatial arch truss was designed in different site conditions by limiting the stress ratio. Next, the modal and response spectrum analysis of the spatial arch truss were practiced in the study. Most of the indicators are almost the same in the different site conditions after being compared with steel production, stress ratio, natural vibration period, mode of vibration and the displacement on the load combinations.(2) In this paper a suitable seismic wave database which was applicabled for different sites has been established according to seismic amplitude frequency, spectrum characteristics, duration and ground motion. But it dissatisfied the code requirement when the structure meet the rare occurrence earthquake.(3) In the elastic-plastic stage, it is clear that there were different responses in different site conditions and it embodied the great difference of the plastic development degree, damaged pattern, the plastic hinge number and location when the structure located on the failure boundaries. In this paper the influence degree was described in the different sites by quantitative analysis.