The Seismic Response Analysis Considering Waveing Passage Effect For The Steel Roof Of Qingdao Cruising Ferry Passenger Transportation Center

Compared to traditional civil architecture form, long-span spatial structure owns the advantages of lightweight, fast construction, large space and long span, and various structural forms and etc, it is widely applied in all kinds of public and industrial buildings. With the number of buildings of long span structure increasing, its safety is subjected to special concern, and we also have a higher requirement on the seismic resistance of the structure.Long-span spatial structure often has complex vibration mode, approximate natural vibration frequencies and tight coupling between vibration modes, etc. In seismic response analysis, given the structure has long span, uniform excitation has been difficult to meet the needs of seismic analysis, so the spatial effect of ground motion should be considered, and using the multidimensional and multiple excitation. This dissertation developed with the engineering background of steel roof in Qingdao cruising ferry passenger transportation center, through analyzing the seismic response indexes of typical bars and nodes in the roof structure, studied seismic resistance of long-span roof structure.Adopting general finite element analysis software sap2000, this dissertation modeled the long-span upper roof structure in Qingdao cruising ferry passenger, mainly to complete the following work:Firstly, the multipoint excitation time history method was used to analyze the typical component of roof structure under horizontal earthquake action, at the same time, to verify the accuracy of multipoint excitation time history analysis method, it also adopted the method of mode-superposition response spectrum, the uniform excitation, and compared with multipoint excitation time history analysis. It come to the conclusion that internal load response value of the component, in the multipoint excitation, was greater than its value of the component with the method of consistent excitation and mode-superposition response spectrum, indicated the multipoint excitation time history analysis method for seismic response analysis was more realistic and reasonable.Second, the law of internal load response of typical components in roof structure was analyzed in different apparent wave velocity, found that the internal load amplitude response of component was basically consistent under different apparent wave velocity, only had different moment to come an amplitude, proved that the smaller the apparent wave velocity is, the more significant wave hysteresis effect will be, and also the greater influence will be on structure.Next, it analyzed internal load response of components in roof structure with the method of the multipoint excitation time history analysis, under vertical seismic load, and then comparatively analyzed with the method of consistent excitation time history analysis and mode-superposition response spectrum, found out that internal load response value of components in roof structure with the method of the multipoint excitation time history analysis, less than it with the method of consistent excitation time history analysis and mode-superposition response spectrum.Finally, by choosing typical control node in horizontal direction, and analyzed the change of relative displacement response between the control node, and then evaluate under multipoint excitation, horizontal and vertical seismic action on the impact of the torsional deformation of the whole structure.