Seismic Response Analysis And Research Of The Ship Unloader

The thesis researched the 3500t/h ship unloader’s seismic response under the seismic excitation.The thesis includes five aspects: the static earthquake analysis of the ship unloader,the typical seismic wave selection and artificial seismic wave simulation,the response spectrum analysis of the seismic,the time-history analysis of the ship unloader and the unloader’s anti-seismic device structure design and the parameter optimization of the device.The thesis assumes that the structure of the ship unloader has the same ground vibration under the static earthquake analysis of the ship unloader.Suffered an earthquake excitation,the structure applied a force that is the ground acceleration multiplied by the quality of the structure.The acceleration selected based on the size of the soil conditions and seismic intensity.Through the static analysis,we can overview the mechanical properties of the structure,including the weak position and anti-seismic performance of the structure,also it can be as the foundation of the seismic dynamics analysis.As seismic dynamic analysis needs the multiple sets of representative seismic excitation,the thesis,in addition to selected two typical seismic waves,but also simulated one artificial wave.Typical seismic waves were regulated mainly by filter,adjust the amplitude and baseline adjustment,to satisfy the site requirements.In addition,through the principle introduction of artificial seismic wave,with the help of the standard response spectrum curve of architectural structure,the thesis generated an artificial wave compatible with the response spectrum.Based on the region requirements and the design categories,the thesis got the seismic influence coefficient curve and executed a reasonable correction to the curve.With the help of ANSYS and the ship unloader’s modal characteristics,the paper studied the seismic response analysis by using the modal response spectrum method for the whole structure of the ship unloader system,under the elastic deformation stage.Finially,the thesis got seismic response spectrum results of the ship unloader.If we want forecast maximum possible seismic response results,we must be structure dynamic time-history analysis,observing the structure response process during the seismic excitation period.Encountering rare earthquake,most of the structure will be destroyed,so apart from the time-history analysis of linear elastic stage,the thesis also simulated material model based on the ship unloader that encounter rare earthquake excitation in elastoplastic stage;According to the time-history analysis results,the paper verify the the limitations of response spectrum analysis,described the structure response process under seismic excitation,including the stress,the displacement and the reaction forces.By the results of the front study: the ship unloader can withstand 7 degrees earthquake and the structure will destroy in the 8 degrees earthquake.The last part of the thesis studied the structure design and parameters optimization of the anti-seismic isolation device.To structural parameter optimization,the thesis firstly established ship unloader parametric finite model with seismic isolation device in the ANSYS program,specifying the design parameters such as state variables;at least,the results of the optimization parameters of the seismic isolation device isolation effect were checked in the thesis.