Dynamic Response Analysis Of The Application Of Herringbone Multi-ribbed Reticulated Shell

The herringbone multi ribbed latticed shell belongs to one of the concrete folded plate latticed shells.The appearance is similar to the traditional form of sloping roof.However,the drawing beam below the folded plate is used to cancel the thrust of the folded plate to the supporting member.The formation of a large space,it effectively improves the utilization of space.The structure itself has a natural drainage slope.Good durability and fire resistance.Conforms to the idea of green building.Nowadays,China's economy is developing steadily.The economic losses caused by earthquake disasters increase with the development of China's economy.China is also in the world between the Pacific Rim seismic belt and Eurasian seismic belt.Earthquake activity is frequent,Earthquake prevention and disaster reduction work cannot meet the actual needs of today.Therefore,it is imminent to study the seismic performance of building structures.The dynamic response of a herringbone multi ribbed latticed shell structure is discussed in this paper.The dynamic performance of the human shaped ribbed reticulated shell is described from the time domain analysis method of the modal parameters of the human shaped ribbed reticulated shell and the dynamic response of the structure under the horizontal earthquake.The seismic response of the structure under horizontal seismic action is analyzed by mode decomposition response spectrum method and elastic time history analysis method respectively.The results of the two algorithms are compared.In the time domain calculation method of modal parameters of herringbone multi ribbed latticed shell,Theoretical examples and model tests are used to verify the ITD algorithm in the time domain calculation of modal parameters.The results show that the ITD algorithm has high theoretical accuracy.And it is easy to operate.The demand for the number of measuring points is less,The parameters of the dynamic response under random excitation or environment excitation can be identified by the first processing methods(such as random decrement,NExT method,etc.).Through the model test,it is found that the ITD method is more sensitive to noise.It may have a certain effect on the results of the calculation.Therefore,the algorithm still has some improved space.The results of the modal decomposition response spectrum method of the herringbone multi ribbed latticed shell show that the stiffness and structural span to span ratio of the top columns are the main factors that affect the seismic responses of the horizontal direction of the structure.For the ratio of sagittal span,After meeting the requirements of the relevant specifications and carrying capacity,The value of the vector span ratio is not more than 0.35.For the stiffness of the frame column,Increasing the stiffness of frame columns can significantly improve the seismic performance of the horizontal structure.Meanwhile,attention should be paid to the stiffness ratio of the lateral stiffness of the top floor to the lateral stiffness of the other floors.Avoid occurrence of shear mutation.The stiffness of the ribs,the stiffness of the side beams and the stiffness of the diaphragm have little effect on the seismic performance of the horizontal structure.The thickness of the roof slab has some adverse effects on the seismic performance of the structure.Therefore,it is suggested that after meeting the requirements of relevant codes and carrying capacity,Try to reduce the thickness of the roof panel.In the time history analysis of the herringbone multi ribbed latticed shell,The results of the time history analysis method are compared with the modal decomposition response spectrum method.The dynamic response of modal decomposition response spectrum method is larger than that of time history analysis.Therefore,the modal decomposition response spectrum method is a safety algorithm in practical engineering applications.The results of the mode decomposition response spectrum method and the time history analysis method can be obtained.The results obtained by the time history analysis method are quite discrete.The degree of dispersion coincides with the response spectrum of the selected seismic waves and the design response spectrum specified by the code.Especially,the spectral value near the critical period of the structure is consistent with the design response spectrum.