Analysis Of Seismic Performance Of Concrete Two-way Folded-plate Arch Reticulated Shell

The concrete folded plate arch shell is a new type of concrete space structure proposed by Zhang Huagang and others.It can be understood as a double structure.The main structure is composed of a transverse ridge(valley)and a longitudinal ridge.Rib are supported on the main structure,the longitudinal ridge arch is a multi-fold arch;it can also be understood as a folded arch structure formed by a grid of V-shaped folded plate arches arranged in the longitudinal direction.It has the advantages of beautiful shape,simple construction,good economic indicators and convenient design,and effectively solves the problem of complex construction of concrete curved shells.With the rapid development of the economy,large-span structures have begun to be widely used,but at the same time,the losses and impacts caused by earthquakes have increased exponentially.Therefore,the seismic performance of large-span public buildings has received more and more attention.The accuracy of response results is also increasing.This paper mainly discusses the seismic response of concrete folded arch shells.First,static and dynamic analysis of the structure is provided to provide a basis for the selection of the structure and to lay the foundation for the study of the seismic response of the structure.Parametric analysis of the seismic response of the structure using mode-decomposition response spectrum method to explore the influence of various influencing parameters on the seismic performance of the structure.Finally,the elastic time-history analysis method with consistent input and the elastic time-history analysis method with non-uniform seismic input considering traveling wave effect are used to calculate and compare the seismic response of the structure to study the effect of traveling wave effect on the structure.Parametric analysis of the static and dynamic behaviors of the concrete bidirectional folded plate arch reticulated shell shows that the low-order mode of the roof is mainly vertical vibration,the location of weak stiffness appears in the open,and the transverse ridge(valley)line arch The longitudinal ridge arch and the chord on the open web truss are the main force-transmitting components of the structure.The transverse sagittal ratio has a significant effect on the maximum deflection of the structure,while the change of the longitudinal sagittal ratio has a relatively small effect on the overall stiffness,deflection and internal force of the structure;the longitudinal ridge arch stiffness has almost no effect on the mechanical properties of the structure;The ridge(valley)line arch stiffness has a significant effect on the overall stiffness of the structure;an increase in the stiffness of the multi-ribbed beam can significantly enhance the overall stiffness of the structure,but because the mass of the structure has increased significantly,the stiffness of the multi-ribbed beam has little effect on the structure Fundamental frequency;the upper chord of an open web truss is used as the edge structure of the arch foot.Increasing its rigidity will hardly change the overall stiffness of the structure and will not have a significant impact on the internal force distribution of the structure.Parametric analysis of the seismic response of the concrete bidirectional folded plate arch reticulated shell using the mode decomposition response spectrum method shows that the chords and multi-ribbed beams of the open web truss are not greatly affected by the earthquake,while the longitudinal ridge arch and the transverse ridge The line arch is significantly affected by the earthquake;the increase of the stiffness of the component has a small effect on the internal force coefficient of the earthquake,but the vector span ratio has a greater effect on the internal force coefficient of the earthquake;it is recommended that the structure be calculated for horizontal and vertical earthquakes.Comparing and analyzing the calculation results of the structure under the consistent seismic input and the calculation results of the structure under the nonuniform seismic input considering the traveling wave effect,the results show that: the traveling wave effect has a significant effect on the seismic response of the structure;the influence of the traveling wave effect is concentrated in Near the support and the intersection of the longitudinal ridge arch and the transverse ridge arch;the traveling wave effect has different effects on the dynamic response of the structure,which is beneficial to some areas and disadvantageous to some areas;under the traveling wave effect,the three-way seismic excitation The structural seismic response is basically the same as the structural seismic response during X-direction seismic excitation;most components are more significantly affected by the traveling wave effect under threedirection seismic excitation.