| The stadium in Sandu Shui Autonomous County of Guizhou Province is a hybrid structure composed of steel grid-frame structure and reinforced concrete structure.In order to simplify the calculation of mixed structure of stadium and gymnasium,steel grid-frame structure and reinforced concrete structure are often considered separately,and different software is used to calculate and analyze the steel grid-frame structure and reinforced concrete structure separately.However,such a method is only an approximate method,and it is often unable to accurately obtain the actual stress of the structure.At the same time,because the reinforced concrete structure of Sandu Stadium is not provided with structural joints,an annular closed super-long concrete structure is formed,and there is a significant difference in the time when seismic waves are transmitted to the bottom of the structural vertical members.Therefore,in combination with the seismic response analysis method of long-span spatial structures and the relevant theories of spatial variability of ground motions,the author studies the seismic performance and static and dynamic characteristics of the structure through overall modeling of the hybrid structure and the analysis of the overall model.At the same time,the difference of seismic response between the single model and the whole model is analyzed,and it is expected to play a reference role in the design of the hybrid structure of large-span stadiums and gymnasiums.The main research work and results are as follows:(1)Taking sandu stadium as the research object,the comparison and selection of structural schemes were carried out based on the results of computer calculation and conceptual design,and the reasonable structural design scheme was determined.(2)The response spectrum analysis and elastic time history analysis of the simplified model of reinforced concrete structure and the whole model of hybrid structure are carried out respectively by using Midas Gen finite element software.The differences between the individual modeling design and the overall modeling analysis of reinforced concrete structures are compared.By comparison,it is found that the horizontal reaction of the supports obtained by the separate modeling of the steel grid structure is safer in most positions than that obtained by the overall modeling of the hybrid structure.However,in some locations,the horizontal reaction of the supports obtained by the separate modeling of the steel grid structure is less than the overall model calculation value,which is unsafe.At the same time,the vertical reaction force shows an oscillating trend,and the vertical reaction force at the valley position of the oscillation change is smaller than the overall model calculation value.Therefore,it is recommended to perform overall check analysis of the structure on the basis of separate design when designing the hybrid structure.(3)The elastic-plastic time history analysis of the whole model of hybrid structure of Sandu Stadium shows that the Sandu Stadium has good seismic performance under the rare earthquake of 6 degree.At the same time,under the rare earthquake of 7 degree(0.1g),although the structure is damaged,it will not collapse,and the third level of seismic fortification requirements can be achieved.(4)The multi-point excitation analysis considering traveling wave effect of Sandu Stadium hybrid structure model is carried out,and the influence of traveling wave effect on structure response is discussed.The results show that when considering the traveling wave effect of ground motion,the internal forces of cantilever columns arranged in a circle around the structure are completely overloaded compared with the uniform excitation.Therefore,it is suggested to adjust the internal forces of the peripheral side columns and corner columns when the actual engineering is designed separately. |
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