Seismic Performance Analysis And Parameter Optimization Of Main Structure Of A Small And Medium - Sized Stadium

At present, in our country, a lot of small and medium-sized stadiums with unique architectural modeling, irregular plane and uneven vertical stiffness and some other characteristics appear in many country-level cities in Jiangsu region. This kind of stadium not only comply with the aesthetic standard of architectural structure, but also accord with the concept that let people into sports and sports culture which strongly advocated by the government, thus, it has a very good development prospect. But so far, research on seismic performance for main structure of the small and medium-sized stadiums is less, in addition, our country is an earthquake-prone country with vast and dispersed earthquake area and frequent and intense earthquake occurring, therefore, seismic analysis on main structure of this kind of small and medium-sized stadium has important practical significance.In this paper, for a practical engineering example, we use element software ANSYS to analyze its dynamic time history response under the action of 3d frequently and rarely occurring earthquake, and also carry on the parameter optimization research for main structure of small and medium-sized stadium, the obtained conclusions are shown as the follows:(1) According to the analysis of main structure of stadium, acquire the natural period of main structure of stadium’s western ang southern area, natural frequency of the structure is intensive and overall stiffness of the structure is big and uniform, Torsion effect is obvious.(2) According to the analysis on seismic response of stadium’s main structure under the action of 3d frequently and rarely occurring earthquake, we can obtain displacement on the top and shear force at the bottom of the column 10D,8D,6D,4D,2D in X, Y, Z direction. Based on the results, we can find that among the displacements, that of the column 10D in X, Y, Z direction is the biggest, and among shear forces, that of the column 2D in X, Y direction is the biggest, and story drift angle of each column can meet the criterion limit.(3) According to the analysis on seismic response of stadium’s main structure under the action of one and three dimensional frequently and rarely occurring earthquake, the seismic response under three dimensional earthquake has a different degree of increase when comparing to that under one dimensional earthquake. Among that, under frequently occurring earthquake, the largest increase of average horizontal displacement occurs in X direction of column 10D, and the largest increase of average horizontal shear force occurs in Y direction of column 2D. Therefore, not only one dimensional but also three dimensional earthquake effect to structure should be taken into consideration during seismic design.(4) Four factors are selected in orthogonal test which are support angle, column section area, circumferential span, aspect ratio, each factor has 3 levels, L9(34) orthogonal table is chosen as orthogonal experiment program, displacement on the top and shear force at the bottom are examination index, this paper has analyzed the seismic response of structure under the action of 3d frequently occurring earthquake wave EL Centro, and the effect of each factor in each level has been taken into the analysis.