The Analysis Of Seismic Performance On Mixed Structure Involving Different Material Damping Ratio

With the development of our national economy and society, the steel roof and the concrete structure of the hybrid structure was widely favored. Because the structure consists of two completely different materials,the damping ratio of the two material is very different in the actual engineering design,we always use rules and regulations in the synthesis of damping ratio method to calculate or the lower part of the reinforced concrete structure and the upper part of the steel structure are considered respectively. What is the influence of the structural design? Based on the T3A international airport terminal in xianyang xi'an, and the lower part of the reinforced concrete structure and the whole structure by rules and regulations of damping ratio and group of damping ratio to calculate respectively, Research on the mode, displacement and cycle of the structure.The main works of this paper are:(1) through a specific project, girder will substitute for steel truss according to certain rules, To approximate consider rigidity of steel truss model for overall,and then analysis in PKPM, Compared the result to the upper part of steel truss and the lower part of concrete structure considering by group as a whole with the group damping ratio comparative analysis in Midas Gen. (2) precise damping model that group of damping ratio works elastic analysis through a specific example of the project, and then to adopt same project design with integrated damping ratio, the displacement is calculated, and last compared to the difference among internal force, cycle displacement in the two methods.The main conclusions of this paper are:(1) in the structural design, it is very important to consider the upper and lower structure influence each other in hybrid structure. Generally speaking, the lower structure is bearing of the upper structure, the impact of static structure is very big for bearing of moving. Especially near to the roof, it is more obvious. Therefore,it is very necessary for this kind of structure to analysis undertake integral analysis. (2) in this project, Compared to the analysis with the Miads Gen special group of damping ratio and the comprehensive damping ratio for the whole structure,it is no obvious, it can meet the engineering requirement.