Performance-based Seismic Analysis And Design Method Of High-rise Steel Staggered Truss Structure

This dissertation studies the seismic performance and seismic design method of high-rise staggered truss system by pseudo-dynamic experiment and improved capacity spectrum method.First, a two-degree-of-freedom pseudo-dynamic test has been conduct on a 14-storied stagger truss structure model, whose scale is 1/8, and the characters of seismic response of the structure model, including damage process, deformation capacity, displacement response, base shear response, acceleration response and hysteretic behavior has been investigated. The results of the test state that stagger truss frame system has strong bearing capacity and lateral stiffness, the stiffness does not degrade apparently, and the seismic response can satisfy the displacement check of China seismic code and the design requirement of no damage under frequent earthquake , repairable damages under basic earthquake and no collapse under rare earthquake.Then, this dissertation constructs the improved capacity spectrum method, based on modal pushover analysis and elastoplastic demand spectum. The finite element software SAP is employed in the simulation analysis of the test structure to obtain the floor displacement and story drift envelope curves under 7-degree and 8-degree rare earthquake and the development of plastic hinges. These results coincide well with the test and it's time history analysis results, which validate the rationality of the improved capacity spectrum method proposed by this dissertation. And further, they indicate the stagger truss structure can satisfy the deformation and seismic protected requirements of China seismic code.Finally, the displacement-based seismic design method of high-rise staggered truss structure, which is based on the seismic resistance design requirement of"Two Phase and Three performance level"of Code for seismic design of buildings, is brought forth and applied in designing a 12-storey staggerd truss structure; Based on the theory studied above, a series model of actual projects are established and researched with the improved capacity spectrum method. The seismic performance of staggered truss structure, such as deformation, development of plastic hinges and energy dissipation, are studied by changing parameters including aspect ratio of structure, dimension of components, seismic intensity, span-depth ratio and vierendeel panel length, and design recommendations are presented as follows: the maximum aspect ratio is 4 under the condition of seismic fortification intensity of 8, staggered truss structure isn't applicable for the condition of seismic fortification intensity of 9, structure influence coefficient is 0.35 and the corresponding limited value such as flakiness ratio,slenderness ratio and axial compression ratio of components and so on.