Investigation On Some Key Issues Of Dynamic Elastic-plastic Analysis And Its Application For High-rise Buildings Beyond Code Limits

More and more skyscrapers have been built up since Reform and Opening, along with social economy rapid development and urbanization. And stern requirements are brought forth for those super high-rise buildings by Chinese seismic code, because of the particularity on their economic effect and social function. Dynamic elastic-plastic time history analysis is needed for their seismic design. Therefore, with the increase in super high-rise buildings, the demand for dynamic elastic-plastic time history analysis is getting stronger, and researchers start paying more attention to this field. From several key works of dynamic elastic-plastic time history analysis, this paper puts forward a newly improved modeling method and gives some advice about choosing proper element types and seismic waves for analysis. Besides, this paper develops a material subroutine of concrete which can be used in beam elements, making up for the drawback of the software.The newly modeling method proposed in this paper uses ANSYS programming design language (APDL) to debug the initial model exported from MIDAS (or PKPM) and then write a program that can generate a ABAQUS model data file automatically. This method can save a lot of calculating time and ensure a convergence result, in the meantime, remedy the lack of efficient model modifying ability for ABAQUS. In addition, introduce a new type of shell element to simulate shear wall in the numerical model, which can save a large number of computing time too.Based on ABABQUS secondary development platform, program a concrete material subroutine C0. In the axial compression test and Low cyclic loading test, specimens using this subroutine show hysteretic behavior and stiffness degradation successfully. Moreover, it is still proved effective in actual projects.By comparing results of3seismic waves with different spectral characteristics loading on a same frame-shear wall structure, get a conclusion that the value of a seismic acceleration peak influences less than the period range of that peak acceleration. So when choosing a seismic wave for dynamic time history analysis, we can select those which have a close period range to demanded waves, and lower the requirement on the peak value.Al last, put the achievement of this paper into application on an actual super high-rise building project, to check its working effect.