Analysis On The High-rise Tubular Structure With Horizontal Strengthened Stories

Horizontal strengthened stories can effectively reduce the lateral displacement of the high-rise tubular structures under lateral load. But the high-rise tubular structures with horizontal strengthened stories displayed the extremely complex response characteristic under the earthquake action, the setting of Horizontal strengthened stories can not only cause the mutation of vertical stiffness, and the redistribution of the structural internal force, but also easily form weak stories nearby the horizontal strengthened stories. Therefore, we must do detailed and accurate study and analysis on this kind of structure, master the response regularity of structure under the lateral load action and the plastic yield mechanism under the earthquake action especial under the rare earthquake action. It has very strong practical significance to develop work in this aspect. Acording to this propositions in this field, in this paper, several aspects work has been finished:(1) By several example discussion, We analyze the mechanical mechanism that the horizontal strengthened stories reduce structural lateral displacement, and analyze internal force redistribution phenomenon which is caused by the establishment of horizontal strengthened stories.(2) Based on the method of continuous analysis for the high-rise structure, the analytical expression of lateral displacement and internal force for the frame-tubular structure with horizontal strengthened stories are established, and quantitative analysis have finished on this aspect structure.(3) The influence of strengthened stories on the shear lag effect of the outer frame- tube in tube-in-tube structure is discussed through several examples.(4) The static elastic-plastic analysis (push-over analysis) on various structures are presented with horizontal strengthened stories, the plastic yield mechanism and ductility performance under earthquake action have been discussed in this paper. It is pointed out that weak stories will be formed nearby the horizontal strengthened stories. In the design we must take corresponding measures to ensure the deformability of the structure under rare earthquake action.(5) Based on the analysis of super high-rise structure, elastic dynamic response of the structure with horizontal strengthened stories is discussed, t the mutation of stiffness and internal forces and weak stories caused by strengthened stories are pointed out, then give some suggestions on designing this structure.