The Analysis On Seismic Response Of Framed-tube Structure With Belted-outrigger

Outrigger-braced structures as a modification of framed-tube structures is widely used in high-rise buildings, for it has a outstanding merit to improve the lateral stiffness, reduce the floor displacement and lessen the moment of the tube. Many theories on this aspect have been put forward. Among these theories, the most representative one is professor B. Stanford. Smith' s theory, which was made out from a planar model. Based on this theory, the thesis conducts a space dynamic analysis on a framed-tube structure that has different belted outrigger plans. The main contents of the analysis are listed out as below:(1) On the basis of the FEA theory, uses the general FEA software ANSYS to set up a structure model.(2) Through the modal analysis, compares and sums up the change of the free vibration characters of the model under different belted outrigger plans.(3) By the means of response spectrum analysis, conducts horizontal seismic analysis to the model. Compares the force and displacement of the model under different belted outrigger plans. Then, gives suggestions on seismic design of the outrigger-braced structures.(4) From the results of the seismic analysis, try to probe the rule that how the belted outrigger works to reduce the displacement and improve the lateral stiffness.(5) Put forward advices on locating the optimum position of the belted outrigger. Moreover, gives the optimum position, when only one belted outrigger is to be settled.