| Outrigger-braced structure is widely used in high-rise building in many practical projects nowadays. It can reduce the floor displacement, improve anti-seismic ability effectively. Meanwhile, there are many reference theories in establishing belted-outtrigger, B.S.Smith's theory of optimal belted-outrigger is chosen in this thesis. Based on the theory, a high-rise frame-tube structure is established by using general finite element software Ansys. The structure is set in six different belted-outrigger plans under the action of earthquake, and it's analysed by adopting time-history analysis. The main contents are as below:1. The high-rise frame-tube structures without belted-outrigger and with belted-outrigger are analysed respectively by adopting modal analysis method, and structure vibration frequency and vibration model are got in different setting plans. The following analysis is based on the results above.2. The changing curve with time of top displacement and the floor displacement angle are got in different setting plans through time-history analysis. It can reflect control effect of belted-outrigger intuitively. The structure internal force is compared in different belted-outrigger plans, and the influence with belted-outrigger structure under earthquake is analysed.3. Based on the results above, the structure with proper belted-outrigger can enhance the anti-sesmic ability effectively. The dynamic characteristics influencing regularity of the structure is summed in different belted-outrigger plans. It's proved that belted-outrigger can reduce the displacement and improve the lateral stiffness.4. Based on B.S.Smith theory of optimal belted-outrigger, time-history method is used to calculate the stucture response, and the optical location of setting single belted-outrigger in the structure is got. Comparing with the theoretical value, the universal applicability of B.S.Smith theory is proved. A reference for practical engineering problems is provided by the result. |
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