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Analysis of Seismic Performances of Super Braced High-Rise Steel Structures

Author: YangChao
Tutor: OuJinPing
School: Dalian University of Technology
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Super Brace Buckling Restrained Brace Pushover Analysis Failure Mode
CLC: TU973.31
Type: Master's thesis
Year: 2011
Downloads: 293
Quote: 3
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Abstract

As the development of social economy and the growth of city population, there are a large number of tall buildings built over the past few years. In developed countries, tall steel buildings are used widely because of the advantages such as light weight, hard stiffness, good deformation capacity, short construction period, and so on. As the steel annual output of China has been the top one in the world for years, steel buildings are considered to be the trend of development here.Lateral stiffness is is one of the most important factors considered during the design of tall steel buildings and there are a large number of researches on structures with traditional braces which are used to control the lateral displacement. However, for the super braced high steel buildings, the researches is still limited, despite the fact that there are a huge number of them being built or built already. In this paper, we will study the seismic performances of this kind of buildings and compare their performances with others. The main contents are as follows:(1) The design of four structures including a frame, a super braced frame, a mega frame and a mega braced frame under the same load and using conditions, with nearly the same steel consumption, the model and response spectrum analysis of these four structures, and the comparision of results.(2) The pushover analysis of the four structures designed and the comparision of results in rare earthquake, failure mode and the seismic capacities of the models.(3) Taking 2-D super braced frame as an example, discuss the seimic performances using model, response spectrum and pushover analysis when the cross section and joint connection of the super braces are changed.(4) Taking 3-D super braced frame as an example, discuss the seimic performances using model, response spectrum and pushover analysis when the disposal mode of super braces is changed.(5) Replace the buckling parts of super braces with buckling restrained braces, and compare the results of pushover analysis before and after the replacement.The results show:Super braced high steel buildings have a large lateral stiffness, but the buckling of super braces could induce a significant degradation of stiffness. Enlarging the cross section of super braces in certain range can improve the stiffness and load-bearing capacity of the models. The models with different joint connection systems have the same linear stiffness, but the models in which the super braces connect to the structures using hinge connections have a lower inlinear load-bearing capacity. The structures that designed follow the the three-dimensional principium and has a wider lateral force resistant system perform better in the pushover analysis. Buckling restrained braces can avoid the fast degradation of stiffness and load capacity that caused by the buckling of ordinary braces and improve the integral seismic capacity of super braced structures.

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CLC: > Industrial Technology > Building Science > High-rise buildings > Tall Building Structures > A variety of structural design > Seismic Design
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