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Investigating the Effects of the Length of Yielding Area In Buckling-Restrained Braces

Khademi, Ziba | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51206 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. Structures having buckling restrained braces (BRB) as earthquake resisting system, have the qualities of high lateral stiffness and the ability to damp the energy coming from earthquake, at the same time.In addition to new structures, these braces can also be used in rehabilitating old steel or concrete buildings. By using this kind of resisting system, smaller sections are needed in design of buildings and also the cost of repair after earthquake can be highly reduced.The most important advantage of buckling restrained braces is their equal behavior and capacity in both tention and compression, that causes high energy absorption as a result of symmetric and stable cyclic behavior. All these mentioned advantages have expanded the use of BRBs as a good alternative of conventional braces and persuaded many researchers to study on optimum cases.BRB sections include two parts, one is the steel core that is designed to carry axial force and the other is designed to avoid buckling of the steel core and can be called restraining mechanism. In primary models the restraining part was made of concrete or a kind of composite, but in the new generation of braces this part is made of steel as same as the core section, and they are called all-steel buckling restrained braces which are very lighter than the concrete one. We have to use a frictionless material or make a little gap between the two parts of core and restraining mechanism, in order to eliminate any contact and force transmission between them.Many parameters can influence the amount of energy damping, deformation, local and global buckling of members. There have been many parametric studies so far, that have investigated many delicate design parameters such as the gap between parts, friction coefficient of the unbounding material and etc. to reach the optimum state.In this study we are up to investigate the effect of the length of yielding area on both story drifts and base shears.In order to obtain this goal, we need a finite element model to run a quasi-static analysis and so that observe the behavior of the member while cyclic loading. Then we will study the effect of the length of yielding area on drifts and shears in both low and middle raised frames, by using an incremental dynamic analysis (IDA)
  9. Keywords:
  10. Incremental Dynamic Analysis ; Drift ; Base Shear ; Buckling Restrained Braces Frame (BRBF)System ; Yielding Length

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