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Life Cycle Cost Analysis and Value Based Seismic Design of Steel Structures

Beheshtian, Behnam | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46823 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanch, Homayun
  7. Abstract:
  8. Life-cycle cost analysis (LCCA) is an assessment tool for studying the performance of systems in many fields of engineering. In earthquake engineering LCCA demands the calculation of the cost components that are related to the performance of the structure in multiple earthquake hazard levels. In this work structural performance required for LCC estimation is achieved by performing ET analysis, while Incremental static and dynamic analyses are two procedures that can be traditionally used for estimating the seismic capacity of structural systems. In this method the structure is subjected to an increasing accelerogram which its time represents ascending earthquake intensities corresponding to ascending performance levels. Reduced computational demand in ET analysis method provides the prerequisites to practical use of LCCA for numerous structures. In this research 6 groups of 3 to 8 story moment frames (each group encompassing about 20 frames) were analyzed through equivalent static analysis approach. The design was performed by using of ETABS Auto Select Section List feature. In the next step each frame performance was assessed through nonlinear ET analysis (using OpenSees), which provided required inputs for LCC analysis. After performing life cycle cost analysis and achieving each seismic damage cost component for each structure, the costs were scaled and optimum graphs were plotted.
    By using the optimum graphs, designers will be able to choose an appropriate shear coefficient for designing their structures based on minimum total costs, so the resulted structures will be more economically efficient. The distribution of max interstory drifts indicated for accommodating significantly lower life cycle costs, the code based load distribution pattern over the height of the structure needs some improvements. At the end for acquiring more realistic LCCs some modifications in prevailed LCCA procedure is suggested
  9. Keywords:
  10. Endurance Time Method ; Nonlinear Dynamic Analysis ; Life Cycle Cost (LCC) ; Steel Frames ; Earthquake Code 2800 ; Value Based Seismic Design

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