Development of design method for structures equipped with a combination of yielding metallic dampers based on performance objectives

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Ahmadi Mohammadhasan; AGHAKOUCHAK ALI AKBAR

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:5 Page(s): 1-17

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Title

Development of design method for structures equipped with a combination of yielding metallic dampers based on performance objectives

Author(s)

Ahmadi Mohammadhasan | AGHAKOUCHAK ALI AKBAR | Issue Writer Certificate

Keywords

Performance Based DesignQ2

Uniform Hazard SpectrumQ1

Yielding Metallic DamperQ1

Nonlinear Static AnalysisQ2

Nonlinear Time-history AnalysisQ2

Abstract

One of the effective ways to mitigate earthquake damage in structures is passive control of structures. Yielding Metallic Dampers are economic passive control devices, which are easy to fabricate and install on the structure. In this paper, the aim is to develop a design procedure for steel structures equipped with a combination of Yielding Metallic Dampers so that, dampers will experience specific nonlinear behavior when subjected to various seismic hazard levels. For this purpose, the first step is to have the seismic hazard spectra with different return periods for the intended site of construction. In this research, this step has been taken by using the Tehran probabilistic analysis hazard project data and then plotting uniform hazard spectra with 75-year, 475-year, 975-year and 2475-year return periods. In the next step, behaviors of structures equipped with Yielding Metallic Dampers have been investigated in the form of one-storey one-span, one-storey two-span and multi storey multi span frames. Required equations for behavior of these structures under monotonic loading is developed to begin the design process, the performance criteria for the structure and the damper is proposed. By using the derived equations, design of one storey, one span frame, as single degree of freedom structures based on performance criteria has been carried out. These single degree of freedom structures have different periods and strength reduction factors. After designing the single degree of freedom structures, Nonlinear Static Analysis results have been compared with result of nonlinear time history analysis. For this purpose, 7 earthquake records have been chosen and scaled based on Iranian code of practice for seismic resistant design of buildings and used for dynamic analysis. Results have shown that all performance criteria of 75-year and 475-year hazard levels have been satisfied but for 975-year and 2475-year hazard levels, six cases have satisfied the desired critera with 12 percent error. Performance criteria for dampers used in multi degree freedom structures have also been proposed and a method for designing these systems based on the concept of uniform drift in all stories have been presented. Three, 3-storey, 6-storey and 9-storey buildings equipped with dampers have been designed based on proposed method. Time history analysis have been carried out for each return period to check if the desired performance have been achieved. For these analyises, 7 earthquake records were chosen and scaled based on Iranian code of practice for seismic resistant design of buildings. Comparison of performance point displacement levels and the displacements obtained from 28 nonlinear analyses, has shown up to 13 percent error. Meanwhile, the displacement levels of each set of dampers for 75-year, 475-year, 975-year and 2475-year return periods, confirmed efficiency of proposed design method and all dampers met the mentioned performance criteria. The results also showed that when hazard level increased, the difference between the results of nonlinear time history analyses and static nanlinear analyses have also increased.

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APA: Copy

Ahmadi, Mohammadhasan, & AGHAKOUCHAK, ALI AKBAR. (2018). Development of design method for structures equipped with a combination of yielding metallic dampers based on performance objectives. MODARES CIVIL ENGINEERING JOURNAL, 18(5 ), 1-17. SID. https://sid.ir/paper/256897/en

Vancouver: Copy

Ahmadi Mohammadhasan, AGHAKOUCHAK ALI AKBAR. Development of design method for structures equipped with a combination of yielding metallic dampers based on performance objectives. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(5 ):1-17. Available from: https://sid.ir/paper/256897/en

IEEE: Copy

Mohammadhasan Ahmadi, and ALI AKBAR AGHAKOUCHAK, “Development of design method for structures equipped with a combination of yielding metallic dampers based on performance objectives,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 5 , pp. 1–17, 2018, [Online]. Available: https://sid.ir/paper/256897/en

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