EVALUATION OF CYCLIC BEHAVIOR OF THE COLUMNS OF MOMENT FRAMES REGARDING THEIR SEISMIC DEMANDS, AND DEVELOPING THEIR CYCLIC DUAL LOADING PROTOCOLS

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FARAHI MOJTABA; ERFANI SAEED

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Journal: Modares Civil Engineering journal Year:2016 | Volume:16 | Issue:3 Page(s): 121-136

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Title

EVALUATION OF CYCLIC BEHAVIOR OF THE COLUMNS OF MOMENT FRAMES REGARDING THEIR SEISMIC DEMANDS, AND DEVELOPING THEIR CYCLIC DUAL LOADING PROTOCOLS

Author(s)

FARAHI MOJTABA | ERFANI SAEED | Issue Writer Certificate

Keywords

SEISMIC DEMANDSQ2

CYCLIC LOADING PROTOCOLQ2

COLUMN MEMBERSQ2

SPECIAL MOMENT FRAMESQ2

Abstract

Columns of the moment frames are subjected to high axial forces as well as inelastic rotations during a seismic event. Estimating the boundaries for these simultaneous structural demands on the columns of SPECIAL MOMENT FRAMES are one the aims of this research. These demands are evaluated by performing a vast number of non-linear time history analyses on some archetype frames. Totally, eight archetype buildings are designed under two levels of spectral accelerations representing the Maximum Credible Earthquake (MCE) and the Design Earthquake (DE). Both geometric and material nonlinearities are taken into account. Far-field earthquake record set -proposed by FEMA P696- is utilized in this study to conduct the required time history analyses. This set includes 44 individual seismic records with different magnitudes and other specifications. Each sample special moment frame is excited by each of the individual records with two different intensity levels referring to DE and MCE respectively. After performing numerous time history analyses, the boundaries and the values for the axial force and the story drift ratio on columns are fairly stablished for the seismic events with MCE and DE intensity levels. It is proved that the columns might experience the axial force around 30% of their yielding capacity as well as the drift ratios up to 6%. Effects of simultaneous changes in axial force and plastic rotation in such columns are neglected in available loading frameworks (protocols, setups, what?!) for these members. On the other hand, existing loading frameworks are introduced quite arbitrarily in different research studies, with no root in the real SEISMIC DEMANDS of these structural members. Hence, a statistical approach implemented to extract the loading cycles based on the results of the mentioned non-linear time histories. Therefore, a representative loading protocol is also developed for the COLUMN MEMBERS of SPECIAL MOMENT FRAMES with the aid of the results of the supportive analyses. This loading protocol includes cycles of varied axial force ratios as well as simultaneous cycles of lateral loading.Providing such a loading regime can pave the way to investigate the behavior of the columns of moment frames by more sophisticated numerical models which cannot be ordinarily employed to perform costly time history analyses under seismic records. The overall response of steel columns may be dominantly affected by the local effects like as local bucking at large deflections. Hence, the response of some archetype individual columns is fairly investigated under the proposed loading protocol by utilizing continuum finite element simulations which are expected to capture these kinds of local effects deliberately. The investigation not only reveales more on the details of the behavior of these members, but also proves the versatility of the proposed loading protocol in comparison with the previous loading procedures. In order to do so, the numerical models of the archetype columns are also examined under the proposed lateral loading protocol. Accordingly, constant levels of axial loading and the results of both cases are compared. It is shown that implementing a constant axial load besides the cyclic lateral cyclic loading may not be an appropriate loading framework and the results would not represent the SEISMIC DEMANDS in these members accurately.

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APA: Copy

FARAHI, MOJTABA, & ERFANI, SAEED. (2016). EVALUATION OF CYCLIC BEHAVIOR OF THE COLUMNS OF MOMENT FRAMES REGARDING THEIR SEISMIC DEMANDS, AND DEVELOPING THEIR CYCLIC DUAL LOADING PROTOCOLS. MODARES CIVIL ENGINEERING JOURNAL, 16(3), 121-136. SID. https://sid.ir/paper/256684/en

Vancouver: Copy

FARAHI MOJTABA, ERFANI SAEED. EVALUATION OF CYCLIC BEHAVIOR OF THE COLUMNS OF MOMENT FRAMES REGARDING THEIR SEISMIC DEMANDS, AND DEVELOPING THEIR CYCLIC DUAL LOADING PROTOCOLS. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2016;16(3):121-136. Available from: https://sid.ir/paper/256684/en

IEEE: Copy

MOJTABA FARAHI, and SAEED ERFANI, “EVALUATION OF CYCLIC BEHAVIOR OF THE COLUMNS OF MOMENT FRAMES REGARDING THEIR SEISMIC DEMANDS, AND DEVELOPING THEIR CYCLIC DUAL LOADING PROTOCOLS,” MODARES CIVIL ENGINEERING JOURNAL, vol. 16, no. 3, pp. 121–136, 2016, [Online]. Available: https://sid.ir/paper/256684/en

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