Probabilistic assessment of sidesway collapse of mid-and high-rise steel buildings with special moment resisting frame

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Mobinipour Seyed Ahmad; pourzeynali saeid

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:5 Page(s): 189-202

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Title

Probabilistic assessment of sidesway collapse of mid-and high-rise steel buildings with special moment resisting frame

Author(s)

Mobinipour Seyed Ahmad | pourzeynali saeid | Issue Writer Certificate

Keywords

Intensity MeasureQ1

Demand MeasureQ1

Earthquake hazard levelsQ1

Performance levelsQ2

Median collapse capacity intensityQ1

Abstract

In order to determine and predict the possible damage imposed on the structures, performance-based standards have presented certain levels and limits. The current study aimed to make a probabilistic evaluation of the special steel moment frames exceeding these levels through comparing the Demand Measure (DM) and the Intensity Measure (IM). It further tried to examine the performance of the sixth and tenth issues of the national regulations and Iranian 2800 standard in confining the damage imposed on this type of structures. The results of DM probabilities analysis based on IM parameter could be expressed in two ways: 1) the fragility curve of the probability exceeding the limit states, and 2) assessment of the probability of the annual mean exceedance of the limit states. Among numerous types of limit states, the global collapse of the structure is of utmost significance. The present study utilized both forms of these analyses. In the first phase of the research, cumulative distribution function (CDF) curves were used to assess the performance of the structures subjected to the records of various risk levels according to FEMA-350 guidelines. To this end, a ten-story and a twenty-story special steel moment resisting frame were modeled in OpenSees software. Then, fragility curves of the frames collapse were drawn at three Performance levels of immediate occupancy (IO), collapse prevention (CP), and global instability (GI) through using the incremental dynamic analysis (IDA) and by means of the records introduced in The Next Generation Attenuation (NGA) for near-and far-fault records. Then, in the second phase of the study, the collapse probability of the structures under the study was estimated for Tehran city, which is located at a high seismicity zone. It is worth noting that these structures were designed and loaded according to the existing guidelines and were considered at the risk level 2 (risk level 2 according to the FEMA 356 and Iranian 360 guidelines) under the influence of the earthquake. Moreover, the Median collapse capacity intensity (Ŝ CT) was calculated indicating the acceleration at which the structural collapse probability equals to 50%. Finally, the aforementioned curves were used and the probability exceedance of the frames under the study were obtained from three risk levels with the return periods of 75, 475 and 2475 years and the damage imposed on the frames were assessed and compared. The findings indicated that: 1) the special moment resisting frames influenced by the far-and near-fault records were safe at the Performance levels of IO, CP, and GI and hence, the purpose of the seismic design and loading guidelines was fulfilled, 2) in general, the seismic response of the structures due to near-fault ground motions is more critical compared to those of the far-fault ones, but with an increase in the number of stories in high-rise building structures, the effect of far-fault ground motions on seismic response of the structure increases so that no significant difference would be observed in the structural ductility demands due to near-fault and far-fault ground motions, and 3) the highest certainty coefficient belonged to the ten-story frame under the influence of far-fault records and the lowest certainty coefficient belonged to the twenty-story structure under the influence of near-fault records. This clearly demonstrated the influence of increasing the height of the structure on its collapse probability and the impact of near-fault records.

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APA: Copy

Mobinipour, Seyed Ahmad, & pourzeynali, saeid. (2018). Probabilistic assessment of sidesway collapse of mid-and high-rise steel buildings with special moment resisting frame. MODARES CIVIL ENGINEERING JOURNAL, 18(5 ), 189-202. SID. https://sid.ir/paper/256898/en

Vancouver: Copy

Mobinipour Seyed Ahmad, pourzeynali saeid. Probabilistic assessment of sidesway collapse of mid-and high-rise steel buildings with special moment resisting frame. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(5 ):189-202. Available from: https://sid.ir/paper/256898/en

IEEE: Copy

Seyed Ahmad Mobinipour, and saeid pourzeynali, “Probabilistic assessment of sidesway collapse of mid-and high-rise steel buildings with special moment resisting frame,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 5 , pp. 189–202, 2018, [Online]. Available: https://sid.ir/paper/256898/en

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