Investigation of the effect of bracing on the performance and progressive collapse of steel tall buildings including long-span entrance and removed column

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KHEYRODDIN ALI; Pakdel Zahra; Maleki Fahimeh

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Journal Paper

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Journal: Modares Civil Engineering journal Year:2021 | Volume:21 | Issue:3 Page(s): 131-146

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Title

Investigation of the effect of bracing on the performance and progressive collapse of steel tall buildings including long-span entrance and removed column

Author(s)

KHEYRODDIN ALI | Pakdel Zahra | Maleki Fahimeh

Keywords

tall buildings

lateral loading

steel brace

removed column

Performance level

progressive collapse

Abstract

One of the essential points of interest for designers in constructing the tall building is to create a large entrance to the lower floors of the building. Such large openings are mainly because of architectural issues such as high traffic congestion, aesthetics, and parking. Creating these large openings, if accompanied by the removal of a column, connects the case with other structural issues such as the effect of the Construction sequence, progressive collapse, loads during execution, and the presence or absence of auxiliary supports (temporary piles) and making the problem more complicated. This study considered 36 regular structures of 10, 20, and 30 floors with a height of 40 to 120 meters with the Moment resistance frame system in the ETABS software. The Iranian National Building Code part 6 has used for load gravity of structures, and the Iranian standard No. 2800 has used for calculation and loading of lateral earthquake loads. After spectral dynamic analysis and Pushover analysis of the mentioned structures, we examined their behavior from the structural point of view and the effect of using bracing in one to four upper floors of the removed column. In the studied structures, evaluated the changes in plastic hinges formation, structural Performance level, Demand-Capacity ratio (DCR) of structural elements, period of the first mode, and drift in the exterior (non-corner) column removal. Also studied the effect of elimination on the exterior column to create a large entrance to the building on the probability of progressive collapse of the 10-story steel structure. The results showed that braces to strengthen the large span beam is a convenient and economical solution. In particular, the V braces show better performance than the Chevron brace if the number of braced floors above the desired span is before the building's inflection point. Because when the braces enter the area adjacent to the building's inflection point, they reduce the building's Performance level with failure in the pressure because of the low ductility in the pressure. The first plastic hinge at any Performance level starts from the inflection point. As a result, the use of low ductility elements in these areas reduces the structure's ductility. In most cases, V brace structures have smaller elements than structures with Chevron braces and are more economical. Buildings that are reinforced only by increasing the beam and column sections' dimensions without adding bracing have more strength than bracing structures. However, many sections' measurements compared to the braced buildings sometimes increase several times in this case. Therefore, this increase in strength will be accompanied by an enormous increase in cost. The results of pushover analysis and performance-based design showed that if the structure was designed from the beginning according to the standard code design, assuming the absence of columns, the building does not experience a reduction in performance and is better than using braces with higher ductility.

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APA: Copy

KHEYRODDIN, ALI, Pakdel, Zahra, & Maleki, Fahimeh. (2021). Investigation of the effect of bracing on the performance and progressive collapse of steel tall buildings including long-span entrance and removed column. MODARES CIVIL ENGINEERING JOURNAL, 21(3 ), 131-146. SID. https://sid.ir/paper/1036788/en

Vancouver: Copy

KHEYRODDIN ALI, Pakdel Zahra, Maleki Fahimeh. Investigation of the effect of bracing on the performance and progressive collapse of steel tall buildings including long-span entrance and removed column. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2021;21(3 ):131-146. Available from: https://sid.ir/paper/1036788/en

IEEE: Copy

ALI KHEYRODDIN, Zahra Pakdel, and Fahimeh Maleki, “Investigation of the effect of bracing on the performance and progressive collapse of steel tall buildings including long-span entrance and removed column,” MODARES CIVIL ENGINEERING JOURNAL, vol. 21, no. 3 , pp. 131–146, 2021, [Online]. Available: https://sid.ir/paper/1036788/en

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