Assessment of the Effects of Torsion in Steel Structures with Non-Parallel Lateral Resisting System with an Asymmetric Plan

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Khoshnam Mohammad; KHEYRODDIN ALI; KHODAKARAMI MOHAMMAD IMAN

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Journal: BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING Year:2018 | Volume:5 | Issue:2 Page(s): 73-89

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Title

Assessment of the Effects of Torsion in Steel Structures with Non-Parallel Lateral Resisting System with an Asymmetric Plan

Author(s)

Khoshnam Mohammad | KHEYRODDIN ALI | KHODAKARAMI MOHAMMAD IMAN | Issue Writer Certificate

Keywords

Non-Parallel Resisting System

Steel Moment Resisting Frame

Concentrically Braced Frame

Diaphragm Torsion

Nonlinear Dynamic Analysis

Pushover

Abstract

Since Iran is located in a seismic region and due to the existence of trapezoidal or triangular terrains, because cities were not constructed based on a grid format in the past, in addition to the interest of contemporary architecture in designing irregular structures and structures with non-parallel lateral resisting system as defined in the 4th edition of the Standard 2800, thus this paper studies the seismic behavior of such structures. In this paper, three-dimensional modelling of steel structures with five different plans, each representing a percentage of irregularities of the lateral resisting system and three-dimensional modelling of a completely regular plan is presented for comparison. Besides, the torsional behavior of structures with lateral resisting systems is studied and compared with regular structures. The letter alpha is used with indexes indicating the level of anomaly of the carrier systems. The value of the alpha index is obtained by dividing the length of the removed openings by the length of the entire structure. In order to investigate the effect of height, the structures were modelled and studied using two, four and twelve floor models. The modelled structures are made of steel and possess a specific steel converging bracing system in line with Y and a modular steel folding frame along X. Moreover, the soil on the land is of type 2 in accordance with the 4th edition of the Standard 2800, and the structures are in accordance with articles six and ten of National Building Regulations. To analyze the structures, Pushover analysis and dynamic linear analysis were implemented. In the Pushover analysis, a load was analyzed in line with X and another load was analyzed in line with Y. Furthermore, for dynamic linear analysis, the peak acceleration recorded for Tabas, Iran and El Centro, USA earthquakes were used. The final point is that loading in a state of non-parallel lateral resisting system (Y) will entail more unpredictable and disastrous results.

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APA: Copy

Khoshnam, Mohammad, KHEYRODDIN, ALI, & KHODAKARAMI, MOHAMMAD IMAN. (2018). Assessment of the Effects of Torsion in Steel Structures with Non-Parallel Lateral Resisting System with an Asymmetric Plan. BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING, 5(2 ), 73-89. SID. https://sid.ir/paper/265834/en

Vancouver: Copy

Khoshnam Mohammad, KHEYRODDIN ALI, KHODAKARAMI MOHAMMAD IMAN. Assessment of the Effects of Torsion in Steel Structures with Non-Parallel Lateral Resisting System with an Asymmetric Plan. BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING[Internet]. 2018;5(2 ):73-89. Available from: https://sid.ir/paper/265834/en

IEEE: Copy

Mohammad Khoshnam, ALI KHEYRODDIN, and MOHAMMAD IMAN KHODAKARAMI, “Assessment of the Effects of Torsion in Steel Structures with Non-Parallel Lateral Resisting System with an Asymmetric Plan,” BULLETIN OF EARTHQUAKE SCIENCE AND ENGINEERING, vol. 5, no. 2 , pp. 73–89, 2018, [Online]. Available: https://sid.ir/paper/265834/en

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