Effect of soft ground story on the collapse possibility of the moment resistance frames under near and far-fault earthquakes

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SABERI VAHID; Salehi Shahrabi Tahere; SABERI HAMID; AHMADVAND MASOUD

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:2 Page(s): 149-158

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Title

Effect of soft ground story on the collapse possibility of the moment resistance frames under near and far-fault earthquakes

Author(s)

SABERI VAHID | Salehi Shahrabi Tahere | SABERI HAMID | AHMADVAND MASOUD | Issue Writer Certificate

Keywords

Irregular structuresQ1

Soft storyQ1

Fragility curveQ1

Near and Far faultQ1

Steel moment resistance framesQ1

Abstract

Soft story in the ground floor is established due to the open space for establishing shops, parking lots or even schools. With regard to the observations of the risks of past earthquakes, such as the 921 Chichi earthquake, Kobe 1995, Bam 2003, and Kashmir 2005, and destructive effects imposed on the Soft story, which even caused the collapse of the building. This paper aims to study the effect of Near and Far fault earthquakes on the two series of mid rise and low rise moment resistance frames. In the both series, a regular frame with the height of 3. 2 meter and two irregular frames with soft ground story with the height of 4. 5 and 5. 5 meters are evaluated. Incremental dynamic analysis is a parametric analysis method that has become common in recent years for estimating the functional level of a complete building under seismic loads. Construction models are created under one or more earthquake records with varying intensity and one or more response curves are produced by the seismic intensity value. The intensity of the records applied on the structure added during analyzes is represented by the parameter IM and the output of the analyzes, which is the response of the construct to the stimulus, with the parameter DM. The IDA curves actually draw the relation between the structure response (DM) to the change in the intensity (IM) of the records. Selected parameters for IM and DM should be well represent the effects of earthquake and structural behavior. The algorithm used for the record scale is a conventional step-by-step algorithm. The step-by-step algorithm can be considered as the easiest way to understand and program. Analyzes continue with increasing levels of IM with equal steps until convergence is achieved (an indication of overall dynamic stability). In this case, the user will only need to select the IM step and the maximum number of dynamic analyzes to get the results. To express the scale level, we need to have a preliminary and temporary selection of IM (which is measurable). After a nonlinear dynamic analysis, one or more curves of the structure response (DM) are obtained in terms of different levels of ground movement (IM). Finally, the performance of the structure is evaluated by defining the extreme states and processing the results using probabilistic relationships. The data obtained from the IDA analysis provides an insight into the behavior of the structure, and is a bridge between the results of the additional static load analysis and the dynamic response In this paper the parameter of IM corresponding to the maximum of inter-story drift and the parameter of DM corresponding to the spectral acceleration of the first mode (T1, 5%) Sa were considered. In addition, the collapse-preventing performance level of CP was analyzed. The results obtained from the Fragility curves in the mode of CP indicate that with the height increase of Soft story and consequently becoming softer, the ten percent collapse possibility of mid rise structures in the near fault records was decreased more than far fault ones. However in the low rise structures, it has greater reduction in the far fault records than near fault ones.

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APA: Copy

SABERI, VAHID, Salehi Shahrabi, Tahere, SABERI, HAMID, & AHMADVAND, MASOUD. (2018). Effect of soft ground story on the collapse possibility of the moment resistance frames under near and far-fault earthquakes. MODARES CIVIL ENGINEERING JOURNAL, 18(2 ), 149-158. SID. https://sid.ir/paper/256786/en

Vancouver: Copy

SABERI VAHID, Salehi Shahrabi Tahere, SABERI HAMID, AHMADVAND MASOUD. Effect of soft ground story on the collapse possibility of the moment resistance frames under near and far-fault earthquakes. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(2 ):149-158. Available from: https://sid.ir/paper/256786/en

IEEE: Copy

VAHID SABERI, Tahere Salehi Shahrabi, HAMID SABERI, and MASOUD AHMADVAND, “Effect of soft ground story on the collapse possibility of the moment resistance frames under near and far-fault earthquakes,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 2 , pp. 149–158, 2018, [Online]. Available: https://sid.ir/paper/256786/en

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