Study of the Impact of Pounding of Steel Moment Frames due to Sequential near- and far-fault Earthquakes

Document Type : Research Article

Authors

1 Department of Civil Engineering, Institute for Higher Education ACECR, Khouzestan, Iran

2 Department of Civil Engineering, Abadan Branch, Islamic Azad University, Abadan, Iran

3 Department of Civil Engineering, Institute for higher education ACECR, Khouzestan, Iran

Abstract

Seismic codes are a pioneer in providing seismic criteria in the nonlinear behavior of structures, but usually less attention is paid to the two main phenomena. The first is the phenomenon of impact of adjacent structures, which can cause severe nonlinear behaviors, and regulations usually suggest a discontinuous joint between two structures to prevent its effects on adjacent structures, but if necessary, the impact of pounding with a discontinuous joint is investigated. Or implemented, no proposal is presented, and the second is the effects of seismic sequencing. In this paper, in order to investigate the impact of adjacent steel moment structures due to successive earthquakes near and far fault, six pairs of steel frames with different heights, with and without height difference on the ground floor have been used. These frames have been evaluated using nonlinear time history analysis under the effect of 24 consecutive earthquakes in the near and far faults in the form of three sequential seismic composition scales that have been scaled according to the fourth edition of the 2800 standard. The results of the study showed that the joint seam did not prevent adjacent frames from colliding with each other and needed to be reviewed, but compared to the frames in contact, which in most cases hit the frames together led to the collapse of the structure, is more appropriate and reduces damage. Impact force changes the behavior of adjacent colliding frames relative to the expected behaviors of the frames without impact and exhibits different responses.

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