Bulletin of Earthquake Science and Engineering

Bulletin of Earthquake Science and Engineering

Evaluation Damage Index of Steel Moment frames by Considering the Effects of Soil-Structure Interaction under Seismic Sequence

Document Type : Research Article

Authors
Alireza Karkabadi 1
Mohammad Iman Khodakarami 2
Farzaneh Nabati 3
1 M.Sc. Student in Earthquake Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 Ph.D. Candidate of Earthquake Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran
10.48303/bese.2021.245994
Abstract
1. Abstract
One of the main targets in designing structures is achieving adequate level of inter-story drift and ductility for controlling damage level. When a structure is subjected to sequential earthquakes, damage control becomes more critical. This seismic sequence as a result of the occurrence of strong and moderate earthquake ground motion in a short time strongly affects the seismic response of structures. Studies revealed that variation in the seismic responses such as displacement, ductility, absorbed energy etc. cause modifications in structural damage states. A damage index can numerically quantify the structural damage of buildings. Several damage indices have been developed for evaluating the seismic performance of structures.
The aim of this paper is to investigate the effect of seismic sequence of earthquake ground motion on the damage indexes variation and the seismic performance of steel moment frame structures considering soil-structure interaction (SSI). For the present work, the drift damage index is selected for measuring the story damage due to the inter-story drift. This index has been calculated by performing the nonlinear time-history analysis on a set of selected group of steel frames subjected to selected seismic excitations and sequential earthquakes.
2. Methodology
To this end, four steel moment frames with 8 and 16 stories are considered each of which three and six bays have. Soil-structure-interaction is considered by employing dampers and springs having specified damping and stiffness through cone method. For modeling SSI effects, three types of soil based on Standard 2800 are considered. For each soil-structure model, different responses are measured under different scenarios of sequential earthquakes.
3. Results and Discussion
The results of time-history analysis show that the relative displacement of the structure and inter-story drift are increased when the structure is subjected to the seismic sequence. As a result, the drift damage index induced to the structure. The study findings demonstrate as soil becomes softer, the structural demands increases and consequently the damage index rises and SSI amplified the structural damage level. Therefore, frames built on soft soil subjected to sequential earthquakes experienced more damages.
4. Conclusions
The obtained responses show that a special attention should be paid for designing of steel structures due to the preventing extensive structural damage in high seismic zone when they are subjected to seismic sequence excitation. Furthermore, soil-structure-interaction is an important parameter that should be considered for such conditions. Therefore, it is recommended that the effects of seismic sequence and soil-structure-interaction should be accounted for better estimation and evaluated accurate responses of steel shear frame.
Keywords
Seismic Sequence
Soil-Structure Interaction
Steel Frame
Frequency Content
Damage Index
Nonlinear Time History Analysis
Subjects
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  • Receive Date 09 August 2018
  • Revise Date 14 February 2021
  • Accept Date 11 May 2021