An investigating into the effect of various modeling parameters on the behavior of special steel moment frames

Document Type : Research Article


1 M.Sc. of Structural Engineering, Faculty of Engineering, Iran, University of Mohaghegh Ardabili

2 civil engineering, engineering and technology department of mohaghegh ardabili university, Ardabil, iran


In this paper, the effect of various modeling parameters such as beam-column connections, soil and shallow foundation types are studied to assess the seismic response of steel moment frames. For this purpose, five-story special steel moment frames with two different soil types (II and IV) were considered. The footing and strip shallow foundations were designed for these buildings, with a safety factor of three. Prequalified bolted flange plate connections were used in these buildings. The finite element models were developed using OpenSees software considering soil – foundation – structure interaction. The seismic performance of SMFs was evaluated using nonlinear time history analyses, through seven far–fault ground motions. Nonlinear behavior of soil was modeled by nonlinear Winkler springs. The numerical results showed that in the models that considered beam-column connections, SFSI and soil type IV, the maximum inter-story drift was more, compared to models without connections and with fixed based conditions. The maximum base-shear force of structures in the mentioned models was reduced. In models, that structures rested on soil type II, maximum values of these two parameters were diminished. The effect of foundation type in models resting on the soil type IV was more than models with soil type II. Generally, connections, foundation type and soil-foundation-structure interactions have a great influence on the nonlinear responses of steel moment frames.


Main Subjects

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