Effect of Foundation Flexibility on the Capacity of Concrete Moment Frames with Shear Wall

Document Type : Research Article

Author

Department of Civil Engineering/ Tafresh University/ Tafresh/ Ian.

Abstract

Considering the soil-foundation-structure interaction (SFSI) in the structural modeling procedure can change the seismic structural response. However, the SFSI effects are mostly ignored in the analysis procedure of structures, as a general engineering belief regarding its conservative effects. This conservation is not always the case, although the period and the damping of structures change by considering SFSI effects and consequently, the seismic demand decreases. The aim of this paper is to evaluate the influence of foundation flexibility on the capacity of concrete moment frames with the shear wall. For this purpose, the beam on nonlinear Winkler foundation approach is used, which is a simple and efficient method. First, a collection of 3, 6 and 10 storied reinforced concrete moment resisting frames founded on soft, medium and hard soils are designed based on FEMA450. After the implementation of frames in Opensees software, a set of seismic scenarios are selected. In the following, each frame that has been founded on the soft, medium and hard soil is analyzed for the case of fixed-base and the flexible-base assumption by incremental dynamic analysis (IDA). A comparison is made between the results of each frame in the flexible-base and fixed-base conditions. The results show that the consideration of the SFSI effects can significantly influence the IDA curves and decrease the structural capacity of frames. So that dynamic instability will occur before the expected capacity corresponding to fixed-base assumptions has been achieved. This instability increases with increasing shear wave velocity of soils and height of frames. For example, 3 and 6 storied frames with the flexible base, which have been founded on soft soil, reach ultimate capacity in 52% and 45% of spectral acceleration corresponding to fixed base, respectively.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 6
September 2021
Pages 2475-2496

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