Seismic Responses of Concrete Building Subjected to Out-of-phase Ground Motions


  • Yohanes Karyanto Petra Christian University
  • Dario Rosidi Jacobs Engineering Group, Oakland, California
  • Pamuda Pudjisuryadi Petra Christian University



local soil effects, out-of-phase ground motions, interstory drift ratio, base shear, tie beam


Seismic performance of a building is commonly evaluated by applying same design ground motions at each building foundation. However, local soil conditions beneath a building likely vary, and these variations could result in out-of-phased design ground motions at each of the foundation locations. In this study, building’s responses during earthquakes were analyzed and compared using same and out-of-phase ground motions. The building is 10-story, 90m-wide, reinforced concrete structure supported on isolated footings with tie beams. Dynamic time response analyses were performed using five earthquake records which were scaled to a design response spectrum for a location in Surabaya. Seismic modification factor, R, of 8 was used. The results indicate that the use of out-of-phase ground motions does not have significant impacts on building inter-story drifts; it results, however in significantly higher column base shears and tie beam axial forces compared to those calculated using same ground motions.

Author Biography

Dario Rosidi, Jacobs Engineering Group, Oakland, California

Adjunct Lecturer, Department of Civil Engineering and Planning Petra Christian University, Surabaya, Indonesia and Sr. Principal Geotechnical Engineer, Jacobs Engineering Group, Oakland, California, USA


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How to Cite

Karyanto, Y., Rosidi, D., & Pudjisuryadi, P. (2023). Seismic Responses of Concrete Building Subjected to Out-of-phase Ground Motions. Civil Engineering Dimension, 25(2), 96-105.

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