System Identification of RC Building Using N4SID

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International Journal of Research and Scientific Innovation (IJRSI) | Volume VI, Issue XI, November 2019 | ISSN 2321–2705

System Identification of RC Building Using N4SID

Sertaç TUHTA1, Furkan GÜNDAY2

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1,2Department of Civil Engineering, Ondokuz Mayis University, Turkey

Abstract—In recent years, surveys of earthquake and earthquake effects have an important place in civil engineering field.
Earth on structures have been severely damaged by the earthquake. Thus, there has been loss of life and property.
This has particularly affected countries located on active fault lines. For all these reasons, pre- and post-earthquake measures have been developed. Attention has been paid to taking earthquake effect into consideration in rebuilding structures.
However, there are no measures other than demolition or retrofit options for existing buildings.System identification methods have emerged in order to determine the earthquake performance of the buildings.In this paper, a new structural identification tool is proposed to identify the modal properties of structures.At last, after collecting modal responses from the available sensors, the mode shape vector for each of the decomposed modes in the system is identified from all obtained modal response data. System identification of RC building was performed. Matrices A, B, C, D, K were omitted. All these works have been done by using N4SID. N4SID stands for numerical algorithms for system identification. With the numerical algorithms found, the mathematical model of the system is extracted. The mathematical model of the system determines the performance of the system. Results demonstrated that N4SID system identification method is efficient in identifying modal data of the structures.

Keywords—System identification, N4SID, RC building, Earthquake performance, Numerical algorithms


Most of structures located in regions prone to earthquake hazards suffer from various types of destructioncaused by seismic loads. Under such earthquake occurring, the parts (especially the columns) of building structuressuffer damage. Looking on the other side, especially considering the performance of such buildings under seismicoccurrence, there is a great need to strengthen the columns even without changing their building masses; this clearlyshows that there is a need to investigate the connection between technical repairing or strengthening procedures andthe column capacity. In this understanding, more researches are being conducted to get required performance ofstructures under seismic loading, by means of looking at different point of view and directions [2], [12],[13],[14].