IDENTIFICATION OF PACOIMA DAM FROM 1994 NORTHRIDGE EARTHQUAKE RECORDS

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JALALI A.A.R.

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Paper Information

Journal: JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TABRIZ) Year:2009 | Volume:38 | Issue:3 (CIVIL ENGINEERING) Page(s): 37-42

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Title

IDENTIFICATION OF PACOIMA DAM FROM 1994 NORTHRIDGE EARTHQUAKE RECORDS

Author(s)

JALALI A.A.R. | Issue Writer Certificate

Keywords

ARCH DAMQ1

SEISMIC DATA PROCESSINGQ1

SYSTEM IDENTIFICATIONQ1

LINEAR FILTERING THEORYQ1

Abstract

Most if not all of the dams are located near or on the faults, and severe ground shaking from near-fault may cause significant damage to dams. Such damage usually is associated with changes in structural stiffness. Consequently, the actual performance of the dam can be predicted only by non-linear analysis. Moreover standard earthquake analyses of civil engineering structures use uniform ground motions even though considerable variations in both amplitude and phase can occur along the foundation interface for long-span bridges and large dams. The main purpose of this study is the identification of vibration properties, effect of interactions on these properties, and finally detection of nonlinearity in the dam-foundation rock-reservoir system by applying SYSTEM IDENTIFICATION methods on seismic response data from Pacoima Dam. For the identification of dam properties from seismic response data during 1994 Northridge earthquake, ARX models are applied using the time-invariant and time-variant or recursive approach to identify the dynamic characteristics of the dam-foundation rock-reservoir. The system modal damping, natural frequencies and frequency response functions are identified. The identified resonant frequencies and corresponding damping ratios have been compared with the results obtained from forced vibration measurements and analytical methods. All of the results are fairly in good agreement. It has also been shown that assumption of uniform input is not realistic and could lead to erroneous results. In addition time-varying modal parameters have been estimated. The method is useful for obtaining vibration properties of dam-foundation rock-reservoir system. These properties are essential in safety evaluation of existing dam structures.

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APA: Copy

JALALI, A.A.R.. (2009). IDENTIFICATION OF PACOIMA DAM FROM 1994 NORTHRIDGE EARTHQUAKE RECORDS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TABRIZ), 38(3 (CIVIL ENGINEERING)), 37-42. SID. https://sid.ir/paper/43811/en

Vancouver: Copy

JALALI A.A.R.. IDENTIFICATION OF PACOIMA DAM FROM 1994 NORTHRIDGE EARTHQUAKE RECORDS. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TABRIZ)[Internet]. 2009;38(3 (CIVIL ENGINEERING)):37-42. Available from: https://sid.ir/paper/43811/en

IEEE: Copy

A.A.R. JALALI, “IDENTIFICATION OF PACOIMA DAM FROM 1994 NORTHRIDGE EARTHQUAKE RECORDS,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TABRIZ), vol. 38, no. 3 (CIVIL ENGINEERING), pp. 37–42, 2009, [Online]. Available: https://sid.ir/paper/43811/en

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