Combined modal parameters-based index for damage identification in a beamlike structure: theoretical development and verification

• Autorzy: Fayyadh M. M. , Razak H. A. , Ismail Z.

Warianty tytułu

PL

Łączny parametr modalny jako indeks identyfikacji zniszczenia konstrukcji belkowych: podstawy teoretyczne i weryfikacja numeryczna

• Języki publikacji: EN

Abstrakty

EN

A new index for detecting the damage severity in structural elements by combining modal parameters is proposed in this study. The index is based on the combined effect of both the natural frequencies and mode shapes when a change in stiffness of the structural element occurs. In order to demonstrate the significance and capability of this new algorithm, the magnitude of damage was calculated from a finite element model of a beam-like structure model and comparisons with previous algorithms were carried out. The new index called Combined Parameter Index (CPI) compares the factor of reduction in stiffness according to reduction in natural frequencies and also the factor of reduction in stiffness according to change in mode shape. Various damage levels starting from reduction in stiffness of 1% were adopted to validate the sensitivity of the new index to detect the damage severity at various deterioration levels. Mid-span and quarter-span damage positions were adopted to verify the capability of the new damage index to detect the damage severity at various locations. Moreover, damage in support condition was investigated in order to ascertain that the new damage index can also identify support damage cases. The results indicate that the new index has better ability and higher sensitivity to determine the severity of the damage due to stiffness changes in the element or support. In addition, the CPI exhibits sensitivity to detect lower level of damage occurring at earlier stage by having the ability to detect a damage of 1% reduction in the structural element stiffness or elastic bearing stiffness.

PL

W pracy zaproponowano nowy indeks wykrywania stanu uszkodzenia w elementach konstrukcyjnych, który bazuje na łącznym wykorzystaniu parametrów modalnych. Indeks wykorzystuje efekt zmian częstości własnych i zmian kształtu formy własnej, które towarzyszą zmianie sztywności uszkodzonego elementu. Znaczenie i możliwości proponowanego podejścia porównano z innymi algorytmami wykrywania uszkodzeń wykorzystując w tym celu analizę konstrukcji belkowych metodą elementów skończonych. Nowy indeks (Combined Parametr Index (CPI)) porównuje efekt redukcji sztywności ze zmianą częstości i zmianą kształtu formy własnej. Testowano różne poziomy i usytuowania miejsc obniżenia sztywności modelujące stopień degradacji konstrukcji w celu kalibracji wrażliwości proponowanego indeksu zniszczenia. CPI testowano także na konstrukcjach z uszkodzonymi więziami podporowymi. Otrzymane wyniki wskazują, że proponowany indeks CPI wykazuje duże możliwości i wrażliwość - jest skuteczny już od poziomu 1% utraty sztywności - w wykrywaniu stanu uszkodzeń elementów i więzi podporowych konstrukcji.

Słowa kluczowe

EN

damage detection; frequency reduction index FRI; mode shape reduction index MSRI; modal assurance criteria MAC; combined parameter index CPI; elastic bearing stiffness

PL

wykrywanie uszkodzeń; elastyczna sztywność łożyska; konstrukcje belkowe

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2011
• Tom: Vol. 11, no 3
• Strony: 587--609
• Opis fizyczny: Bibliogr. 27 poz., tab., wykr.

Twórcy

autor

Fayyadh M. M.

autor

Razak H. A.

autor

Ismail Z.

• Dep. of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

Bibliografia

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