Effect of Change of Stiffness and Damping on the Strength Prediction of Reinforced Concrete Building Structures Using Microtremor Analysis  

Oleh:

Priyosulistyo, Henricus ; Jamal, Atika Ulfah ; Halisa ; Widowati, Aquilina Cory

Jenis: Article from Proceeding
Dalam koleksi: Proceeding The 1st International Conference on Sustainable Civil Engineering Structures and Construction Materials (SCESCM) di Yogyakarta, September 11 – 13, 2012, page 46-52.
Topik: microtremor; vibration; strength prediction; earthquake shake; building structures
Fulltext: 5.pdf (947.01KB)

Isi artikel

Many people are now more aware of the possible dangers of their buildings against medium to large Earthquake shake that may happen at any time. A strength prediction, by microtremor analysis, as proposed by Nakamura (2000) has not yet considered the effect of change of stiffness as well as damping on the prediction of maximum allowable acceleration of the building. The very low ground vibration (microtremor), due to very low earthquake shake, will induce a linear vibration of the building structure at its predominant frequencies. As long as the displacement relationship betweeen ground vibration and the building response is small their relationship can be briefly derived from the linear equation of motion. When a medium to large ground vibration applies on the building structure, the lateral resisting elements, such columns, will crack that decreases the stiffness but increases damping. The non-linear behavior of the stiffness and damping were blamed to be the cause of the non complience of the theory with the in situ condition of the structure. Theoretically the strength prediction as proposed by Nakamura (2000) shall overestimate the true maximum allowable acceleration if the stiffness of the structure behaves non linear weakening, but infact, the increase in damping will reduce lateral displacement response that underestimates the true maximum allowable acceleration. Parameters to accommodate the non linearity of the stiffness and damping are proposed by providing two sets of column with variable axial loads.

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