Vibration Characteristics And Equivalent
Young’s Modulus Of The Northern Library And
The Main Tower, Bayon, Cambodia
Author(s)
T. Maeda, T. Yamamoto, Y. Wako & T. Hirai
Abstract
We have studied vibration characteristics of the main tower and the sub-towers
in the Bayon temple since 2003 and have found that the continuum equivalent
Young’s modulus for these tower-like dry-masonry structures is 1/10 to 1/20 of
the typical value for the constituent rock blocks. In 2006, we measured microtremors
at the Northern Library and the Southern Library in the Bayon temple.
They are relatively small structures compared to the towers. Unlike those towers,
they look like frame structures composed of columns, beams, and walls made of
sandstone. Simulating their predominant frequencies by FEM, we found that the
equivalent Young’s modulus was similar to that for the towers and thus
concluded that the reduced modulus 1/10 to 1/20 uniformly holds for the
different types of dry-masonry structures in the Bayon temple. The Northern
Library had been completely restored by 2004 and the Southern Library was to
be restored. These libraries have similar predominant frequencies and there must
not have been large influence of restoration on the vibration characteristics. The
FEM model for the main tower in 2003 was based on photos and figures with
speculation of the interior of the tower. In 2006 we had a chance to refer to the
three-dimensional topographic data of the exterior and interior of the main tower
obtained by laser type equipment. We refined the FEM model and simulated
predominant frequencies again to find that the reduced equivalent modulus is
still valid.
Keywords: Bayon temple, micro-tremor observation, vibration characteristics,
FEM modelling, simulation of elastic modulus.
Keywords
Bayon temple, micro-tremor observation, vibration characteristics,
FEM modelling, simulation of elastic modulus.
Related Book
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