Practical Evaluation Method of Input Loss of Rigid-Frame Viaducts With Piles

Abstract eng:
Past studies have shown that the input loss effect associated with the dynamic interaction of groundfoundation systems can be reproduced in large-scale group-pile foundations. However, only few studies have investigated the input loss effect on structures such as the single-column, one-pile rigid-frame viaducts commonly observed in Japan which are not expected to provide the group-pile effect due to a longer distance between the piles than the normal one.Therefore, we examined the input loss effect of rigid-frame viaducts. In addition, we proposed a simplified static analysis method for evaluating the response of structures while taking into consideration the input loss effect, and examined the applicability of the method proposed. The scope of the research and the results are summarized below. (1) A dynamic linear analysis by means of two-dimensional lumped-mass models was conducted to examine the input loss effect of one-column, one-pile rigid-frame viaducts. It was found out that rigid-frame viaducts that have wide inter-pile spacing and therefore are not expected to provide the group-pile effect can still produce input loss, and the input loss effect becomes greater as the difference in rigidity between the ground and the piles becomes larger. (2) Reduction of structural response associated with input loss is significant at low frequencies. (3) In order to take the input loss effect into consideration in the structural response evaluation, methods were proposed for calculating effective input coefficients by means of a seismic deformation method and for calculating response spectra based on the random vibration theory. The applicability of these methods proposed was verified through comparison with dynamic analysis.

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