The construction of precision facilities that must be protected against vibrations caused by main roads and railways has been in great demand. In order to satisfy the requirement of performance of these facilities, it is necessary to control the vibrations within the allowable limit being strict for precision instruments in buildings. This implies necessity for development of 3-dimensional dynamic soil-structure analysis that makes it possible to accurately predict the vibrations transmitting from sources to structures via soils, and to apply the most suitable measures for reduction of vibrations. Therefore, we have developed the analysis technique that combines 3-D FEM with thin layer method to predict the ground vibrations produced by traffics, machines and construction operations. Hence, 3-D FEM and thin layer models represent near-field including structures and far-field, respectively. The shaker test in the ground and the rapid load test were simulated, and the effectiveness of this analysys method was confirmed.
Keywords :Environmental ground vibration, Thin layer method, Finite element method,
3-dimensional predictive analysis, Dynamic problemsNorio TAGUCHI, Toshikazu HANAZATO, Yoshio IKEDA and Yoshiaki NAGATAKI 73 626 423-429 2008
Prior to construction of facilities which should not be exposed to intense environmental vibration, it is advisable to measure in-situ vibration and verify design merit to meet the environmental criteria. We have constructed simple response evaluation technique with soilstructure interaction incorporated. This technique comprises dynamic spring evaluated for simple soil layers identified by micro-tremor array observation and foundation input motion by spatial integration of measured accelerations. An application to the real site reveals similar results to that of FEM with energy transmitting boundary.
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