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Tokunaga M.,Structural Mechanics Laboratory | Sogabe M.,Structural Mechanics Laboratory | Uehan F.,Structural Mechanics Laboratory | Tanimura H.,Concrete Structures Laboratory | And 2 more authors.
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2012

The object of this paper is to propose a method to estimate the equivalent natural period with micro-tremor measurements on the basis of the correlation between the natural frequency and the yield frequency. A method, combining the Eigensystem Realization Algorithm and some empirical hypotheses of vibration modes, was proposed for identifying the first natural vibration modes of structures. A ratio of the yield frequency to the natural frequency was mostly a certain constant value and the average value of the ratio depends on the type of structures. This paper proposes a simple procedure for estimating the yield frequency with micro-tremor measurements.

Nakata Y.,Concrete Structures Laboratory | Watanabe K.,Concrete Structures Laboratory | Tadokoro T.,Concrete Structures Laboratory | Okamoto M.,Concrete Structures Laboratory | Ikeda M.,Steel and Hybrid Structures Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014

A number of calculation equations for the design shear capacity of steel reinforced concrete (SRC) members with simple support are given in the Design Standards for Railway Structures and Commentary (Steel-Concrete Hybrid Structures). However, there are some equations that are applicable to a certain member because the scope of application for these equations is unclear. In addition, support conditions for transverse beams on railway viaducts are different from simple supports because both transverse beam ends are fixed. In this study, the scope of application for existing equations was clarified, and an equation to calculate the shear capacity of SRC beams under antisymmetric moment distribution was proposed.

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