Steel and Hybrid Structures Laboratory

Laboratory, Japan

Steel and Hybrid Structures Laboratory

Laboratory, Japan
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Ikeda M.,Steel and Hybrid Structures Laboratory | Saito M.,Steel and Hybrid Structures Laboratory | Aoki C.,East Japan Railway Company Formerly Steel and Hybrid Structures Laboratory | Bandai Y.,West Japan Railway Company Formerly Steel and Hybrid Structures Laboratory | Yoshida N.,Steel and Hybrid Structures Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014

Concrete filled steel tube (CFT) members have been applied to the columns of rigid frame structures. However the failure mode, the bending capacity and deformation performance of CFT members with small shear-span ratio are not clear because there have been few studies on them. In this study, cyclic loading tests were conducted on short-column CFT members with constant vertical loads. As a result, it was confirmed that they show a flexural failure mode, but the existing design method overestimates their bending capacity. Therefore, a new evaluation method was proposed for their bending capacity and deformation performance.


Nihei T.,Steel and Hybrid Structures Laboratory | Kito N.,Concrete Structures Laboratory | Kito N.,Central Japan Railway Company | Okamoto M.,Concrete Structures Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2016

A new retrofit method was developed, geared mainly for cantilever rigid-frame viaducts, which involves the installation of RC beams in each of the viaduct's columns to improve cantilever performance against strong wind loads, generated by noise prevention barriers which are higher than before. This paper describes the experiments and FEM analyses conducted to evaluate the effectiveness of this method. Firstly, confirmation was obtained that this method can be used on cantilever viaducts to increase resistance. Secondly verifications were made to ensure that that this method allows cantilevers to support barriers of about 5 m. Finally, a method was proposed which can be used to calculated the allowable bending strength using this method.


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.


Sugimoto I.,Steel and Hybrid Structures Laboratory | Kita K.,Steel and Hybrid Structures Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2010

The design standard for railway steel structures and composite girders was recently revised, and its range of applicability was extended to recently developed steel materials including Ni-advanced weathering steels and Bridge High-performance Steels (BHS). Ni-advanced weathering steels can be applied without painting to bridges in corrosive environments, while BHS materials feature high strength and enhanced weldability. This paper explains the method of evaluation for the applicability of Ni-advanced weathering steels from the results of exposure tests, and outlines the advantages of BHS application to railway bridges from the results of trial design.


Kobayashi Y.,Steel and Hybrid Structures Laboratory | Fukumoto M.,Steel and Hybrid Structures Laboratory | Nishikawa Y.,Steel and Hybrid Structures Laboratory | Kataoka H.,Track Structures and Components Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014

The new installation of Continuous Welded Rail (CWR) on existing steel bridges is often restricted because of their limited steel bearing capacity of longitudinal axial forces exerted by CWR loads. On the other hand, the capacity is mainly based on design calculation which has not been verified actually. In this research, the actual behavior and performance of CWR load and the bearing capacity were evaluated by field measurements and laboratory experiments with a view to promoting CWR installation on existing steel bridges.


Sugimoto I.,Steel and Hybrid Structures Laboratory | Ikeda M.,Steel and Hybrid Structures Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2010

The new Design Standards for Railway Structures (Steel and Composite Structures) -a revised edition of the last version published in 1992 - now wholly incorporates the performance-based design method. The standard now includes new structural analysis methods, accuracy improvement for verification methods, and other pertinent techniques. This review gives an outline of the new design standard.

Loading Steel and Hybrid Structures Laboratory collaborators
Loading Steel and Hybrid Structures Laboratory collaborators