Entity

Time filter

Source Type


Nakata Y.,Concrete Structure Laboratory | Tadokoro T.,Concrete Structure Laboratory | Okamoto M.,Concrete Structure Laboratory | Tanimura Y.,Planning Division
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2013

In the design of RC members, reinforcement arrangement methods are determined according to structural details of reinforcement, since the latter are preconditions for applying a specific design method. However when reinforcement arrangement methods are applied to members in small sections, it is difficult to validate the method adequately. This difficulty arises because the methods have been proposed for the members on comparatively large sections. Consequently, in this study loading experiments and analyses were performed on specimens for a number of different reinforcement arrangements. For example, various reinforcement diameters and spacing were investigated. The influence of structural details in the reinforcement arrangement method on deformation performance of RC members was clarified. Finally a reinforcement method was proposed based on mechanical theory considering the buckling of longitudinal bars. Source


Watanabe K.,Concrete Structure Laboratory | Tadokoro T.,Concrete Structure Laboratory | Tanimura Y.,Concrete Structure Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2011

The use of low-grade material sheath grouting for PC girders has resulted in some PC girders initially constructed in the 1950s having insufficiently filled sheaths. The exposure of PC tendons in the sheath generates corrosion and rupture of the PC tendons, reducing the load-bearing capacity of PC girders. This research focused on the interface bond between PC tendons and grout in the sheath through loading tests in order to explain the loading capacity of deteriorated PC girders. Source


Watanabe K.,Concrete Structure Laboratory | Kito N.,Concrete Structure Laboratory | Todoroki S.,Concrete Structure Laboratory | Ohno Y.,Concrete Structure Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2015

Fractures in cover concrete on reinforced concrete (RC) viaducts is caused by the expansion of reinforced-bar due to corrosion. In order to understand the mechanisms behind these fractures cross-sections of a corroded rebar were evaluated using the equipment proposed in this paper. In addition, a series of experiments and non-linear finite element analyses were conducted to evaluate the effect of rebar spacing and cover-concrete thickness on the shape of cover concrete fractures and extent of corrosion. Source

Discover hidden collaborations