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Estimation of Quantity of Cl-from Deicing Salts on Weathering Steel Used for Bridges
Masamichi Takebe,Makoto Ohya,Shota Ajiki,Takashi Furukawa,Ryo Adachi,Rumiko Gan-ei,Naoki Kitagawa,Junya Ota,Yasuhiko Matsuzaki,Toshihiko Aso 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.2
To estimate the contribution of Cl from deicing salt (CaCl2) on weathering steel on a bridge in southwestern Japan, therelationship among the quanties of Cl, SO42 and Ca2+ on girders is examined. The composition of the ions on girder showsseasonal variation, and the Ca2+ and Cl on the western second girder are enriched with a ratio coresponding to CaCl2 in winter,suggesting that CaCl2 2 is more 50 % of totalchlorine ion and the corosion is more enhanced on the second girder.
Nonlinear behavior of R/C cooling tower shells
Hara, Takashi,Kato, Shiro,Ohya, Makoto Techno-Press 1997 Structural Engineering and Mechanics, An Int'l Jou Vol.5 No.5
In this paper the ultimate strength of the R/C cooling towers, which have initial imperfection and pre-cracked elements, is analyzed. The initial geometric imperfections arise from the unavoidable inaccuracies under the construction and the pre-cracks are assumed to be produced by the temperature stress gradients or cyclic loading under wind pressure and/or earthquake load. Both effects are strongly influenced on the strength of the R/C cooling tower shell structures. The reinforcing ratio is also the important factor to evaluate the ultimate strength of the R/C cooling tower shells. However we could not analyze these structures experimentally because of their large, analyses are the powerful schemes to evaluate the safety and reliability of these structures. The analyzed model is Port Gibson cooling tower shell. In the numerical analysis the geometric and material nonlinearities are taken into account.