Zenitaka Corporation

Tokyo, Japan

Zenitaka Corporation

Tokyo, Japan
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Ishikawa K.,University of Fukui | Matsushita C.,Zenitaka Corporation
Journal of Structural and Construction Engineering | Year: 2013

The study deals with EP roof type lattice shells with ceiling panels supported by truss arch frames on the both sides. The estimation method based on the elasto-plastic dynamic buckling analyses considering a geometric norilinearity is proposed to calculate practically the base-shear strength coefficient and the applied seismic lateral and vertical load distributions on the lattice shell and the truss arch frame. As far as the collapsed mechanism is concerned, the member buckling occurs in the both structural elements. The proposed method is practically useful to determine the collapse mechanism and calculate the ultimate lateral strength on the earthquake-proof design for the damage and safety limit earthquakes.


Akiyama H.,Zenitaka Corporation | Nakayama M.,Zenitaka Corporation | Kayanoki H.,Government of Nara Prefecture
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2011

The Yumekake Bridge is an extradosed prestre ssed concrete bridge over the Kumano River in a steep ravine located near the UNESCO World Heritage Site of Sacred Sites and Pilgrimage Routes in the Kii Mountain Range in Japan. This bridge is the nation's first extradosed prestressed concrete br idge with high-strength and self-compacting castin- place concrete having specified design strength of 60 MPa for the tower and the box girder. The high-strength materials are also employed for the piers. This solution ensured slenderness and seismic resistance. The special features of the bridge are reported in this paper.


Akiyama H.,Zenitaka Corporation | Tanaka I.,Central Nippon Expressway Company Ltd | Satoh K.,Central Nippon Expressway Company Ltd | Tsuji K.,Zenitaka Corporation
Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE) | Year: 2014

The Kaneda Viaduct was constructed as a part of Metropolitan Inter-City Expressway in Atsugi City, Kanagawa Prefecture, Japan. The viaduct comprises a couple of S-curved bridges with extremely large numbers of continuous spans. The Southbound Bridge is a 1019 m long 33-span continuous bridge. The Northbound Bridge is a 1042 m long 34-span continuous bridge. The Northbound Bridge has the largest number of continuous spans in Japan. The seismic design took into account the S-curved road alignment and dynamic behaviour of the bridge with seismic isolation bearings. Super-high-damping rubber bearings were adopted for all the piers to isolate seismic motions and to absorb seismic energy. Their shear deformations were adjusted after the completion of the structures using so-called post-sliding operations to minimise the size of the bearings.

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