No. 59 April 2020 STEEL CONSTRUCTION TODAY & TOMORROW http://www.jisf.or.jp/en/activity/sctt/index.html
Special Issue Japanese Society of Steel Construction
JSSC Commendations for Outstanding Achievements in 2019 • Outstanding Achievement Awards 1 Nihonbashi Urban Redevelopment Project 2 Nakanoshima Festival Tower West 3 Osaki Garden Tower
Photo: Kiyohiko Higashide
• Thesis Awards 4 Restraint Effect of Concrete Floor Slab on Lateral-Torsional Buckling Behavior of H-shaped Steel Beam 5 Estimation of Fracture Strength of Welded Joints with Weld Defects 6 Low-cycle Fatigue Evaluation for Welded Joint of Shear Panel Damper in Multiple Steel Columns
Feature Article: Pacific Structural Steel Conference 2019 7 12th PSSC Held in Tokyo 9 Keynote Lecture 10 Technical Session 11 Technical Tour 12 Corporate Exhibition
JSSC International Events
13 2019 China-Japan-Korea Tall Building Forum in Nara, Japan 14 2nd IABSE Young Engineers Colloquium
Special Article: Stainless Steel 16 268 Orchard Road 18 Kamihirai Flood Gate
JSSC International Committee Back cover: Chairman Message
Published Jointly by
The Japan Iron and Steel Federation
Japanese Society of Steel Construction JSSC Commendations for Outstanding Achievements in 2019-Outstanding Achievement Awards Nihonbashi Urban Redevelopment Project Prize winners: NIHON SEKKEI, INC. and Obayashi Corporation
Redevelopment of Zone A with the hat trusses, belt trusses and oil tion method” is a construction method in The Nihonbashi 2-chome Category-1 Ur- dampers, appropriately arranged on the which temporary trusses are construct- ban Redevelopment Project is a develop- mega frames, of which the columns from ed between the 1FL beams and the B1FL ment of a Special Redevelopment District the upper floor are bent outwards at the beams to form mega frames, and the ex- consisting of four zones, centered on the base of the upper structure. The seismic cavation is carried out while hanging the Nihonbashi Takashimaya Shopping Cen- performance of Zone A is 1.5 times that underground columns from the mega ter Main Building (one of the Important of general high-rise buildings. (Fig. 1) frames. (Fig. 3) Cultural Properties) and the Category-1 For the construction of the basement, The pedestrian bridge between Zone urban redevelopment project. the “Inverted Construction method” was A and Takashimaya was built with a can- Zone A is located on the east side of adopted. The number of king posts was tilever structure supported from Zone A. Takashimaya, and its above-ground floors reduced as the columns along the perim- In order to avoid the effect of inter-lay- comprise offices and retails as well as ma- eter of the building were bent outwards er deformation at an event of an earth- chine rooms including the certified DHC to connect to the retaining wall. The re- quake, the L-shaped frame was planned for the entire zones. Its basement floors duced number of king posts as well as with a mechanism to restrain its vertical comprise parking lots and machine rooms adopting the “Mega Frame Inverted deformation by using liner sliders con- such as heat storage tanks. (See Photo 1) Construction method” greatly improved trolling the vibration induced at the end the workability of underground work of the bridge. (Fig. 4) ■ Design and Construction of Zone A and shortened the construction period by Zone A structure involves the multi-lay- about 6 months. (Fig. 2) ered buckling-restrained braces along The “Mega Frame Inverted Construc- ig Underground Structure ig 1 A ove-ground Structure one A at truss