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 4F ig 1 Aove-ground Structure one A 3F at truss ultilayered 2 uclinrestrained races GL 1F il dampers B1F 2 uclin restrained B3F races elt truss 0 B4F in post B5F Photo 1 Full view Seismic resistant ea rame etainin wall deice oundation asement ig 3 Mega rame wall steel eam etainin wall illin Column Temp races also as cut&demolis ig edestrian Bridge in post Important temp cultural property Liner sliders steel eam Beam remain 6F Temp race steel eam anin columns 5F temp steel eam Temp races ~15m Exp. joint L-shaped cantilever 1 Steel Construction Today & Tomorrow April 2020 JSSC Commendations for Outstanding Achievements in 2019-Outstanding Achievement Awards Nakanoshima Festival Tower West Prize winners: Nikken Sekkei Ltd. and Takenaka Corporation In Osaka, a twin tower project was pro- the large exterior wall of the low-rise sec- Adoption of Eco-friendly and Ad- moted at the site sandwiching Yotsubashi- tion (first to fourth floors) of the building, vanced Steel-structure Technologies suji street, one of the major trunk roads which were covered with bricks. In ad- In the Nakanoshima Festival Tower in Osaka, and the Nakanoshima Festival dition, between the top of the self-stand- West, diverse eco-friendly technologies Tower West is a high-rise building con- ing wall from the first floor to the fourth- have been applied, such as a regional air- structed as the second-phase project of floor underfloor and the fourth-floor large conditioning system (for the two build- this twin tower project. (See Photo 1) beam on the building’s east side, “BigWall ings in the twin tower project) using wa- The structural plan of the building con- framing” was structured in which 4 units ter from the rivers running on both sides structed as the first-phase project featured a of identical oil dampers were arranged. of the project site and a double-wall glass seismically-isolated intermediate layer and In this way, high-damping oil dampers “active skin” exterior wall attached to a giant truss structure. For the Nakanoshi- whose high damping effects have already the columnar-state section of the office- ma Festival Tower West, seismic resistance been confirmed were intensively arranged floor exterior wall surface. similar to that of the first-phase project was in the low-rise exterior brick-wall section In addition, because a heavy-traffic required to be provided by the project own- on the four sides. (Refer to Fig. 1) expressway runs in the site and the site er. To meet such a requirement, a “low-rise The adoption of the low-rise floor-in- is next to a trunk road, special cares were floor-intensive response-control structure” tensive response-control structure has required to pay to falling objects during was adopted for the Nakanoshima Festi- brought about two notable merits: secure- construction. To cope with such site con- val Tower West as a structural plan that se- ment of seismic resistance similar to that ditions, automated lifting-type external cures seismic resistance similar to that of of seismically-isolated structure obtained scaffolding, among others, was adopted the seismically-isolated intermediate layer. by arranging high-damping dampers in- to improve safety and productivity. Thus, tensively at the low-rise floors routine- the Nakanoshima Festival Tower West is Low-rise Floor-intensive ly applied; and no need for providing the assessed as a project that has greatly con- Response-control Structure floors without building application pur- tributed towards the improvement of the A total of 48 units of 6,000-kN high- poses like the seismically-isolated floors. construction technologies for high-rise damping oil dampers were arranged for steel-structure buildings. ￭ oto iyoio iaside iaside Sasin imuso Fig. 1 Framing Elevation and Damper Arrangement Hotel floors: Outer peripheral column @4.5 m 32nd-floor truss Pitch change of outer peripheral column+ Supression of flexural deformation Office floors: Outer peripheral column @3.6 m Center core 2,000-kN oil damper (208 units) Fifth-floor truss Pitch change of outer peripheral column+ Supression of bending deformation 6,000-kN oil damper at “BigWall” framing 1st~4th floors Intensive response-control layers 6,000-kN oil damper oto ull iew and lowrise section April 2020 Steel Construction Today & Tomorrow 2 -Outstanding Achievement Awards Osaki Garden Tower Prize winners: Yuichi Koitabashi, Seiya Kimura, Kenichi Hirai, Yoshihide Takada, Toshihiro Hayasaka, and TAISEI CORPORATION Osaki Garden Tower is an office build- By arranging the EVs face-to-face structure above ground. Therefore the ing of the Urban Redevelopment Proj- within 10.8 m, it was possible to arrange bottom-up construction method was ad- ect by Sumitomo Realty & Development the seismic resistant elements within the opted below ground, using SMW and Co., Ltd., which is 114-meter-high, and core on each of the grid lines with the earth anchors for the earth retaining the floor area is 178,000m2 consisting of EVs back-to-back. work, so that construction of the earth- +24 floors and -2 floors (Photo 1). By forming a rational seismic resis- works and main frame could be carried tant structure concentrated in the core out in an open state, 180,000 m³ of soil Outline of the Building taking into consideration the office flow was excavated, and the 50,000 m³ under- In the design of the external appearance, lines, in addition to adopting a seismical- ground structure was constructed in ten the building was divided in order to re- ly isolated structure, large office floors months. duce any oppressive feeling in the sur- were achieved with a high degree of free- The structural steel erection was car- rounding residential area. Also, the col- dom of planning arrangement, while en- ried out using four tower cranes and or of the glass was coordinated to show a suring high seismic performance. work proceeded with about 3,000 tons uniform external appearance. of structural steel in a cycle of two The standard floor provides open Construction Method for Under- weeks. ￭ space with outstanding views, with a me- ground Structure ga floor office of 5,500 m2 per floor, the The building has direct foundations, an largest in Tokyo, with long spans of 10.8 RC structure below ground, and a steel m, ceiling height 3 m, and depth of 21 m without columns.