SIMOSE ART GARDEN VILLA・キールステックの家/Kielsteg House

2023年竣工 / 広島県大竹市 / 業務範囲:構造設計・工事監理
建築設計:坂茂建築設計 / 構造設計:KAP・村田龍馬設計所 / 写真:平井広行
Hiroshima, Japan 2023
Scope of work: Structural design and construction supervision
Architect: SHIGERU BAN ARCHITECTS / Structural design: KAP & Ryoma Murata Building Studio
Photography: Hiroyuki Hirai

Across a 4.6ha site of SIMOSE, facing the Seto Inland Sea, scatter the buildings of Simose Art Museum, 10 villas for accommodation, a restaurant, and a reception house. Among the waterfront villas, five Kielsteg Houses share a common structure and exterior, but each has a unique interior design. The architectural feature is a new lightweight timber structural material named Kielsteg, which is both a structural member and finishings of the roof and walls.

Kielsteg is a kind of a built-up beam that has upper and lower flanges made of spruce lumber and webs made of plywood or OSB. Each flange and web are joined by adhesive. Developed and manufactured in Austria, It has been used as structural material for roofs and floors in Europe for about 10 years, but this is the first usage in Japan. By pressing the upper and lower flanges with a half-width offset in the bonding process, the web naturally bends, creating a unique lattice shape. Panel thicknesses from 280mm to 800mm are available depending on span and load conditions.

キールステック部材断面図 Cross section of the Kielsteg element

In this house, Kielsteg elements of 280mm thick are used in three ways: on the roof (spanning 7.45m), on vertically standing walls, and on stacking wall, all of which are exposed inside as finishings. The stacking wall, which supports the load of roof as well as regulates the light introduced into the room, is made by stacking 10 layers of 200mm length blocks of Kielsteg. In collaboration with Hiroshima University, we conducted structural tests on the Kielsteg elements to verify their capacity against compression and ability of shear deformation occurred by earthquakes.

View of the Seto Inland Sea beyond the wide opening of the terrasse side
Ceiling and walls are finished with the flanges of Kielsteg element
Facade of the opposite side of the terrasse


実験協力:広島大学大学院 先進理工系科学研究科 森拓郎研究室



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