Office in Sanno by Studio Velocity

Rich and open space created by large curved roof

Project Specs


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Appreciation towards Studio Velocity for providing the following description:


▼建筑外观,external view of the building ©Studio Velocity

The building is covered by a large curved roof, which created an interior one-room space with various heights and a rooftop space softly wrapped by the corrugated shape. Located in a mass residential area, the design ensures an open interior space as well as a relatively private roof space to meet different requirements of the office.

▼建筑拥有巨大的曲面屋顶,the building has a large curved roof ©Studio Velocity

▼从街道看建筑,一层空间开放,屋顶相对私密,view of the building from the street, first floor space is transparent while the roof space is relatively private ©Studio Velocity

制作曲面的方法一般有如下三种:1. 浇筑曲面的钢筋混凝土;2. 利用多角形的装饰材料拼接曲面;3. 使用弯曲的木材、铁质龙骨等制作曲面。第一种和第三种方法需要花费较高的成本;而第二种方法除了比较费事,还会给板材增加不必要的厚度。在这个项目里,设计师使用扁平截面的超薄平面材料,通过重力和拉力生成曲面。这是一种曲面制作的全新方法。

Generally, we have three methods to create curved surface. The first one is to use reinforced concrete. Or we could place multi-angled veneer together to make a curved finishing. Curved laminated wood, steel keel can also be used to build up the structure for a curved surface. However, it is very expensive to create curved surface by reinforced concrete or keels, and the other way is too troublesome, leaving with an unwilling thickened slab. In this project, architects choose super-thin flat materials to create curved surfaces through gravity and tension.

▼曲面屋顶,由平面材料制成,curved roof made of flat material ©Studio Velocity

▼人们在屋顶上的活动,activities on the roof ©Studio Velocity

▼四周抬起的屋顶为空间带来了一定的私密性,uplifted roof creates certain privacy for the rooftop space ©Studio Velocity


In order to eliminate the influence of the structure method, the architect used cypress instead of cables. Except for the extremely flatten beams and thin columns which seem not able to support the roof, the whole interior space is almost the same as other wooden structured buildings.

▼室内空间,使用木材制作扁平的梁和纤细的柱,interior space with flat beams and thin columns made of wood ©Studio Velocity


The architect use soft methods to define the interior space, including random vertical wooden materials, furniture arrangement and integration of spaces.

▼一层平面布置图,layout plan of the first floor ©Studio Velocity

▼室内空间未设置硬性隔断,there are no solid partitions in the interior space ©Studio Velocity

▼入口工作区,work space at the entrance ©Studio Velocity

▼利用家具布置划分区域,define the space by furniture arrangement ©Studio Velocity

▼玻璃采光井为室内带来自然光,glass light wells bring in natural light ©Studio Velocity

▼二层房间,room on the second floor ©Studio Velocity


When people get on to the roof, the stress on the tensioned vertical structure below would reduce, which allows the roof to bear about 400 kilogram per square meter. The stress in the tensioned structure counteracts the load on the roof, which could avoid changes in the shape of the roof.

▼结构图解,结构拉力与活荷载平衡以保持屋顶形状,structural diagram, balance between the tension and the live load, keeping the roof in one shape ©Studio Velocity



▼结构图解,计算不同材料的强度组合成精确的板材,structural diagram, create accurate wooden components by calculating the strength of each material ©Studio Velocity

The MOE of wood is the average value calculated by breaking large amount of wooden materials of the same kind. In the factories, this value is roughly categorized by experiments with different levels of strength. However, as wood is from trees and trees are different from each other, the MOE could vary even the materials are from the same kind of tree. Unlike concrete and steel, it is impossible to calculate the stress of wood precisely. Thus the safety rate of wooden material is very high and this kind of thinking is widely accepted by laminated wood factories.

If we use nondestructive test on the required wooden materials, we could get precise strength value of the material, which allows us to calculate the structure and design accordingly. In this project, the architect tested the strength of about 1100 laminated boards and finally decided the ratio of different materials, ending up in creating 12 accurate wooden materials.

▼一层平面图,first floor plan ©Studio Velocity

▼屋顶平面图,second roof plan ©Studio Velocity

▼剖面图,section ©Studio Velocity

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