Basic Requirements

The client wishes to construct a bathroom on a circular base and has already defined certain functional zoning requirements. This results in a clear functional layout. Due to the circular nature of the space and the client’s desire for a design that feels both innovative and natural, the architectural form is influenced accordingly.

Design Concept

The design is inspired by the structure of the ammonite shell, adopting the spiral curves of the shell to shape the outer skin of the building. The main structure is a hemispherical dome, serving as the core framework. The structure will be built using a steel frame wrapped with small bamboo culms to reduce the time required for bending bamboo while also enhancing structural strength.

Key Structural Features

The design uses a three-point load-bearing system. The rafters and structural elements of the roof function as inclined columns, arching from two footings on the left and converging at a single footing on the right. These are supported by a cluster of bundled bamboo columns. This configuration allows for curved forms between the footings by using bundled small bamboo culms. The roof uses a two-layered grid system, in which paired bamboo elements overlap to form a woven-like pattern, contributing both aesthetic value and structural support. The bamboo roofing complements the organic form of the structure.

Structural Approaches Proposed

• Using a three-point footing system to support the structure

• Utilizing bundled small bamboo culms as both rafters and structural columns, with each rafter pre-bent to a unique curvature before installation

• Implementing a grid system for purlins and rafters

• Using bamboo cladding techniques such as split-bamboo ceiling panels (fa sab fak) and overlapping split-bamboo roofing (sab fak)