The “Moon-Viewing Bridge” in the Tainan district of Zhuxi uses the growth pattern of bamboo as its main design concept. The project continues a long tradition of wood construction in Taiwan’s ancient capital city of Tainan.
The Moon-Viewing Bridge has the form of a curved arch bridge. The material used is high-density laminated timber (CLT) made of Japanese Larch. The timber panels together with the upper and lower chord steel wires form the main structural system. The special design of the curved arch bridge and the space truss increase the strength of the bridge’s structural mechanics. Taiwan’s climate is very humid, thus it is very important to control the moisture content of the laminated timber, and also use anti-corrosion treatment. The moisture content of glulam can be controlled below 15%, and it is not prone to manufacturing errors or deformation and cracking. The “strength per unit weight” of laminated timber is greater than that of steel or concrete, making the overall weight lighter. The steel structure needs fireproof coating, but the laminated timber forms a carbonized layer on its surface in case of fire and has a natural fireproof effect. In terms of thermal deformation, high-density laminated timber is wood that has been glued after drying at a high temperature of 100 degrees or more. The thermal conductivity is 1/11 of that of concrete and 1/350 of steel. Therefore, high-density laminated timber is much less prone to temperature changes than steel or concrete.