Lunping Cultural Park boasts a green belt with diversified forestscape. Grounded on the principle of sustainable development and circular economy, the concept is that of a fallen leaf from the forest returning to the ground as it gently descends on a corner in the Park. Wood, a sustainable material, is the dominant material used throughout the project including in the structural system. Advanced laminated wood technology is applied to represent the novel open-style canopy, where the user is treated to a sensory experience of the air, sunlight and rain in the open public space. The structure, complemented by the surrounding forest, forms the entry gesture to the Park.
The primary structure combines wood and steel components. Lateral resistance is predominantly provided by the central arch in the short axis and the backbone in the long one, while vertical overlapping of the longitudinal bars provide synergetic forces in the vertical direction.
Loading force design
The design code for wood structures is followed, maximum requirements from the combination of seismic forces and wind loads in various directions are considered, and local reinforcement is added according to load distribution from the structural analysis in order to achieve economics in design.
Wind resistance design
This project is categorized as an open structure, and according to the code requirements for wind resistance, worst-case scenarios must be calculated by considering the simultaneous combination of lateral, upward and downward wind pressure.
Roof design and distortion control
The roof is composed of plasticized wood and purlins made from common cryptomeria wood. To achieve precision for the special curvilinear structure and reduce negative impact from structural distortion (the front cantilever is approximately 7.6 m, and the central span is approximately 19 m), the main structural members are pre-cambered and constructed with gravity-free full support so as to ensure the final structural form matches the architect's requirement. In addition, purlins near the exterior cantilevered areas are specially reinforced to limit distortion.
The primary design is combined footing, with three combined footings bearing the forces from the structure above. In consideration of the outward pushing forces of the arch structure, a tie beam is added or the structural wall bearing the passive pressure from earth is increased to enhance the structural stability and effectively pass the forces down to the ground level.
Joint detail design
The primary structure above is connected to the footings using bolts. Concealed joints are used wherever possible for the wood structure and steel plates to ensure effective conversion in the steel structure, achieving maximum integrity and consistency in the appearance of the wood structure.