What is uhpc
Uhpc (ultra-highperformanceconcrete) was first investigated by professor bache in denmark in the 1970s with a large dose of steel fibres and the retention of normal reinforcement. From the 1990s, the french company bouygues, under the leadership of pierrerichard, began research into rpc, which was then optimised in collaboration with the lafarge r&d centre and commercialised in the late 1990s.
Uhpc is a cementitious concrete material with superb mechanical properties, high toughness, high durability, and excellent placing and forming properties. Fiberreinforcedconcrete).
The high performance of uhpc makes it more economical than other concrete materials for structural and decorative applications, and reduces the weight of buildings and components, thus reducing co2 emissions. The excellent durability reduces maintenance and repair of buildings and components, resulting in greener and more energy-efficient buildings and components throughout their life cycle.
Application classification of uhpc structures and components
Structural uhpc is a uhpc structure or component that bears loads other than self-weight, wind loads and seismic forces.
Decorative uhpc is a uhpc structure or member that does not carry loads other than self-weight, wind and seismic forces and has high requirements for decorative features including apparent quality, colour and homogeneity, typical applications are uhpc curtain wall panels, uhpc sunshades, uhpc decorative landscape elements, etc.
In some cases, uhpc structures or elements need to bear structural loads and achieve high architectural decoration effects at the same time, which require high mechanical performance, detailed structural force analysis and calculation, structural safety and feasibility, as well as full integration and mutual adaptation of architectural design and structural design. There are high demands on the moulding, casting and maintenance processes to ensure that the decorative effects of the building are met. This type of application can be called uhpc decorative and structural integration.
The value of integrated decorative and structural uhpc applications
Scenarios and key success factors
The main application scenarios for the integration of uhpc structure and decoration are thin and lightweight structures or elements with high requirements for building form and apparent quality, which at this stage include bridges, roofs, balconies and staircases.
The key to the implementation of the integration of uhpc structure and decoration lies in the full discussion and communication between the owner, the architect, the structural engineer, the prefabricated component factory, the installer and the uhpc material supplier, repeatedly refining and gradually improving the scheme, which can meet the architect’s requirements for modelling and apparent quality, but also ensure structural safety, and at the same time effectively control the efficiency and cost of component production and installation.
Application of integrated decorative and structural uhpc
Challenges and prospects
As an emerging cementitious material, uhpc is gradually expanding its application in the field of structural engineering and curtain wall decoration, and the integrated application of structure and decoration is the full exploitation of its performance.
- Awareness and understanding of uhpc performance by owners, architects, and structural engineers.
- Uhpc structural calculation protocols.
- Awareness of the impact of uhpc on energy consumption and costs throughout the life cycle of the building.
- Studies on the impact of conservation methods on structurally and decoratively integrated elements.
- The effect of steel fibre pitting on the apparent effect.
With the knowledge and understanding of its performance by architects and structural engineers, the implementation of more project cases, the continuous learning of experience and the improvement of structural calculations, moulds and pouring and maintenance processes, the application of integrated structural and decorative uhpc will certainly have a good future.
Marseille, france, is recognised as a mecca where some of the greatest designers in history have come to find inspiration.
Its façade is made up of a uphc (ultra high performance concrete) shading structure, and the uhpc standard wall panels are available in a wide range of colours and can be customised to the specific colour required.
Of course the characteristics of uhpc also bring unprecedented ease of construction, because not only is it possible to achieve a super thin perforation rate and weight. It can be used as a decorative skin, but also as a self-weighting structure on its own.
The outermost skin of the project is made of self-supporting uhpc elements in the form of openwork panels, with 3 different types of panels combined in an ever-changing form.
The pedestrian bridge linking fort st. Jean to the museum is made up of 25 prefabricated panels, each unit 4.6 m long and 4 cm thick, for a total length of 115 m (plus 135 m for the circuit). The construction error is between 0.3 mm and 0.4 mm.
A closer look reveals that the uhpc feature is what allows the skin façade of the building to achieve such a high perforation rate as well as even arbitrary patterns. This is difficult to achieve with conventional materials, be they wood, metal or other products.
And why, of course, thanks to its truly superb performance!