The laminar structures are proof that concrete structures can be efficient and elegant at the same time.
Throughout history, structural design has constantly sought to maximum efficiency of the materials used in construction. Along the way, major discoveries have emerged, such as reinforced concrete, lattice structures, and, of course, the laminar structures. This type of structural design has successfully harnessed curved geometries, based on the principles of geometric strength found in nature (such as an eggshell), to create lightweight and elegant structures widely used in contemporary architecture.
In this article, we will explore the unique characteristics of laminar structures, how they differ from other structures, and the challenges and considerations involved in their design and construction.
How did we come to develop laminar structures?
The history of structural design dates back to ancient civilizations, which developed various types of structures to meet their needs for weather-resistant shelter. Since then, the design and construction of structures have evolved significantly and have become increasingly sophisticated and advanced.
As technology and science advanced, engineers began to develop more robust theories of materials mechanics and the properties of the materials used in construction, as well as the geometry. This allowed for a a better understanding of load distribution and how to calculate the strength and stiffness of structures.
The introduction of materials such as steel and concrete In the 19th century, it also had a significant impact on structural design. With these materials, engineers were able to build larger and stronger structures, and they were also able to experiment with more innovative shapes.
Finally, the development of composite materials and the application of the theory of materials mechanics to composite structures has led to increased interest in laminate structures. These structures They offer a unique combination of strength and stiffness, making them ideal for many applications, from bridge construction to aircraft manufacturing.
A section of a laminated reinforced concrete structure designed by Félix Candela. Source: ArquitecturaViva
What are laminar structures?
Laminar structures are a type of structure characterized by the fact that their mechanical strength derives primarily from their geometric properties related to curvature and its ability to distribute loads across its surface. They are designed using various materials, such as wood, laminated metal, and composite materials like reinforced concrete, offering a unique combination of strength and rigidity, which makes them ideal for spanning large openings.
Laminated concrete structures are based on the principle of the material's resistance to bending and compression. Concrete is a material that is highly resistant to compression, but it is not as resistant to tension; therefore, Laminar structures are designed so that loads are distributed primarily as compression. and not in traction.
In the case of reinforced concrete, the following are used: forms double-curvature geometric shapes, which allows loads to be distributed in various directions, including compression, tension, and bending. However, the curvature of the surface makes the structure more efficient and stronger by allowing it to the loads are distributed more evenly, reducing stress points and stress concentrations.
In addition, the curved geometry of the double-curvature surfaces allows for the structures are lighter and more elegant, since they can be designed with thinner concrete sections and, therefore, require less material to build. This makes them particularly useful in architectural applications where the goal is to combine structural functionality with aesthetics.
Design of Laminated Concrete Structures
The shape plays a decisive role in the distribution of loads and the structure's ability to withstand them. Therefore, the first step in the design process is define the geometry of the surface, taking into account aesthetic and functional requirements, as well as the strength of the material used and the loads it must bear.
In the case of reinforced concrete, the selection of the the type of concrete and the reinforcing steel needed to provide strength to the structure. The concrete used must have high compressive strength to support vertical loads, as well as high tensile strength to resist the horizontal forces generated by the curvature of the surface. Steel reinforcement is necessary to provide the tensile strength required and ensure the structural integrity of the surface.
The next step in structural design is Determine the thickness of the concrete depending on the shape of the surface and the loads it must bear. On double-curved surfaces, the thickness of the concrete varies across the surface, with thicker in areas where the curves are more pronounced. This design allows loads to be distributed more evenly and minimizes surface stresses.
Finally, special attention should be paid to how the different structural components are joined together. In the case of double-curved concrete surfaces, Joints must be carefully designed to prevent stress concentrations and ensure the stability of the structure as a whole.
Tenerife Auditorium by Santiago Calatrava. National Geographic
Laminar structures demonstrate that the study of materials mechanics, combined with geometry, can result in elements that are both aesthetically interesting and highly efficient. If you’re interested in learning more about the different types of structural design, we recommend checking out the program for the Master's Degree in Structural Analysis, where you'll be assisted by highly qualified professionals with several years of experience in the industry.
