Spannbetonträger

Spannbetonträger, often translated as prestressed concrete beams, are structural elements where internal compressive stresses are introduced before external loads are applied. This prestressing is typically achieved through high-strength steel tendons that are tensioned and then anchored against the concrete. The purpose of this prestressing is to counteract the tensile stresses that would normally develop in a concrete beam under bending loads. By applying an initial compression, the concrete is placed in a state that is more resistant to cracking.

There are two primary methods for prestressing: pre-tensioning and post-tensioning. In pre-tensioning, the steel tendons are tensioned before the concrete is poured. Once the concrete has hardened, the tension is released, transferring the force to the concrete. In post-tensioning, ducts are cast into the concrete, and after the concrete has gained sufficient strength, tendons are threaded through these ducts, tensioned, and then anchored. The ducts are often grouted to bond the tendons to the concrete.

Spannbetonträger offer significant advantages over conventional reinforced concrete beams. Their ability to resist higher loads and span longer distances with less material is a key benefit. They also exhibit improved durability and reduced deflection. These characteristics make them highly suitable for a wide range of applications, including bridges, multi-story buildings, parking garages, and industrial structures. The design and construction of spannbetonträger require specialized knowledge and adherence to strict codes and standards to ensure their performance and safety.