{"id":19876,"date":"2025-12-27T13:27:24","date_gmt":"2025-12-27T12:27:24","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19876"},"modified":"2025-12-27T13:27:24","modified_gmt":"2025-12-27T12:27:24","slug":"steel-beam","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/steel-beam","title":{"rendered":"Steel beam"},"content":{"rendered":"
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Steel beams are among the central structural elements in building construction, structural engineering, and infrastructure projects. They carry loads across large spans, form frames, columns, or girders, and are used in composite constructions with concrete. In existing structures they are encountered during alterations, partial deconstruction, in industrial facilities, bridges, and tunnels. For planning, execution, maintenance, and especially for orderly deconstruction, it is crucial to understand geometry, material behavior, and connection details\u2014as well as the practical<\/em> methods used to safely separate, segment, and transport steel beams. Tools and attachments from Darda GmbH such as concrete crushers or rock and concrete splitters<\/a> play a role when beams are exposed from surrounding concrete or components are separated with low loads.<\/p>\n

Definition: What is meant by a steel beam<\/h2>\n

A steel beam is a bar-shaped structural member made of structural steel that primarily resists bending and shear. Typical profile shapes are I and H sections (double\u2011T beams), IPE\/HEA\/HEB, U-sections, T-sections, as well as welded box and composite cross-sections. Steel beams form floor and roof beams, frame girders, purlins, beam bridges, or bracing elements. In composite construction they work together with cast-in-place or precast concrete; shear connectors then transfer forces between the steel flange and the concrete slab. Properties such as yield strength, toughness, weldability, and corrosion resistance shape applicability in new construction, strengthening, and deconstruction.<\/p>\n

Construction, cross-sections, and materials<\/h2>\n

Steel beams consist of top flange, web, and bottom flange. The web carries shear, the flanges carry bending. Hot-rolled sections are widespread; for large capacities, welded plate or box girders are used. Common structural steels cover a wide range of strengths; the choice depends on deformation requirements, temperature exposure, and welding concepts. Surfaces are often galvanized, coated, or fire-protected. Cross-sectional geometry<\/strong> and slenderness influence buckling and lateral-torsional buckling susceptibility as well as the options for separative deconstruction.<\/p>\n

Profile series and typical dimensions<\/h3>\n

I and H sections (e.g., IPE, HEA, HEB) offer favorable material distribution for bending. U- and T-sections are often used as edge or bracing elements. Hollow sections (RHS\/SHS\/CHS) are torsionally stiff, but in deconstruction, due to closed cross-sections, they are particular candidates for cold-cutting tools. In composite floors, double\u2011T beams are coupled with concrete slabs; the shear interlock makes exposing them more difficult during partial deconstruction.<\/p>\n

Steel beams in composite with concrete<\/h3>\n

Composite beams use headed stud anchors or welded sections for force transfer. For deconstruction, the concrete topping is removed in sections to expose the connectors. Here, concrete crushers<\/em> provide valuable service: they crush the concrete locally without thermally affecting the steel cross-section. Where massive components must be separated with low loads, stone and concrete splitters<\/em> can create controlled crack patterns and release components with minimal residual stresses.<\/p>\n

Loads, stability, and design at a glance<\/h2>\n

Steel beams are subjected to bending, shear, and torsion. Stability phenomena such as buckling, lateral-torsional buckling, and local buckling limit the load-bearing capacity of slender segments. Serviceability is governed by deflection, vibrations, and sound transmission. This has consequences for deconstruction: temporary shoring, temporary bracing, and segmentation into manageable, craneable sections minimize deformations and protect adjacent components.<\/p>\n

Dynamics and vibrations<\/h3>\n

Dynamic effects from cutting operations, handling, or falling parts are to be avoided. Mechanical cutting or splitting produces lower thermal and dynamic effects than oxy-fuel cutting. In sensitive areas, hydraulic tools are therefore often used.<\/p>\n

Connections, fasteners, and erection<\/h2>\n

Steel beams are connected via end plates, cleats, web plates, welds, and high-strength bolts. Knowledge of these details determines the approach during deconstruction: bolts can often be cut or undone, welds must be separated. In composite floors, additional connectors must be considered. A careful construction-stage analysis clarifying the load path is the basis for any measure.<\/p>\n

Separation and cutting techniques in existing structures<\/h3>\n

Depending on the environment, fire load, and spark risk, different procedures are used:<\/p>\n