{"id":19869,"date":"2025-12-26T09:08:06","date_gmt":"2025-12-26T08:08:06","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19869"},"modified":"2025-12-26T09:08:06","modified_gmt":"2025-12-26T08:08:06","slug":"steel-framework","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/steel-framework","title":{"rendered":"Steel framework"},"content":{"rendered":"
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Steel frameworks are load-bearing, resource-efficient constructions made of bar-shaped elements that are used in many structures\u2014from bridges and halls to towers and temporary safety and auxiliary structures. Throughout the lifecycle of such load-bearing systems, planning, fabrication and assembly as well as maintenance, deconstruction and recycling play a central role. Especially during deconstruction there is a clear practical link to hydraulically powered tools: concrete pulverizers and stone and concrete splitters support the material-pure separation of composite constructions and facilitate the dismantling of adjacent components, while steel shears, combination shears, Multi Cutters and tank cutters enable the precise separation of sections, gusset plates and claddings. Compact hydraulic power units<\/a> supply the required energy, including for special operations in sensitive or confined areas.<\/p>\n

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

A steel framework is a bar structure made of steel whose load-bearing capacity is primarily secured by triangles. Top and bottom chords are connected by diagonals and verticals (posts) that transfer loads through pinned or quasi-pinned nodes. The result is efficient load transfer with low self-weight. Typical connections are bolted, riveted or welded; cross-sections range from angle, T and I-sections to closed hollow sections. Steel frameworks are used in roofs, bridges, cranes, headframes, stage structures, support systems in tunnel construction and for temporary shoring. In existing structures, composite situations often occur, for example when a framework is grouted with concrete or enclosed by masonry\u2014this shapes planning, repair and deconstruction.<\/p>\n

Structural principles and typical components of a steel framework<\/h2>\n

The structural behavior of a framework is based on the unambiguous geometry of triangles that channel normal forces into members. Compression<\/em> often dominates in the top chord, Tension<\/em> in the bottom chord; diagonals alternate depending on the load case. Nodes are detailed to minimize eccentric moments and to simplify fabrication and erection.<\/p>\n

Members and cross-sections<\/h3>\n

Common choices are hot-rolled angle and I-sections, box and circular hollow sections for high torsional stiffness, as well as connection plates and gusset plates. The choice depends on span, actions, connections and corrosion protection.<\/p>\n

Connections and nodes<\/h3>\n

Historic frameworks are often riveted, more recent structures bolted or welded. During refurbishment and deconstruction this affects the approach: rivets are removed by cutting off heads and pressing out shanks, bolts are released or cut, welds are selectively severed. Precise cut guidance<\/strong> at nodes is crucial to avoid unintended load redistribution.<\/p>\n

Load-bearing behavior, stability and robustness<\/h2>\n

Steel frameworks transfer permanent and variable loads, wind and thermal actions through a network of tension and compression members. Slender compression members require checks for local and global buckling; bracing stabilizes the spatial system. Redundancy improves robustness\u2014important for construction stages during dismantling, when load paths are temporarily altered.<\/p>\n

Construction methods, protection and typical applications<\/h2>\n

Frameworks are found in industrial halls, bridges, conveying structures, stage and trade-fair builds, silos and tanks, as well as for support in tunnel construction. Corrosion protection is provided by coatings or metallic overlays; during deconstruction this influences cut quality. In composite constructions with concrete or masonry, material-pure separation is essential for recycling\u2014this is where concrete pulverizers and stone and concrete splitters are used.<\/p>\n

Dismantling and deconstruction of steel frameworks: planning and approach<\/h2>\n

Deconstruction falls under concrete demolition and special demolition as well as building gutting and cutting. It requires a structurally coordinated sequence, low-emission methods and a separation strategy for steel and adjacent construction materials.<\/p>\n

Principles of deconstruction planning<\/h3>\n