{"id":19889,"date":"2025-12-30T11:49:48","date_gmt":"2025-12-30T10:49:48","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=19889"},"modified":"2025-12-30T11:49:48","modified_gmt":"2025-12-30T10:49:48","slug":"web-plate","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/web-plate","title":{"rendered":"Web plate"},"content":{"rendered":"
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The web plate<\/strong> is a central component in steel and composite construction. As a vertical or inclined plate, it connects the flanges of a beam, transfers shear force<\/em>, and stabilizes the overall geometry. In practice, it appears in hall girders, bridges, crane runway girders, box girders, composite beams with a concrete slab<\/strong>, as well as a stiffener in tanks and shafts. For concrete demolition and special deconstruction<\/a><\/em>, understanding the configuration and load-bearing behavior of the web plate is important in order to cut selectively, expose, or safely neutralize load paths\u2014for example, during the selective deconstruction of composite cross-sections, in which concrete zones are carefully removed using a concrete pulverizer<\/strong> and stone splitter and concrete splitter<\/strong>.<\/p>\n

Definition: What is meant by web plate<\/h2>\n

The web plate (also: web, web plate) is generally the thinner plate component of a beam that connects the flange plates (top flange, bottom flange). The web plate predominantly carries shear force<\/em>, helps limit eccentricity, and stabilizes the flanges against buckling. In welded plate girders and box girders, the web plate is cut from rolled plate and welded to the flanges. In composite structures, the web plate works together with concrete components (e.g., cast-in-place concrete<\/strong> concrete slab<\/strong>) via shear connectors, and it also plays a role as a separation plane during deconstruction.<\/p>\n

Design variants and typical geometries of web plates<\/h2>\n

Web plates occur as a single web in an I-girder, as a double web in box girders, or as stiffening plates in tanks and shafts. Key parameters are web thickness tw<\/sub>, web height hw<\/sub>, web openings (penetrations), beads, and edge radii. The geometry influences buckling resistance, shear capacity, and processability during deconstruction.<\/p>\n

Configuration, terminology, and structural action<\/h2>\n

The structural behavior of a beam is significantly determined by the web plate. While flanges primarily resist bending moments, the web transfers the shear force. At high shear stresses, web buckling can occur; stiffening angles or plates then increase stability. Web openings facilitate installations but must be reinforced all around. In composite beams, the web plate transfers shear forces between steel and concrete; during deconstruction these composite zones must be deliberately released.<\/p>\n

Materials, standards, and quality<\/h2>\n

Unalloyed or low-alloy structural steels (e.g., S235, S355) according to applicable European standards are common. Execution follows recognized rules of practice for steel construction and composite construction. In service, corrosion, fatigue due to cyclic loading, and local effects (e.g., crane impacts) act on the web plate. Clean weld seams, correct edge finishing, and adequate corrosion protection are decisive for durability.<\/p>\n

Fabrication and joining techniques<\/h2>\n

Web plates are cut from plate sheets (thermal or mechanical), aligned, and welded to flanges. Stiffeners are welded on or bolted. Minimum spacings and edge radii apply to web openings to avoid stress concentrations. For subsequent work in existing structures, low-emission and low-vibration methods are advantageous. In deconstruction, concrete zones around composite areas can be released with a concrete pulverizer<\/strong> and separated with stone splitter and concrete splitter<\/strong> with low stress before the web plate is separated as a steel component.<\/p>\n

Typical fields of application of web plates<\/h2>\n

Web plates are found in:<\/p>\n