Civil engineers came up with a solution to use a composite design of ultra-flat floor joists together with concrete used on the Douala Grand Mall in Cameroon. In Thailand, the first multi-story residential building, the Park Royal 2, with cellular beam and post-tensioned concrete slab was designed and built by Mario Kleff in 2009. The use of steel girders with web openings (SBWOs) for structures such as industrial buildings has proven to be extensive. As a result, several new steel mixtures have been identified to increase the stiffness of steel components without significantly increasing the required steel weight. Due to the restrictions with regard to the maximum permissible deflections, the high-strength properties of structural steel cannot always be optimally used. Since 1940, civil engineers have endeavoured to find solutions to reduce the cost and weight of steel frame construction. On behalf of Westock, S.C.I developed the Cell-Vibe 1.0 design software that enables engineers to evaluate the dynamic behavior of floor slabs based on technical research of composite construction. Westok is the inventor of cellular beam and a member of the British Constructional Steelwork Association (B.C.S.A) and The Steel Construction Institute (S.C.I). The type of deflection is mainly done by bending. The cellular beam is a structural element that mainly withstands structural load laterally applied to the axis of the beam, and influences the overall performance of steel framed buildings. Cellular beams are usually made of structural steel, but can also be made of other materials. A cellular beam has round openings (circular pattern) while the castellated beam has hexagonal openings (hexagonal pattern), both of which are achieved by a cutting and welding process. The difference between cellular beam and castellated beam is the visual characteristic. The advantage of the steel beam castellation process is that it increases strength without adding weight, making both versions an inexpensive solution to achieve maximum structural load capacity in building construction. Cellular beam is a further development of the traditional castellated beam.
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