I also know that there used to be a company called SMI joists that used to produce castellated beams (I think they went out of business a few years ago). I know AISC has a design guide in relation to castellated beams. The conversation revolved around alternatives to open-web steel joists and was centered around castellated beams. I had heard from a few clients that securing reasonable delivery times on open-web steel joists was becoming and issue with projects orders being placed now but not being delivered until late August. The contact was actually someone I used to work with about 10 years ago and we have kept in touch periodically.ĭuring our conversation he expressed concern in regards lead times for delivery of open-web steel joists. The solid web section between the castellated beam hollows is calculated according to ÇYTHYEDY 9.11.I was contacted by a fabricator recently in regards to helping them with some projects. The bending moment values at the upper and lower boundaries of the solid web section between the castellated beam hollows are found and lateral-torsional buckling is controlled according to the rectangular section. Web Buckling Control Forces Acting on the Web Then the combined effects are considered by finding the bending and axial force strengths of the T-section. The bending moment and axial force on the T section are calculated by the equilibrium equations. While calculating these forces, internal force diagrams in the static analysis are used. The loads on the T section that is above of the castellated beam hollow are found with the assistance of equilibrium equations. Vierendeel Control Biaxial Bending and Axial Compression Effects The shear force on the castellated beam web is calculated using the equilibrium equation and compared with the shear strength. The gross shear area is the full web part of the castellated beam and the net shear area is calculated by taking into account the hollow parts of the castellated beam as follow: Horizontal Shear Control The axial compression capacity for the solid element part of the castellated beam can be calculated as follow: Combined Effects Shear Control Gross and Net Area for Shear Control Biaxial Bending and Axial Compression Control Yielding Limit Stateįor the yielding limit state, the characteristic bending moment strength M n of the solid element is found in accordance with ÇYTHYEDY.Ĭonsidering the elastic-buckling of the element, the bending moment strength M n can be calculated as follow: Axial Compression Hexagonal and circular hollow sections are designed. Hexagonal, circular and octagonal shaped hollow sections and angelina sections can be defined. Castellated Beam Design Castellated Beam Sections

Castellated beam design software