An inverted T-beam (or double ledge beam) is typically a reinforced concrete element with the flange at the bottom edge and the web facing upward, opposite to a conventional T-beam. Therefore, the design requires special attention to shear transfer, especially at the web-flange junction. Additionally, the element must be checked for serviceability (SLS) under torsion, deflection, and cracks.
These factors make the inverted T-beam design more difficult. The classical beam theory doesn't apply here, and the codes recommend using more advanced methods. Nevertheless, the traditional approach doesn't describe the serviceability checks (SLS).
This is where the Compatible Stress Field Method (CSFM) offers a significant advantage. The CSFM addresses limitations of traditional methods by capturing the realistic nonlinear behaviour of reinforced concrete, considering the reinforcement influence. This allows it to describe the stress distribution, shear transfer, crack width, and deflection with long-term effects.
Join our free summer series webinar and learn how to use the CSFM-based application IDEA StatiCa Detail to properly model and code-check an inverted T-beam.
You will learn how to define the geometry of the beam, proper boundary conditions, and reinforcement. We'll explain the thorough analysis results. Lastly, you'll see how to generate the Bill of Materials and a detailed, customizable report.
Master your design webinar series
Master your design is a series of five short concrete design webinars for (not only) beginners to get quickly familiarized with the program. By covering the most common example, users will learn how to code-check different concrete structures quickly and safely using the IDEA StatiCa Detail application.
There are five webinars with relevant content:
12 June 2025 - Utilizing Reinforcement in Anchor Design
10 July 2025 - Master your design - Concrete Walls
31 July 2025 - Master your design - Pier Caps
20 August 2025 - Master your design - Prestressed Beam with Openings
18 September 2025 - Master your design - Precast and Infrastructure Beams
