UK office of IDEA StatiCa s.r.o.
Email: info@ideastatica.uk
Phone: +44 (0) 20 3579 9397

About IDEA StatiCa

We develop software for structural engineers and detailers. Our development team researches, tests, and applies new methods of analyzing the behaviour of structures and their members. Based on this, we created IDEA StatiCa – software that enables engineers to work faster, evaluate requirements of the national code thoroughly, and use the optimal amount of material. For us, creating software is a way to contribute to making every new construction around the world safer and cheaper.

Reinforced concrete ledge beams via CSFM

IDEA StatiCa UK - Reinforced concrete ledge beams via CSFM

Upcoming Webinar

Join us on Wednesday, 1st of September 2021 at 10:00am (BST) or 5:00pm (BST) 

Learn more about:

  • Ledge beams problems
  • Generation of CSFM model (geometry, supports, reinforcement)
  • Assessment of ledge beams
  • Comparison of CSFM and S&T (Strut-and-Tie) models

The Speakers

Petra Komarkova
Petra Komarkova
Product Engineer IDEA StatiCa
Klara Thielova
Consultant IDEA StatiCa
Do you design precast concrete structures? Are you facing design and check of the ledge beams? Are you discouraged from using Strut-and-Tie models due to the laboriousness and inability to assess ledge beams to serviceability limit states? Don’t worry; we bring a unique solution using CSFM!

In the webinar, we will discuss the problem of ledges of L- or (inverted) T-shaped beams. The typical examples from the practice of precast reinforced concrete structures will be presented. We will outline a possible workflow of design and check of the ledge beams. First, we start working in IDEA StatiCa Beam to design and check the beam in the longitudinal direction. Then, we go to IDEA StatiCa Detail, where the discontinuity region – ledge beam in transverse direction will be modeled. Such a concrete member will be reinforced, subjected to the loads, and analyzed via CSFM. We will go through the results and assess the detail for limit states, both ultimate and serviceability. Finally, we will compare the results obtained using the Stru-and-Tie method with the results provided by CSFM.

In the first step, the ledge L-shaped beam is analyzed in the longitudinal direction. It is necessary to model the beam in 3D in order to capture eccentrically acting load effects. The stirrups are designed for shear and torsion in the longitudinal direction.

IDEA StatiCa UK - Ledge of a L-shaped beam subjected to line loads

In the second step, a transverse transmission of loads is analyzed. In addition, the stirrups designed in the first step must safely transmit the tension caused by acting loads on the ledges to the longitudinal direction of the beam.

IDEA StatiCa UK - Topology optimization of a ledge L-shaped beam

Compatible stress field method (CSFM) is implemented in the IDEA StatiCa Detail app. This method was developed to design and code-check reinforced concrete details, especially the discontinuity regions and walls. Validation and verification of the CSFM solution is an essential part of the process of IDEA StatiCa software development. There has been extensive research done in this field, which is available on the IDEA StatiCa webpage and in the book Compatible Stress Field Design of Structural Concrete by prof. Kaufmann.


IDEA StatiCa Beam provides an economic and complex design for your everyday engineering work. We use cutting-edge methods for FEM modeling and nonlinear checks for ultimate, and serviceability limit states. According to Eurocode (EN) and SIA, the code-checks are performed for bridges of small and medium spans, buildings, and liquid retaining structures. Always according to the latest code updates and national annexes. A wide range of possibilities in check settings covers cast-in-place, precast and composite structures.

Sign in for this webinar for free and calculate yesterday’s estimates with us!

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