Composite Design: Effective Width – Part 03


Welcome to Part 03, where we continue our exploration into the intricacies of Prokon’s composite design modules. Building upon the insights gained in Parts 01 and 02, this section delves even deeper into the effects of Effective Width values on composite design outcomes. Through detailed analysis and experimentation, we aim to uncover additional nuances and provide further clarity on optimizing design parameters within Prokon’s framework.

Three identical composite models were created, with the only difference being the magnitude of the Effective Width value, positioning the Plastic Neutral Axis (P.N.A) within the concrete slab, beam flange, and beam web, respectively. Load Case Results for each scenario were noted to assess the impact of Effective Width on composite design resistance.

The inputs for all three scenarios (excluding the Effective Width) are as follows:

Effective Width values for each scenario are as follows:

  • Scenario 1: Effective Width = 1500mm. P.N.A is located within the concrete slab.
  • Scenario 2: Effective Width = 1000mm. P.N.A is located within the beam’s flange.
  • Scenario 3: Effective Width = 400mm. P.N.A is located within the beam’s web.

The Load Case Results in order of Scenario 1 to Scenario 3 are as follows:

Interestingly, while M,hog and V resistances remained consistent across scenarios, significant variations were observed in M,sag resistance, highlighting the importance of Effective Width as a key parameter. The questions arise: how does the depth and reinforcement of the concrete slab contribute to resistance values, and to what extent does the position of the P.N.A on the steel beam influence other resistance values? Returning to Part 01, we also need to understand what the Eurocode 4 means by a “Global Analysis“, so that we do not over simplify the calculation of a critical parameter.

Future content will address these questions in greater detail, so stay tuned for further insights.

NB – The above content serves as a guide and should be used at your own risk.

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