Alternative to Gamma Method: Semi-Rigid Composite Beam as Framework Model 1

Tips & Tricks

Besides the standardized gamma method, you can display the semi‑rigid composite beams also as a framework model. In comparison with the gamma method, the framework model has, among others, the following advantages:

  • Arbitrary position and distance of fasteners
  • Irrespective of support quantity and condition
  • Arbitrary load

Modeling

A T‑section (web NH C24, flange LH D50) is to be modeled. In addition, the web and the flange are to be connected by coupling members with releases (rigid members) to as many discrete points as possible in order to detect identical deflections of both elements.

The next step is to place a member into position where the fastener is situated. These are rigidly attached to the web and the flange and are shown by definable flexural stiffness / shear stiffness of the fasteners. A release is placed at the level of the composite joint.

The determination and input of the flexural stiffness of members will be described in the second part of this article.

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