We have done an experiment to find deflection on a steel frame as shown in image attached .the frame consist of two i-section columns and one i-section beam. Load is applied at mid point of the beam and deflection is measured. This deflection is found to be between the deflection due to simply supported ends and fixed ends.
This may be due the flexibility between beam and column connection. I want to determine the stiffness of this semi rigid connection.
IS-800-2007 clause 10.6.1 Annex F 4.3 gives a procedure to find the stiffness but I am not able to apply either of the cases given in figure 32 page 132 to my case. The connection details of our frame are in the image attached. We had already solved it as per IS 800 2007 but results are not satisfactory.
Any solved example/other guiding material regarding the same would be appreciated.
Just a hint, solve it assuming rigid beam. Find the reaction force at the ends of beam. They will be same as the force in the joint (Axial and shear force in the bolt). Find the deformation in bolts due to these forces and add it to the beam deflection.
I am not sure whether this will give you exact answer, but it can be a factor which add to extra deflection in rigid beams.
Hope this helps.
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