RESPONSE OF STRUCTURAL STEEL FRAME BY USING SEMI-RIGID CONNECTIONS

Civil Engineering

It is obvious that real beam-to-column connections have some stiffness, in between the extreme cases of fully rigid and ideally pinned. Generally it is assumed that the joints and supports in the structure are pinned or rigid while performing analysis. Several papers prove that in actual framed structures, rigid connections have some degree of flexibility, while pinned connections have some stiffness. But assuming joints to be rigid or pinned may not give effective results. So semi rigid connection should be considered to obtain more accurate, reliable and also cost-effective results. This paper presents analysis & design of 3 storey steel framed structure with rigid, pinned & semi-rigid connections, under the effect of dead load, live load & seismic load (EQ). As suggested by IS 800:2007 (Annexure-F) secant stiffness (rotational stiffness) based on Frye-Morris polynomial model is used for analysis of semi-rigid structure. Values of secant stiffness are incorporated in analysis for all alternatives using STAAD Pro in place of assumption of ideal rigid and pinned end conditions. Analysis results in terms of parameter like shear force, bending moments, axial force in the member, top storey displacement, weight of frame for rigid & pinned connection have been compared with corresponding results for various semi-rigid connections.

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.