On a structural analysis system for plane frames combined with the data base of semi-rigid connections

In order to accurately estimate the second-order effects on the behavior of steel frames with semi-rigid connections as well as to perform the practical design more easily and rationally, an attempt was made to develop a structural analysis program which precisely considers the characteristics of semi-rigid connections. This program is composed of the following three main routines : (1) The procedure for the structural analysis based on the method presented by Goto-Chen. This method, which uses closed-form solutions, takes into account the geometrical nonlinearity along with the inelastic property of connections. (2) Program PACOM (Parameter Analysis of COnnection Models) to prepare the parameters for the prediction equations of semi-rigid connection models which was developed based on the program SCDB (Steel Connection Data Bank). (3) Graphic routine for drawing the general configration and sectional force diagrams of the overall structure under the proposed loading step and likewise for the hystersis loop in relation to the connection moment and relative rotation. Developement of this system was effectively done by using Engineering Work Station (EWS) with a drawing function on a CRT display