The elastic stability (bifurcation) response of space frames, includin
g warping deformation and flexible (semi-rigid) connections, is consid
ered. Calculation of the elastic stability load is based on a linear e
igenvalue analysis. A parametric study of the effect of connection rig
idity for a portal space frame of variable geometry subjected to gravi
ty and various wind loads is presented to provide insight into the sta
bility behavior of space frames.