We consider an SU(2) × U(1) gauge theory with nonlinearly realized spontaneous symmetry breaking as a model for electroweak interactions in which no physical Higgs particle occurs. It contains a further triplet of heavy vector fields (in addition to the ordinary gauge bosons Wμand Yμ). The theory is nonrenormalizable and therefore new interactions are generated at each loop level. We construct invariant new effective terms representing such interactions and calculate the 1-loop induced parameters corresponding to some of those terms. In particular, we determine the 1-loop induced cubic self-interactions of gauge bosons (light and heavy ones). We show that they are of Yang-Mills type and do not lead to anomalous magnetic or electric moments. They should show up as a considerable breaking of fermion-gauge boson coupling universality. © 1991.