No, licensing does not qualify a structural engineer. What qualifies a structural engineer is being willing to sign a legal document when, say, a bridge is completed, that says that they take legal responsibility for the bridge's safe functioning, and agree to be held legally liable if it fails. Licensing just means that, in addition to knowing enough about structural engineering to be willing to make such a legal commitment, they also have to get a piece of paper from the government before they can sign off legally as the structural engineer of record for a project.