We present in this article an architecture with its correspondent system implementation for the exploitation of semantic aspects in the computer assisted design of Steel Detailing Structures (Structural Design). Our architecture is based in a domain specific standardization effort called CIS/2 that was modeled from a knowledge point of view using an OWL (Ontology Web Language) compliant ontology. As test case we present a collection of applications based in the proposed schema that were developed within the frame of an R&D project in which an actual structural engineering company participated as test user.