Girder: All structural materials for reinforced concrete and the standard acceptance tests for such materials are prescribed under the ACI (American Concrete Institute) Code which is a leading authority for inspection, project management and consulting for individuals and organizations involved in construction and concrete design. The ACI revises its specifications time to time to facilitate improvements in production methods, materials, and testing. Beam and girder are the two frequently used codes in structural systems, specifically in the 1995 ACI Code. Both are subjected to flexural loads and act as primary part of the structural framing system. Both are horizontal members and among the most commonly designed elements of structure. Both the terms are often used interchangeably but certain factors distinguish one from the other. Understanding the difference between the two is crucial to construction scene. Read more: Difference Between Beam and Girder