Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)


Civil Engineering


In the modern practice of design of structures a variety of problems confront the structural engineer. Whether he is involved in the area of aircraft structures (i.e. stressed skin structures) or complex immovable structures, the problems are seldom simple. In the design of stressed skin structures the complexity and the refinements of analysis methods, combined with the economics of weight saving, do create many problems to be solved. Interaction of multiple force systems are among the problems of the engineer. Many types of interaction occur in practical structures. Some interaction behavior is predictable though routine stress analysis such as the computation of maximum stresses in a short block subjected to bending and axial force. Other interaction has been expressed through a combination of theory and substantial testing such as the column design formulas found in many standard specifications. Some cases of combined loading involve such complex structural behavior that an exact analytical approach even if available would be of doubtful value. Theoretical approaches must of necessity contain many fundamental assumptions which are difficult to either justify or verify because of the problem complexity. It is also noted that, in recent years, the use of light gage steel has been increasing in construction. Civil engineers are beginning to recognize that many portions of a structural framework can participate as a unit in resisting all of the forces as well as local forces applied to single members. The complexity of loading problems and lack of enough test-proved literature, prevent the designers from using many elements under combined load applications. There is a need for research in many areas of combined loading. Theoretical or empirical formulae should be available to the design engineer for use without requiring highly complex theoretical calculations. This thesis concerns the investigation and testing of a series of panel specimens for the condition of combined shear and bending loads. These panels represent small scale versions of panels used as either the web of a beam or the roof of the building. As a web in a beam, these panels must carry in-plane shearing forces much like the web of a plate grinder. Roof loads provide transverse forces which require the panel to carry as a beam the bending type loads between the edge members. Using the results of the test data, it has been possible to verify that the interaction formula applicable to this type of structure is a circular one.

Library of Congress Subject Headings

Strains and stresses

Strength of materials




South Dakota State University