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Influence Lines for Thrust and Bending Moments in the Fixed Arch by B. Eriksen, published by Concrete Publications Ltd in the 1940s, is a highly technical engineering treatise focused on the analysis of fixed arch structures. The book presents detailed influence line diagrams showing how applied loads move through a statically indeterminate fixed arch. These diagrams reveal how thrust forces and bending moments change depending on load position critical for engineers designing arches in bridges, buildings and other heavy structures.
In his work, Eriksen provides both theoretical derivations and practical graphical methods. He explains the concept of influence lines which represent the response of a structure to a moving load and applies them to calculate the thrust and bending behaviour in arches. The text includes several worked examples, sketches, and charts that make complex structural relationships more accessible. His treatment of fixed-arch boundary conditions, internal force distribution and load sensitivity remains relevant for engineers studying vintage structural design or seeking insight into earlier methods of structural analysis.
For structural engineers, historians of engineering, and collectors of mid-20th-century technical literature, Eriksen's book is a valuable reference. It captures an era when graphic methods were essential for design, before the widespread adoption of modern computer-based finite-element analysis. Influence Lines for Thrust and Bending Moments in the Fixed Arch therefore stands as both a historical document and a practical tool for classical structural engineering.
