By R. K. Bansal
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Additional info for A Textbook of Strength of Materials (In S.I. Units)
His way, the theoretical maximum span length could be increased by almost 100%, to more than 10,000 m. For the present discussion, however, we will keep the girder constant for simplicity sake. 4 Girder Bridges here is no clear cut criterion for estimating the maximum span of a girder bridge. Presently, girder bridges are the only bridge type in which some of the longest spans were entirely or partially built with concrete. he current longest span steel girder bridge is the 300-m span Rio Niteroi Bridge in Brazil, which was completed in 1974.
Previously, we estimated that the maximum possible span of a suspension bridge is about 8000 m. If we accepted this as common wisdom, we would never venture further. But if we ask why, we would discover that the allowable stress is the limiting factor in this case. Understanding the “why” of things helps us to ind solutions to problems and push the boundaries of what is possible. In this instance, inding a material that has a higher allowable stress can increase the maximum span length. ” comes in.
He cable anchorage that links a cable to the tower, for instance, is usually a weaker point on the load path. It is weaker than the cable and it is weaker than the tower. hus, in a conceptual design, the load path must be very clearly deined, and all linkages must be properly established. 2 Taking Advantage of Redundancy: Permanent Load Condition For a long time, and as is still oten the case today, a bridge is analyzed as a two-dimensional structure. hus, it has only to satisfy three basic equations according to applied mechanics: ∑ Fx = 0 ; ∑ Fy = 0 ; ∑ M = 0.
A Textbook of Strength of Materials (In S.I. Units) by R. K. Bansal