Modern technology is advancing faster than we care to think. Our engineering marvels of the past are quickly becoming obsolete. Many bridges are built using classic designs which can be greatly improved with new technology. Modern technology allows bridges to be built from state of the art materials with superior strength and versatility (Wilson I). The arch is one of the older forms of bridge used in many Roman structures. It is like an inverted …showed first 75 words of 644 total…

…showed last 75 words of 644 total…a 6300 concrete-steel beam to hold. The concrete beam began to crumble under the stress where as the composite beam only sagged 1.73 inches (Composite II). In the future we will see more and more concrete bridges being torn down and replaced with state of the art composite structures. Outline I. Intro II. Examples of bridge types A. Arch B. Girder C. Box Girder D. Cable Stayed E. Suspension III. Strength A. Concrete-Steel B. Composite IV. Conclusion