Optimal ratio of spans of continuous bridges

The article deals with the creation of continuous metal and monolithic reinforced concrete bridge spans, which are most effective. Efficiency is achieved by finding opportunities for unification structures successful options providing them required load-bearing capacity lowest cost building materials. bending moments that occur in sections a structure distributed more evenly take on smaller values span than split structure. However, efficiency can be further improved introducing certain coefficient length extreme spans relative to average ones. This allows you achieve equality reference or moments. As result, design will work such way it possible build as if from three types unified blocks, reduce complexity construction work. an example, this case, ratio corresponding division into blocks four-span bridges determined.