Aiming at the construction difficulties of preflex composite beam,the construction technology of 40 m large span preflex beam was analyzed,it was pointed out that preflex composite beam has wide application prospect in urban bridge building.

A FEA method for composite beam bridge is presented by an example of a preflex beam with variable cross-section.

A method for calculating ultimate flexural strength of preflex composite beam with the elasto-plastic effect of steel;

Research on elastic-plastic ultimate capacity of preflex beam bridges;

This paper introduced the fundamental of preflexed beam; Aggregated the research development of preflexed beam at home and abroad in the past years; Discussed the material modeling and selected the stress-strain relationship of steel and concrete which is suitable for the nonlinear analysis of preflex beam; In.