Arrangement structure of prestressed beam after beam growth and design method thereof

The invention discloses an arrangement structure of a prestressed beam after beam growth and a design method thereof. The structure comprises a new cantilever straight segment (1) and a side span curved segment (2). The new cantilever straight segment (1) is arranged adjacent to a pier (5). The side span curved segment (2) includes an unadjusted side span curved segment (2.1) and an adjusted sidespan curved segment (2.2). The new cantilever straight segment (1), the unadjusted side span curved segment (2.1) and the adjusted side span curved segment (2.2) are sequentially poured from right toleft. The new cantilever straight segment (1) and the side span curved segment (2) are both combined by a plurality of pouring nodes (3) poured by segment. The arrangement structure and the design method overcome the shortcomings of complex construction process, high construction cost and high construction safety risk in the existing three conventional methods, and have the advantages of achievingless modification of the o