Diseño y comparación económica de la superestructura de un puente de un solo vano considerando variantes de losa con vigas de hormigón postensado y vigas de acero : Evaluación técnica, constructiva y económica de la superestructura de un puente de un solo vano tipo viga-losa con vigas de hormigón postensado.

Abstract

In the present curricular integration work, the technical and economic design of the superstructure of a simply supported 28-meter-long girder-slab bridge with post-tensioned concrete girders is addressed. The AASHTO LRFD 2020 code, supplemented by ACI 318-19, NEC-15, and NEVI-12, was employed for the technical design. As for the economic design, the method of unit price analysis was used. Considering the finalized design, a comparison is conducted with the steel variant. The aim is to determine which of the options proves more advantageous in terms of its applicability in Ecuador. The designed superstructure features a cross-sectional width of 8 meters, including 1-meter cantilevers at the ends. This structure consists of 4 beams arranged at a 2-meter separation. The traffic surface comprises two lanes of 3.6 meters in width, covered with a layer of asphalt bitumen. No sidewalks or intermediate curbs are present. The results yield the definitive dimensions of the elements, the total weight of the superstructure, quantities of work, construction scheduling, and budget. An overall cost of $113,578.33 for the superstructure is obtained, translating to $507.05/m2. Upon completing the proposed comparison with steel beams, the conclusion is reached that the use of concrete girders is more cost-effective. This choice offers a significant advantage, resulting in savings of $115,684.50 compared to its counterpart.