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 acero.

Abstract

This curricular integration work has as purpose to carry out the technical and economic design of the superstructure of a simply supported 28-meter slab-beam bridge applying the steel beam variant to compare it with the post-tensioned concrete beam variant. The superstructure to be designed comprises a cross section of 8 meters wide including overhangs of 1 meter at the ends, it has 4 I-shaped steel beams separated 2 meters from each other, in addition, type "K" steel diaphragms will be placed between beams. The circulation surface consists of two lanes 3.6 meters wide and a layer of bituminous asphalt, there are no sidewalks or intermediate curb. For the technical design, the AASHTO LRFD 2020 standard was used, supplemented by ACI 318-19, NEC-15, and NEVI-12. While the unit price analysis method was used for the economic design. As results, the dimensions of the elements contemplated in the design, percentages of demand-capacity in beams and diaphragms, the total weight of the superstructure, quantities of work, work programming and the budget were obtained. From the economic analysis, the total cost of the superstructure is $229,262.83, giving a cost per square meter of $1,023.49/m2. After the proposed comparison with the variant of post-tensioned concrete beams, it was concluded that the use of steel beams results in a higher total cost, with a difference of $115,684.50 in the budget and $516.45/m2 in the cost per square meter.