Análise comparativa das verificações de uma viga protendida de uma ponte utilizando os softwares V-PRO e CSI Bridge.

Abstract

The use of prestressing in bridges and viaducts is of paramount importance in civil construction, since this system enables the use of large spans with more slender, durable, and economical structures. The design and analysis of these structures can utilize different tools to assist the designer, such as the V-PRO software, which is based on ABNT NBR 6118:2014, and the CSI Bridge software, which is based on the CEB-FIP 1990 standard (Euro-International Committee for Concrete) and the more recent CEB-FIP 2010, providing excellent productivity to the calculation process. This work aims to perform a comparative analysis of a prestressed beam of a previously constructed railway bridge, in order to verify the discrepancies in the results obtained with both tools. For this purpose, the original numerical model of the bridge was used, with all the characteristics already defined, such as geometry, materials, loads with TB-360 type trains, and cable layouts. After running the analysis in CSI Bridge, the moment results were exported to V-PRO, where a prestressed beam was modeled with all characteristics equivalent to the CSI Bridge model. Using all the information from the numerical model, only the creep coefficient (φ) and shrinkage coefficient (εcs) were calculated externally to the program, as per Annex A of NBR 6118:2014, and supplied to the V-PRO program. Finally, the two beams were processed in both programs: V-PRO using ABNT: NBR 6118:2014 as the base standard, and CSI Bridge using CEB-FIP 1990 and CEB-FIP 2010, comparing the results of prestress loss and the calculation of stresses in the SLS-F and SLS-D and ULS-ATO, verifying the particularities of both.