000022593 001__ 22593
000022593 005__ 20170724144656.0
000022593 04107 $$aeng
000022593 046__ $$k2017-07-04
000022593 100__ $$aAmerio, Luca
000022593 24500 $$aExperimental and numerical aerodynamic optimization of a post-tensioned concrete railway bridge in tandem arrangement with a truss road bridge

000022593 24630 $$n7.$$p7th European and African Conference on Wind Engineering 
000022593 260__ $$bl'Association pour l'Ingénierie du Vent
000022593 506__ $$arestricted
000022593 520__ $$2eng$$aThis paper deals with the aerodynamic design of the Rio Ozama railway bridge in St. Domingo on the Metro line 2, which is in tandem arrangement with an existing truss road bridge. The aerodynamic performances of the deck were studied using wind tunnel tests on 1:20 scale sectional models, and 2D steady RANS CFD simulations were used to preliminary investigate the effects of different tailoring of the deck shape aimed at optimizing its aerodynamic behavior. The initial shape of the deck, which was a classical bluff section, showed poor aerodynamic performances, like large drag coefficient, negative derivative of the lift coefficient, and negative aerodynamic damping inside the design wind speed range. Due to the advanced stage of the design and to structural limitations, it was not possible to switch the shape of the deck to a classical streamlined closed box, and only minor modifications were allowed. The shape tailoring was studied for the stand-alone configuration by means of CFD RANS simulations and experimentally verified in tandem arrangement through wind tunnel tests also at low reduced velocities. The optimization procedure led to three main changes that allowed to achieve an optimal aerodynamic behavior: embedded rails, rounded trailing edges, and enhanced barrier porosity. The work presented shows how CFD simulations can be inserted into a typical wind tunnel tailoring of deck sections. They can be a powerful tool to understand what changes can be more effective, since it is possible to decompose the contribution of each part of the deck section to the overall aerodynamic behavior, and to understand which tailoring can be more effective.

000022593 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022593 653__ $$a

000022593 7112_ $$a7th European and African Conference on Wind Engineering$$cLiège, BE$$d2017-07-04 / 2017-07-07$$gEACWE2017
000022593 720__ $$aAmerio, Luca$$iZasso, Alberto$$iRocchi, Daniele$$iArgentini, Tommaso
000022593 8560_ $$ffischerc@itam.cas.cz
000022593 8564_ $$s782622$$uhttps://invenio.itam.cas.cz/record/22593/files/141.pdf$$yOriginal version of the author's contribution in proceedings, id 141, section .
000022593 962__ $$r22493
000022593 980__ $$aPAPER