IABSE Task Group 3.1.: Super Long Span Bridge Aerodynamics
The IABSE Task Group 3.1. “Super Long Span Bridge Aerodynamics” has the mandate to define reference results for the validation of methodologies and programs used to study both stability and buffeting responses of long-span bridges. These tools for the simulation of the aeroelastic behaviour are fundamental in the safe design of bridges and they should be validated. The working group decided to set up a benchmark procedure consisting of several steps to define reference results for this validation. For each step, contributors use their own methodology to simulate the bridge behaviour using the same input data. All the results are then compared, and reference values are defined through statistical analysis. The benchmark procedure is considered as a three-step problem with substeps of increasing difficulty: Step 1 compares numerical results only, Step 2 is validation against wind tunnel experiments, and Step 3 is validation against full-scale data.
Nonlinear aerostatic stability of long-span bridges
An efficient method for analyzing the nonlinear aerostatic stability of long-span bridges using a modal formulation is proposed. First, a simplified linear version defined as modal-based approach is introduced, which evaluates the bridge displacements using the modal properties of the bridge and speeds up the assessment of the critical velocity by applying a root-finding algorithm. Then, this scheme is further developed to identify the instability limit point in nonlinear structures by combining nonlinear FEM analyses with the linear version of the modal-based approach and a root-finding algorithm in an outer loop. The effects of considering the three components of the wind loads, the stays sag effect, structural nonlinearities, aerodynamic nonlinearities, and the initial wind angle of attack, are analyzed and discussed. The computational advantages of the proposed method and its accuracy are demonstrated through three application examples, including a simplified linear 1 DoF system, and linear and nonlinear FEM models of a full cable-stayed bridge. The collapse mechanism of the cable-stayed bridge is driven by the stiffness degradation of the stays caused by the deck vertical upward displacements. It has been found that the influence of the nonlinear aerodynamic features is very low when the structural nonlinearities control the bridge collapse.
Journal papers
Diana G, Stoyanoff S, Allsop A, Amerio L, Andersen M, Argentini A, Calamelli F, Cid Montoya M, de Ville V, Hernández S, Jurado JA, Kavrakov I, Larose G, Larsen A, Morgenthal G, Rocchi D, Svendsen M and Wu T (2022). IABSE Task Group 3.1 benchmark results. Numerical full bridge stability and buffeting simulations. Structural Engineering International (IABSE), In press. DOI: 10.1080/10168664.2022.2104188
Cid Montoya M, Hernández S, Kareem A, and Nieto F. (2021) Efficient modal-based method for analyzing nonlinear aerostatic stability of long-span bridges. Engineering Structures, 244: 112556.
DOI: 10.1016/j.engstruct.2021.112556 [Open Access]
Diana G, Stoyanoff S, Aas-Jakobsen k, Allsop A, Andersen M, Argentini A, Cid Montoya M, Hernández S, Jurado JA, Katsuchi H, Kavrakov I, Kim H-K, Larose G, Larsen A, Morgenthal G, Oiseth O, Omarini S, Rocchi D, Svendsen M and Wu T (2020). IABSE Task Group 3.1 benchmark results. Part 2: Numerical analysis of a 3-degree-of-freedom bridge deck section based on experimental aerodynamics. Structural Engineering International (IABSE), 30(3):411-420
DOI: 10.1080/10168664.2019.1661331
Diana G, Stoyanoff S, Aas-Jakobsen k, Allsop A, Andersen M, Argentini A, Cid Montoya M, Hernández S, Jurado JA, Katsuchi H, Kavrakov I, Kim H-K, Larose G, Larsen A, Morgenthal G, Oiseth O, Omarini S, Rocchi D, Svendsen M and Wu T (2020). IABSE Task Group 3.1 benchmark results. Part 1: Numerical analysis of a 2-degree-of-freedom bridge deck section based on analytical aerodynamics. Structural Engineering International (IABSE), 30(3):401-410
DOI: 10.1080/10168664.2019.1639480
Conferences
Diana G, Stoyanoff S, Allsop A, Amerio L, Andersen M, Argentini A, Cid Montoya M, De Ville V, Hernández S, Jurado JA, Kavrakov I, Larose G, Larsen A, Morgenthal G, Omarini S, Rocchi D, Svendsen M (2021). “Super-long span bridge aerodynamics benchmark: additional result for TG3.1 Step 1.2” IABSE Congress Ghent 2021 – Structural Engineering for Future Societal Needs. Sept 22-24, Ghent, Belgium.
Diana G, Stoyanoff S, Aas-Jakobsen k, Andersen M, Argentini A, Cid Montoya M, Hatami A, Hernández S, Jurado JA, Katsuchi H, Kavrakov I, Kim H-K, Larose G, Larsen A, Oiseth O, Omarini S, Pathak R, Rocchi D, Svendsen M and Wu T (2019). “Super-long span bridge aerodynamics: on-going results of the TG3.1 benchmark test” 2019 IABSE Congress New York City: The Evolving Metropolis. September 4-6, New York, NY, USA.
Attendance to technical meetings and research short visits
2019. IABSE Task Group 3.1. 4 th Annual Meeting in New York, USA (2019 IABSE Congress, 09/02/2019).
2018. IABSE Task Group 3.1. 3 rd Annual Meeting in Nantes, France (40 th IABSE Symposium, 09/19/2018).
2018. Research visit (2 days) to Politecnico di Milano, Italy.
2017. Research visit (3 days) to Politecnico di Milano, Italy.