AVVISO SEMINARIO Mercoledi' 11 Dicembre 2019 h 16.00 – 17.00 Aula 4 Facoltà di Ingegneria Civile e Industriale Via Eudossiana 18, Roma nell'ambito del corso di Teoria e Progetto di Ponti (Prof. F. Bontempi) Prof. Luca Caracoglia Department of Civil and Environmental Engineering, Northeastern University, Boston, Massachusetts, USA

1. Coordinatore: Prof. Dr. Patrizia Trovalusci
E-mail patrizia.trovalusci@uniroma1.it
Segreteria: Daniela Menozzi
Via Eudossiana, 18 - 00184 Roma
E-mail daniela.menozzi@uniroma1.it ; https://web.uniroma1.it/dotingstrugeo/
AVVISO SEMINARIO
Mercoledi 11 Dicembre 2019
h 16.00 – 17.00
Aula 4
Facoltà di Ingegneria Civile e Industriale
Via Eudossiana 18, Roma
nell'ambito del corso di Teoria e Progetto di Ponti (Prof. F. Bontempi)
il prof. Luca Caracoglia
Department of Civil and Environmental Engineering,
Northeastern University, Boston, Massachusetts, USA
terrà un seminario sul tema:
WIND-INDUCED VIBRATIONS ON LONG – SPAN BRIDGES:
IMPORTANCE OF WIND LOAD UNCERTAINTY PROPAGATION
Abstract:
Long-span bridges are sensitive to wind excitation due to the deck slenderness and low structural damping.
This presentation will illustrate an overview of research activities, carried out to investigate the relevance of
wind load uncertainty propagation and its effects on bridge vibrations. Uncertainty or variability can be
associated with either measurement errors (for example in wind tunnel) or structural modeling simplifications.
In the first part, a number of reduced-order models will be employed to explain the basis for the estimation of
the stationary joint-probability distribution of a generalized state vector, simulating the wind-induced bridge
response contaminated by various error sources. In the case of serviceability and turbulence-induced
(buffeting) vibration, a methodology will be presented to derive the joint-probability density function of the
random state vector, which includes the influence of errors. In the case of flutter (dynamic instability of the
bridge deck), the presentation will discuss stochastic bridge stability due to parametric perturbation.
The second part will describe a series of numerical simulation algorithms for analyzing the loss of
performance in a long-span bridge, produced by wind-induced vibration and influenced by errors in
aeroelastic loads (flutter derivatives). The approach is based on the concepts of “fragility functions”, used to
examine the probability of exceeding pre-defined deck vibration thresholds, and the analysis of long-term
maintenance costs due to deck damage. Finally, wind tunnel results on a single-box deck model will be
discussed to examine and quantify experimental errors and their effects on the prediction of bridge flutter
instability. Application examples are derived from models of either existing or simulated bridges with main
span between 1000 m and 3000 m.
Prof. Patrizia Trovalusci Prof. Franco Bontempi