International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP) (12th : 2015)

System reliability of suspension bridges considering static divergence and flutter Øiseth, Ole; Rönnquist, Anders; Naess, Arvid

Abstract

The Hardanger Bridge has recently been constructed in Norway. The main span is 1310 m, and since the bridge has only two traffic lanes and one lane for bicycles and pedestrians, it is very slender and susceptive to wind induced vibrations. The reliability of the Hardanger Bridge considering static divergence and flutter is studied in this paper. An extensive finite element model of the structure is used to obtain the still-air dynamic properties of the bridge while results from wind tunnel tests are used to represent the aerodynamic properties in terms of aerodynamic derivatives and static load coefficients. The mean wind velocity at the site is represented by a Gumbel distribution and the scatter in the experimental results of the aerodynamic derivatives and static load coefficients are modelled as correlated Gaussian variables. It is shown that by exploiting the regularity of the probability of failure, the system reliability can be predicted using a reasonable amount of simulations.

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