Abstract
For bridges, especially large span bridges, wind load variations have a large impact on the bridge and therefore wind resistance is an important factor in evaluating the bridge design. Given that bridge wind resistance design mostly relies on wind tunnel tests, the cost is high. In this paper, a more complete bridge wind resistance design system is proposed, based on numerical simulation optimization, which is cost effective and efficient. The wind loads are obtained by applying the established generic wind load calculation model through extreme value analysis of available wind speed data, finding wind speed distribution maps and calculating several design reference wind speeds using road bridge wind gauges. Based on the bridge cross-section geometry and material properties, a basic finite element analysis model is developed to solve the static three-part force, and finally the bridge static and vibration analysis is obtained. This paper takes the Qinglan Bridge in Hainan Province, China, as an example, and uses the wind resistance design model proposed in this paper to find the final design reference wind speed of 32.3906m/s. The horizontal wind loads of the bridge are found to be 1032.5Pa and 1349.5Pa using the general formula and the wind gauge for highway bridges respectively, indicating that the ratio of the horizontal loads found by the two formulas is 0.765 under the same conditions. The bridge foundation finite element model was used to find the three dimensional static component forces and to obtain the maximum positive stress of 89.23Mpa in the bridge main girder, which occurred at the bridge span of 798.2m. Finally, the response was found in the form of a power spectral density function using the previously inputted data on the bridge characteristics and turbulence data from the Qinglan Bridge to return the fundamental frequency for different cases.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call