Author:
Zhou Rui,Lin Yinan,Lu Peng,Yang Yongxin,Zhu Jinbo
Abstract
Abstract
Non-stationary characteristic in nature wind has a great effect on buffeting performance of long-span bridges. The influence of key parameters in non-stationary wind velocity models on nonlinear buffeting responses of a super long-span suspension bridge was investigated in this paper. Firstly, four non-stationary wind velocity models are established by combing the time-varying average wind velocity with an exponential function and the fluctuating wind velocity with four modulation functions, respectively. These non-stationary wind velocity models have obvious non-stationary characteristics and then are validated by the classical power spectrum densities. Finally, three displacement responses of the bridge deck under four different independent variables of β in the exponential function and four modulation functions were compared, respectively. Results show that the turbulence intensities using two non-uniform modulation functions (NMF) are larger than those using uniform modulation functions (uMF). Moreover, the root mean square (RMS) values of three displacement responses increase with the decrease of β. Besides, the RMS values of three displacement under two NMFs are larger than those under two uMFs, and their RMS values under the second uMF are the smallest.
Funder
National Natural Science Foundation of China
Guangdong Province Natural Science Foundation
henzhen Science and Technology Innovation Program
Key Laboratory for Resilient Infrastructures of Coastal Cities (Shenzhen University), Ministry of Education
the Foundation of State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University
Publisher
Springer Science and Business Media LLC
Subject
Mechanical Engineering,Aerospace Engineering,Modeling and Simulation,Renewable Energy, Sustainability and the Environment,Civil and Structural Engineering