Title: Extrapolation of extreme traffic load effects on a cable-stayed bridge based on weigh-in-motion measurements
Authors: Naiwei Lu; Yang Liu; Michael Beer
Addresses: School of Civil Engineering, Changsha University of Science and Technology, Changsha Hunan 410114, China ' School of Civil Engineering, Changsha University of Science and Technology, Changsha Hunan 410114, China ' Institute for Risk and Reliability, Leibniz Universität Hannover, Hannover 31509, Germany; Institute for Risk and Uncertainty, University of Liverpool, Liverpool 69 3BX, UK
Abstract: The steadily growing traffic loading may become a hazard for the bridge safety. Compared to short and medium span bridges, long-span bridges suffer from simultaneous presence of multiple vehicle loads. This study presents an approach for extrapolating probabilistic extreme effects on long-span bridges based on weigh-in-motion (WIM) measurements. Three types of stochastic traffic load models are simulated based on the WIM measurements of a highway in China. The level-crossing rate of each stochastic traffic load is evaluated and integrated for extrapolating extreme traffic load effects. The probability of exceedance of a cable-stayed bridge is evaluated considering a linear traffic growth model. The numerical results show that the superposition of crossing rates is effective and feasible to model the probabilistic extreme effects of long-span bridges under the actual traffic loads. The increase of dense traffic flows is sensitive to the maximum load effect extrapolation. The dense traffic flow governs the limit state of traffic load on long-span bridges.
Keywords: bridge; traffic load; extreme value; level-crossing theory; weigh-in-motion; probability of exceedance.
International Journal of Reliability and Safety, 2018 Vol.12 No.1/2, pp.69 - 85
Received: 03 Feb 2017
Accepted: 15 Nov 2017
Published online: 13 Jun 2018 *