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论文类型：期刊论文

发表时间：2020-01-01

发表刊物：SOIL DYNAMICS AND EARTHQUAKE ENGINEERING

收录刊物：EI、SCIE

卷号：128

ISSN号：0267-7261

关键字：Bridges; Stochastic ice loads; Dynamic analyses; SSI

摘要：The Gulf of Bohai has a huge area of floating ice in winter each year, and when seawater freezes, significant uncertainties are introduced in the offshore structural design. In this study, a complete bridge analysis model is proposed to investigate the dynamic responses of offshore bridges in the Bohai Sea subjected to stochastic ice loads by floating sea ice. Based on a real stochastic ice load spectrum, a simulation methodology to generate the stochastic ice load process is proposed. The soil resistance is modelled utilising the American Petroleum Institutebased cyclic p-y, t-z, and Q-z springs. A dynamic analysis is conducted in the time domain utilising the finite element method and considering stochastic ice loads. The influences of undrained soil strength and water depth on the dynamic behaviours of the bridge are systematically investigated. The results show that the dynamic responses of bridges in deep water are much larger than those in shallow water, and the soil-structure interaction (SSI) can substantially affect the structural vibrations. The result from the method can also be used to identify the most critical condition for bridge design under ice loads.