Dynamic Characteristics and Simplified Numerical Methods of An All-Vertical-Piled Wharf in Offshore Deep Water

• Published in: China ocean engineering Vol. 29; no. 5; pp. 705 - 718
• Main Author: 张华庆 孙熙平 王元战 尹纪龙 王朝阳
• Format: Journal Article
• Language: English
• Published: Nanjing Chinese Ocean Engineering Society 01.10.2015; Tianjin Research Institute Water Transport Engineering, MOT, Test Detection Center of Water Transport Engineering, Tianjin 300456, China%Tianjin Key Laboratory of Harbor & Ocean Engineering, Tianjin University,Tianjin 300072, China
• Subjects: Coastal Sciences; Engineering; Fluid- and Aerodynamics; Marine & Freshwater Sciences; Numerical and Computational Physics; Oceanography; Offshore Engineering; Simulation; 全直桩码头; 动力特性; 动力计算; 循环荷载作用; 数值方法; 波浪作用; 深水桩; 码头结构; wave cyclic loads; dynamic response; simplified calculating methods; offshore deep water port; all-vertical-piled wharf; dynamic characteristics
• ISSN: 0890-5487; 2191-8945
• DOI: 10.1007/s13344-015-0050-y

There has been a growing trend in the development of offshore deep-water ports in China. For such deep sea projects, all-vertical-piled wharves are suitable structures and generally located in open waters, greatly affected by wave action. Currently, no systematic studies or simplified numerical methods are available for deriving the dynamic characteristics and dynamic responses of all-vertical-piled wharves under wave cyclic loads. In this article, we compare the dynamic characteristics of an all-vertical-piled wharf with those of a traditional inshore high-piled wharf through numerical analysis; our research reveals that the vibration period of an all-vertical-piled wharf under cyclic loading is longer than that of an inshore high-piled wharf and is much closer to the period of the loading wave. Therefore, dynamic calculation and analysis should be conducted when designing and calculating the characteristics of an all-vertical-piled wharf. We establish a dynamic finite element model to examine the dynamic response of an all-vertical-piled wharf under wave cyclic loads and compare the results with those under wave equivalent static load; the comparison indicates that dynamic amplification of the structure is evident when the wave dynamic load effect is taken into account. Furthermore, a simplified dynamic numerical method for calculating the dynamic response of an all-vertical-piled wharf is established based on the P-Y curve. Compared with finite element analysis, the simplified method is more convenient to use and applicable to large structural deformation while considering the soil non-linearity. We confirmed that the simplified method has acceptable accuracy and can be used in engineering applications.