【作者】 薛瑞龙；

【导师】 王元战；

【作者基本信息】 天津大学 ， 港口、海岸及近海工程， 2009， 硕士

【摘要】 我国虽有漫长的海岸线，沿海大陆架的石油资源储量也较丰富，但随着近些年全球对能源需求的急剧扩张，原本被认为开发价值不大的浅海油田也越来越受到重视。由于环境政策的限制性，造价的经济可行性和结构强度的可靠性等要求，开发一种专门针对浅海地区(水深3~10m)的新型结构解决上述问题非常有研究意义，且社会效益大。本文以某项目的可行性研究为背景，对新型高桩混凝土梁板式海洋平台结构的设计方法，冰激振动响应分析、地震反应谱分析和疲劳特性分析进行了研究。本文的主要工作包括以下几个方面：1.结合国内外海洋钻井平台和港口码头规范、标准和文献等，共设计了结构断面桩距为6.5m和10.5m的100m×100m的两个单平台结构，两个60m×50m和一个100m×40m的小平台组成的组合平台结构。由于篇幅原因，本文仅对60m×50m平台进行设计介绍。2.研究了静冰荷载，冰激振动和改进Matlock模型，得到一个周期性动冰荷载，并使用P-y曲线法建模分别进行了动静冰荷载的有限元计算分析，比较了两者的计算结果差异和联系。3.研究了地震静荷载，地震谱，地震波及随机地震振动法，并采用m法建模分别进行有限元的地震拟静力计算和地震反应谱分析，比较了两者的计算结果差异和联系。4.对新型平台的钢管桩进行了动冰荷载的疲劳特性分析，对比不同荷载幅值和不同周期情况下钢管桩最危险位置的应力疲劳，结合疲劳分析的基本理论，使用雨流法程序统计所提取出的时程应力得到应力的幅值和循环次数，计算得到疲劳强度，判断疲劳强度是否满足，最后再根据S-N曲线计算得到疲劳寿命。更多还原

【Abstract】 Though there is a long coastline in China, and there is abundant in oil resources incoastal continental shelf, with global energy demand of rapid expansion in recentyears, more and more attention need to be addressed to which was considered of littlevalue to develop the shallow oil field. However, due to restrictive environmentalpolicies, and the economic feasibility of the cost structure, and the reliability ofstrength, so creating a new structure aiming at shallow areas (water depth of 3 ~ 10m)to solve the above problem has a great significance, and brings great social benefits.In this paper, based on a feasible research of project, I explore the design’s methodology, iceinducedvibration, fatigue analysis and seismic response characteristics of spectral analysis for anew platform structure– concrete slabs and beams platform on standing pile. The mainwork of this study includes the following:1. Combination of domestic and foreign norms, standards and documentation of the offshoredrilling platforms and the port, I designed two types of platforms: one is two single-platforms for100m×100m whose distance of vertical piles are 6.5m and 10.5m, and the other is acombinatorial platform form two platform for 60m×50m and one for 100m×40m. For lack ofspace, this study only introduces the design condition of 60m×50m platform.2. Study on static ice load, ice-induced vibration and improve Matlock model to obtain acyclical dynamic ice loads. With the P-y curve method, carry out the finite elementanalysis on the model with static and dynamic ice load, and compare the differenceand connection between the results.3. Study of the static load earthquake, seismic spectrum, Seismic waves and random seismicvibration. With the M law, analyse the earthquake and its response spectrum based onthe finite element models, and compare the difference and connection between theresults.4. Analyse the fatigue properties of the new platform for the steel pipe due to the dynamic iceload, and compare the fatigue stresses in the most dangerous steel pipe among different loadamplitudes and load cycles, Combined with the basic theory of fatigue analysis, with rainflowmethod, calculate the fatigue strength to determine whether to meet the strengthand fatigue life in accordance with S-N curves based on the obtained statistical stressamplitudes and cycles.更多还原