复合筒型基础预应力过渡段结构优化设计
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摘要
以江苏启东海域某海上风电工程的筒型基础为研究对象,通过大型有限元软件ABAQUS对初始筒型基础结构建立多种试算模型并进行有限元计算,重点研究弧形过渡段结构张拉控制应力、预应力孔道数量和布置、预应力钢绞线数量以及各类普通钢筋配置方式等因素对筒型基础新型预应力弧形过渡段传力特性及整体结构承载性能的影响.根据模型计算结果,确定最终优化调整方案为:施加有效预应力1,000,MPa,预应力孔道数量不变,钢绞线根数优化为10根,竖向普通钢筋为60道φ25,mm,环向钢筋由φ28,mm优化为φ22,mm.
Based on the bucket foundation in an offshore wind project in the sea of Qidong,Jiangsu province,a variety of trial finite element models were established using finite element software ABAQUS to calculate the initial bucket foundation.Some key factors such as the tension control stress, the number and arrangement of prestressed duct, the number of prestressed steel bar, and the configuration of common steel bar in the structure were particularly considered to research how those impacts act on the force transmission characteristics of arc transition section, and the bearing performance of bucket foundation. According to the calculation results,the final optimal adjustment plan is that the applied effective prestress is 1,000,MPa,the number of channels remains unchanged,the number of prestressed steel bar is reduced to 10,the number of vertical reinforced bar is 60,with φ25,mm,and the hoop reinforced bar is optimized from φ28,mm to φ22,mm.
Based on the bucket foundation in an offshore wind project in the sea of Qidong,Jiangsu province,a variety of trial finite element models were established using finite element software ABAQUS to calculate the initial bucket foundation.Some key factors such as the tension control stress, the number and arrangement of prestressed duct, the number of prestressed steel bar, and the configuration of common steel bar in the structure were particularly considered to research how those impacts act on the force transmission characteristics of arc transition section, and the bearing performance of bucket foundation. According to the calculation results,the final optimal adjustment plan is that the applied effective prestress is 1,000,MPa,the number of channels remains unchanged,the number of prestressed steel bar is reduced to 10,the number of vertical reinforced bar is 60,with φ25,mm,and the hoop reinforced bar is optimized from φ28,mm to φ22,mm.
引文
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[8]Lian Jijian,Chen Fei,Wang Haijun.Laboratory tests on soil-skirt interaction and penetration resistance of suction caissons during installation in sand[J].Ocean Engineering,2014,84:1-13.
[9]Dong Xiaofeng,Lian Jijian,Yang Min,et al.Operational modal identification of offshore wind turbine structure based on modified SSI method considering harmonic interference[J].Journal of Renewable and Sustainable Energy,2014,6(3):1-29.
[10]Liu Run,Chen Guangsi,Lian Jijian,et al.Vertical bearing behaviour of the composite bucket shallow foundation of offshore wind turbines[J].Journal of Renewable and Sustainable Energy,2015,7(1):1-29.
[11]练继建,陈飞,杨旭.海上风机复合筒型基础负压沉放调平[J].天津大学学报:自然科学与工程技术版,2014,47(11):987-993.Lian Jijian,Chen Fei,Yang Xu.Suction installation and leveling of composite bucket foundation for offshore wind turbines[J].Journal of Tianjin University:Science and Technology,2014,47(11):987-993(in Chinese).
[12]窦国钦,杜修力,李亮.冲击荷载作用下钢纤维混凝土配筋梁性能试验[J].天津大学学报:自然科学与工程技术版,2015,48(10):864-873.Dou Guoqin,Du Xiuli,Li Liang.Experiment on behavior of reinforced concrete beams with steel fiber under impact load[J].Journal of Tianjin University:Science and Technology,2015,48(10):864-873(in Chinese).
[2]丁红岩,于瑞,张浦阳,等.海上风电大尺度预应力筒型基础结构预应力优化设计[J].天津大学学报,2012,45(6):473-482.Ding Hongyan,Yu Rui,Zhang Puyang,et al.Optimal design for prestress of large-scale bucket foundation for offshore wind turbine[J].Journal of Tianjin University,2012,45(6):473-482(in Chinese).
[3]Zhang Puyang,Ding Hongyan,Le Conghuan.Hydrodynamic motion of a large prestressed concrete bucket foundation for offshore wind turbines[J].Journal of Renewable and Sustainable Energy,2013,5(6):1-8.
[4]Zhang Puyang,Ding Hongyan,Bai Zhihua.Virtual reality and visual simulation technology in platform construction with four bucket foundations based on secondary development of Vega[J].Transactions of Tianjin University,2013,19(6):398-403.
[5]Lian Jijian,Ding Hongyan,Zhang Puyang.Design of large-scale prestressing bucket foundation for offshore wind turbines[J].Transactions of Tianjin University,2012,18(2):79-84.
[6]乐丛欢,丁红岩,张浦阳.分舱板对海上风机混凝土筒型基础承载模式的影响[J].工程力学,2013,30(4):429-434.Le Conghuan,Ding Hongyan,Zhang Puyang.Influence of bulkheads on the behavior mode of concrete bucket foundation for offshore wind turbine[J].Engineering Mechanics,2013,30(4):429-434(in Chinese).
[7]Yu Hao,Zeng Xiangwu,Neff F H,et al.Centrifuge modeling of offshore wind foundations under earthquake loading[J].Soil Dynamics and Earthquake Engineering,2015,77:402-415
[8]Lian Jijian,Chen Fei,Wang Haijun.Laboratory tests on soil-skirt interaction and penetration resistance of suction caissons during installation in sand[J].Ocean Engineering,2014,84:1-13.
[9]Dong Xiaofeng,Lian Jijian,Yang Min,et al.Operational modal identification of offshore wind turbine structure based on modified SSI method considering harmonic interference[J].Journal of Renewable and Sustainable Energy,2014,6(3):1-29.
[10]Liu Run,Chen Guangsi,Lian Jijian,et al.Vertical bearing behaviour of the composite bucket shallow foundation of offshore wind turbines[J].Journal of Renewable and Sustainable Energy,2015,7(1):1-29.
[11]练继建,陈飞,杨旭.海上风机复合筒型基础负压沉放调平[J].天津大学学报:自然科学与工程技术版,2014,47(11):987-993.Lian Jijian,Chen Fei,Yang Xu.Suction installation and leveling of composite bucket foundation for offshore wind turbines[J].Journal of Tianjin University:Science and Technology,2014,47(11):987-993(in Chinese).
[12]窦国钦,杜修力,李亮.冲击荷载作用下钢纤维混凝土配筋梁性能试验[J].天津大学学报:自然科学与工程技术版,2015,48(10):864-873.Dou Guoqin,Du Xiuli,Li Liang.Experiment on behavior of reinforced concrete beams with steel fiber under impact load[J].Journal of Tianjin University:Science and Technology,2015,48(10):864-873(in Chinese).