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水平荷载作用下装配式风机基础受力性状研究

Study on the behavior of prefabricated wind turbine foundation under lateral load
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摘要 装配式风机基础作为一种新型基础形式,具有环保、节能及高效等优势。但其能否在水平荷载作用下保持足够的刚度与承载力仍鲜有研究。本研究运用有限元计算与理论分析相结合的方法,探究了装配式风机基础的水平受力性状。研究结果表明:水平荷载作用下,装配式基础变形特征类似于埋入式筒型基础,且与现浇基础相比,装配式混凝土基础的受力状况并未变差。装配式风机基础在较低荷载作用下,前侧土体主要发生弹性变形,土压力分布呈近似线性减小;在较大加载条件下,前侧土体屈服,土压力先增大后减小。通过理论分析验算了装配件薄弱接触面间的抗剪性能,结果表明,充足的预应力可以使装配式基础具备足够的抗剪强度。最后利用极限平衡法,通过理论推导,求解出基础水平承载力理论值,并与有限元结果对比,二者基本一致,表明了水平承载理论分析方法的正确性。 As a new type, the prefabricated wind turbine foundation is advanced with eco-friendly, energy-reservation and high efficiency, but there are few researches whether the prefabricated wind turbine foundation is adequate on stiffness and capacity under lateral load. The behavior of the prefabricated wind turbine foundation under lateral force is studied in this paper by FEM and theoretical analysis. The results show that the deformation behavior of prefabricated foundation under the lateral load is similar to the embedded bucket foundation. Comparing with the cast-in-situ concrete foundation, the stress state of prefabricated concrete foundation did not become worse. The front soil pressure of the foundation shows an approximate linear decrease with depth when the lateral load is low, and the deformation of soil is mostly elastic. The front soil pressure increase first and then decrease when the load is high, which means the soil has reached yield limit. Basing on theoretical analysis, the shear performance of the contact surfaces between adjacent prefabricated blocks was checked, and the results show that the shear capacity of prefabricated foundation could be obtained by sufficient prestress applied. Finally, the theoretical values of ultimate bearing capacity under the lateral load is determined according to theoretical deduction of limit equilibrium method, and the results of theoretical calculation are turned out to be correct comparing with the results from FEM.
作者 汤友生 姚海林 卢正 佘剑波 Tang Yousheng;Yao Hailin;Lu Zheng;She Jianbo(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;China United Engineering Corporation Limited,Hangzhou 310052,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处 《工程勘察》 2019年第3期1-8,共8页 Geotechnical Investigation & Surveying
基金 国家自然科学基金项目(No.41472286,No.41472290,No.41672312) 中国科学院青年创新促进会资助 湖北省杰出青年基金项目(No.2017CFA056).
关键词 风机基础 装配式 有限元 理论分析 水平承载力 wind turbine foundation prefabricated FEM theoretical analysis lateral bearing capacity
作者简介 汤友生(1992-),男(汉族),安徽蚌埠人,硕士研究生;通讯作者:卢正(1982-),男(汉族),湖北房县人,研究员,博士生导师.
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