风力发电塔基础环基础设计的工程算法研究
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摘要
插入式钢基础环是塔筒和基础之间常用的连接方式。由于钢基础环与混凝土基础之间变形往往不能协调一致,导致很多基础环在运行一段时间后出现了明显滑移,并在基础环T型板上方与混凝土之间产生较大空隙,甚至会出现混凝土开裂、压碎破坏的情况。针对这类问题,结合工程案例中基础环基础的特点和常见破坏形式,根据有关规范和文献,总结提出了有关基础环T型板上方混凝土局部受压承载力及抗冲切承载力、T型板上方基础环外侧混凝土抗压疲劳强度和悬挑板根部钢筋抗拉疲劳强度验算的工程算法;并通过工程案例对此工程算法进行了验证;可为同种类型基础环基础的设计提供参考。
Steel embedded-ring foundation is a common connection between tower tube and foundation. Because the deformation between steel embedded-ring foundation and concrete foundation is often inconsistent, many foundation rings slip obviously after a period of operation, and there are large voids between the top of T-shaped slab of embedded-ring and concrete, and even concrete cracking and crushing will occur. In view of these problems, combined with the characteristics and common failure modes of embedded-ring foundation in engineering cases, according to relevant codes and documents, the engineering calculation algorithm was summarized and put forward for checking the local compressive and punching shear bearing capacity of concrete above embedded-ring T-shaped slab, the compressive fatigue strength of concrete outside embedded-ring above T-shaped slab and the tensile fatigue strength of steel bar at the root of cantilever slab. The engineering case validated the engineering calculation algorithm, which could provide reference for the design of the same type of embedded-ring foundation.
Steel embedded-ring foundation is a common connection between tower tube and foundation. Because the deformation between steel embedded-ring foundation and concrete foundation is often inconsistent, many foundation rings slip obviously after a period of operation, and there are large voids between the top of T-shaped slab of embedded-ring and concrete, and even concrete cracking and crushing will occur. In view of these problems, combined with the characteristics and common failure modes of embedded-ring foundation in engineering cases, according to relevant codes and documents, the engineering calculation algorithm was summarized and put forward for checking the local compressive and punching shear bearing capacity of concrete above embedded-ring T-shaped slab, the compressive fatigue strength of concrete outside embedded-ring above T-shaped slab and the tensile fatigue strength of steel bar at the root of cantilever slab. The engineering case validated the engineering calculation algorithm, which could provide reference for the design of the same type of embedded-ring foundation.
引文
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[3] 风电机组地基基础设计规定(试行):FD 003—2007[S].北京:中国水利水电出版社,2007.
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[5] Model code 2010:first complete draft volume 2[S].Lausanne:International Federation for Structural Concrete,2010.
[6] 罗国强,鞠洪国.钢筋混凝土圆形板、环形板按极限平衡法的计算[J].湖南大学学报(自然科学版),1983,10(1):75-84.
[7] 烟囱设计规范:GB 50051—2013[S].北京:中国计划出版社,2013.