复杂荷载条件下钢管插入式基础受力性能分析  

Mechanical Behavior of Steeling Plug-in Foundation under Difficult Loading Condition

作　　者：高志林[1] 但汉波[1] 邢月龙[1] 黄永林[1] 

机构地区：[1]浙江省电力设计院,杭州市310012

出　　处：《电力建设》2011年第9期19-23,共5页Electric Power Construction

基　　金：国家电网公司科技项目(舟山与大陆联网海上大跨越关键技术研究与实施)

摘　　要：结合220kV舟山与大陆联网跨越工程中螺头水道特大跨越段的工程实践,针对岛上基础荷载和地形地质条件复杂的特点,采用有限元数值计算方法,考虑岩石基础-锚桩-基础周边岩层的共同作用,分析了特大荷载条件下钢管插入式基础的受力性能。偏心荷载作用下,钢管插入式基础的基底应力呈梯形分布而非马鞍形;通过在立柱中部设置双向连梁,可有效改善基础偏心受力和不均匀变形状况。插入钢管外设置锚板可有效传递基础的上拔荷载,同时通过调整立柱配筋也可有效控制基础混凝土裂缝开展范围。对于内置锚固件的钢管插入式基础,其在复杂荷载条件下的受力性能及设计控制措施值得进一步深入研究。Based on the practical experience of Luotou water channel super large-crossing in 220 kV Zhoushan-mainland electric power grid project, the mechanical behavior of huge steeling plugin foundation under difficult loading and geological conditions is analyzed by using finite element method, which considers the nonlinear properties of concrete and the interaction between foundation, anchors and rock. Under eccentric loads, the base resistance of foundation is distributed in trapezoid shapes. The eccentric stress states and uneven settlements of foundation can be improved by applying two-sided linking beams in the middle of column. The uplift loads can be effectively transferred by internal anchor plates, and the scope of cracks in concrete can be prevented by some adjustments on the reinforcements. Some attention, which must be further paid on the design of steeling plug-in foundation, has also been discussed.

关 键 词：大跨越输电线路 钢管插入式基础 受力性能 非线性有限元法 

分 类 号：TM75[电气工程—电力系统及自动化]