带地下室或裙房高层建筑抗浮锚杆整体计算方法

Integral calculation method of anti-floating anchor of high-rise building with basement or podium

对于带地下室或裙房的高层建筑,抗浮设计是重要的。现常用抗浮锚杆设计方法不能考虑锚杆受力的不均匀性。建立包含锚杆、基础和上部结构的整体有限元模型来进行抗浮计算,整体抗浮计算结果表明,锚杆和底板的变形和受力是相互影响的;锚杆的实际承载力可能明显大于按现常用方法设计的结果,而实际所需锚杆数量少于按现常用方法设计的结果。给出了整体模型中锚杆刚度的计算方法。

For high-rise building with basement or podium, anti-floating design is important. Current design method of anti-floating anchor takes no account of stress nonuniformity of the anchor. An integral FEM model, which contains the anchors, foundation and the upper structure, was established to carry out anti-floating calculation. The integral anti-floating calculation results show that the deformation and stress of the anchors and the base slab influence each other. Compared with the design result with the current method, the actual bearing capacity of the anchors are larger. Numbers of needed anchors in actual is less than that from results with current method. The calculation method to calculate the anchor stiffness in the integral model was provided.