地下室底板平面外刚度对抗浮锚杆设计的影响

Influence of Out of Plane Stiffness of Basement Floor on Anti Floating Anchor Rod Design

采用有限元方法对不同跨厚比的底板与抗浮锚杆的协同作用进行分析,揭示出抗浮锚杆设计与基础形式是独立柱基加抗水底板还是筏板无关,而与底板平面外刚度有直接关系。底板越厚,跨厚比越小,底板以上建筑结构自重与锚杆协同抵抗浮力的有利作用越大,不同区域锚杆的上拔力差值越小。

The finite element method is used to analyze the synergistic effect between the bottom plate and the anti floating anchor rod with different span thickness ratio.It is revealed that the design of anti floating anchor rod has nothing to do with whether the foundation form is independent column foundation plus water resisting floor or raft,but is directly related to the out of plane stiffness of the base plate.The thicker the base plate is,the smaller the span thickness ratio is,the greater the beneficial effect of the self weight of the building structure above the floor and the synergistic resistance of the anchor rod to the buoyancy,and the smaller the difference of the uplift force of the anchor rod in different regions.