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为简化基础底板形状不规则时的地基沉降计算,通过分析荷载区域几何形状对地基中附加应力的影响,提出以等效矩形替代原不规则荷载区域的等效矩形法。分析结果表明,均布荷载作用下,荷载区域总面积相同,且荷载强度相同时,若荷载区域几何形状不同,则在各自的最大沉降计算点下深度约为槡A/2处,地基中附加应力之间的差别最大,同时矩形中心点下该深度处的附加应力系数随着矩形圆形度的增加而增大。利用这一原理,对Newmark感应图法加以改进,提出3D-Newmark感应图法,以确定等效矩形的具体几何尺寸。
In order to simplify the foundation settlement calculation when the irregular shape of the foundation slab is irregular, an equivalent rectangular method of replacing the original irregular load area with an equivalent rectangle is proposed by analyzing the influence of the load area geometry on the additional stress in the foundation. The results show that under uniform load, when the total area of load zone is the same and the load intensity is the same, if the load zone geometry is different, the depth under the maximum settlement calculation point is about 槡 A / 2, The difference between the stresses is maximized, while the additional stress coefficient at that depth at the center of the rectangle increases with increasing circularity of the rectangle. Using this principle, the Newmark induction method is improved and the 3D-Newmark induction method is proposed to determine the exact geometric size of the equivalent rectangle.