当上部结构刚度较大（如剪力墙体系、填充墙很多的框架体系），且地基压缩模量≤4MPa时，筏基的地基反力可按直线分布考虑；如果上部结构的荷载是比较均匀的，则地基反力也可取均匀反力。对筏板厚度大于（为承重横向剪力墙开间或最大柱距）的筏板，且上部结构刚度较大时，筏基下的地基反力仍可按直线分布确定；当上部结构荷载比较均匀时，筏基反力夜可视为均匀的。为了考虑整体弯曲的影响，在板端一、二开间内的地基反力应比均匀反力增加10%～20%。若不满足上述条件，则只能按弹性板法来确定地基反力。
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