For any load the function from load is in multiplication shear force by antisymmetry load.
任意荷载的作用含反对称荷载分量的图乘剪力的作用。
Under the normal water load, nearly all cracks are in the pressure- shear condition;
正常荷载下，裂缝基本全部处于压剪状态，不存在或存在很小的拉应力；
Under the normal water load, nearly all cracks are in the pressure- shear condition;
正常荷载下，裂缝基本全部处于压剪状态，不存在或存在很小的拉应力；
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