第四章静定的预应力鋼筋混凝土結构由于混凝土徐变及收缩引起的变形的計算混凝土徐变及收縮,使結构产生变形,这种变形既有由于混凝土本身的塑性变形所引起的,也有由于它們所产生的鋼筋混凝土杆件中应力状态的改变所引起的。既然钢筋混凝土杆件截面中由于混凝土徐变及收縮引起的应力状态的改变可以用代替柱法来决定,那么这时产生的变形同样可以用相同方法計算出来。在鋼筋混凝土杆件截面中由于混凝土徐变及收缩影响产生的相对角变位(弯曲)γc,可用代替柱重心处的相应变形ε_1及ε_2按下式計算: Chapter IV Static Prestressed Reinforced Concrete Structure Calculation of Deformation Caused by Creep and Shrinkage of Concrete Creep and shrinkage of concrete causes the structure to deform both due to the plastic deformation of the concrete itself and also due to The resulting changes in the state of stress in the reinforced concrete members they cause. Since the change of the stress state due to the creep and shrinkage of concrete in the section of reinforced concrete members can be determined by the method of substituting columns, the deformation at this time can also be calculated in the same way. The relative angular displacement (bending) γc due to the influence of concrete creep and shrinkage in the section of reinforced concrete members can be calculated by using the corresponding deformations ε_1 and ε_2 instead of the center of gravity of the column as follows: