钢筋混凝土受弯构件的截面计算,一般是先按正截面(抗弯)强度计算配筋,然后进行变形验算以及抗裂度或裂缝宽度的验算。承受往复荷载的受弯构件,还需作一次疲劳验算。因此,需反复进行计算,并经多次修改才能最后通过,而计算结果却未必合理。对于截面高度受限制,而刚度、抗裂度或疲劳强度要求较高者,即非强度控制的受弯构件,尤其如此。因为这类构件抗弯强度 The calculation of the section of a reinforced concrete flexural member is generally based on the calculation of the strength of the normal section (bending) strength, and then the calculation of the deformation check and the calculation of crack resistance or crack width. For a flexural member subjected to a reciprocating load, a fatigue check is also required. Therefore, calculations must be repeated and final modifications must be made after many modifications, but the calculation results may not be reasonable. This is especially true for those sections where the height of the section is limited and where the stiffness, crack resistance, or fatigue strength requirements are higher, ie non-strengthally controlled bending members. Because of the bending strength of these components