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按照规范(TJ 10—74)规定,钢筋混凝土梁应由正截面强度计算确定纵向钢筋数量,并须检验截面的混凝土受压区高度与有效高度之比(压高比)不大干O.55。等截面梁的正截面强度计算与截面压高比检验均在最大弯矩截面处进行。而对于坡形梁,因截面高度和弯矩沿梁长均在变化,“最大配筋截面”位置与“最大压高比截面”位置一般不相重合。因此,计算时要分别两种危险截面来控制。
According to the specification (TJ 10-74), the reinforced concrete beam should be calculated from the strength of the normal section to determine the number of longitudinal reinforcement, and the ratio of the height of the compression zone of the concrete to the effective height (pressure-height ratio) must be checked. O.55 . The calculation of the normal section strength of the section beam and the section pressure height ratio test are performed at the maximum bending moment section. For a sloped beam, the position of the “maximum reinforcement section” does not generally coincide with the position of the “maximum pressure-to-height ratio section” because the section height and the bending moment vary along the beam length. Therefore, the calculation must be controlled in two separate dangerous sections.