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钢筋混凝土矩形截面单跨等截面梁,纵向钢筋按最大弯矩计算就可以了。但对坡梁来说,最大弯矩截面不一定是危险截面,如在均布荷载作用下单跨双坡梁,危险截面不在弯矩最大的跨中。因此,对于坡梁的计算,应首先求出危险截面位置,纵向钢筋应按此截面计算。一、矩形载面单跨双坡梁在均布荷载作用下截面的精确计算法双坡梁在均布荷载作用下如图l所示,距支座A为x截面的弯矩可表示为:
For a single-span beam with rectangular cross section of reinforced concrete, the longitudinal reinforcement is calculated according to the maximum bending moment. However, for a girder, the maximum bending moment section is not necessarily a dangerous section. For example, under single-span double-slope beam under uniform load, the dangerous section is not in the middle of the bending moment. Therefore, for the calculation of the slope beam, the location of the dangerous section should first be determined, and the longitudinal reinforcement should be calculated according to this section. An accurate calculation method for the cross section of double-slope girder under single-span loading under uniform load. The double-slope girder under uniform load is shown in Figure 1, and the bending moment from bearing A to x cross-section can be expressed as: