钢筋混凝土单筋梁的斜向受弯正截面承载力

根据GB50010—2002《混凝土结构设计规范》规定的单向受弯构件正截面承载力计算方法确定梁的单向受弯正截面承载力.利用该规范附录F的原理编制计算程序,计算截面高宽比1～4、斜弯角90~0范围内,配筋率分别约为最大配筋率、最小配筋率和经济配筋率时双向受弯构件的正截面承载力,从而得出了各种条件下正截面承载力较单向受弯降低不大于5%时外荷载的最大允许斜弯角maxb.最后得出maxb随着截面高宽比和配筋率增大而减小等几条结论.

Normal Section Bearing Capacity of Rectangular Concrete Beam with Tension Reinforcement only under Inclined Bending

According to GB50010-2002 Code for design of concrete structures, the normal section bearing capacity of reinforced concrete beam subjected to single bending is determined. The calculation program is established from the appendix F of GB50010-2002 Code for design of concrete structures. The normal section bearing capacity of reinforced concrete beam, which subjected to inclined bending under the cross section depth-width ratio at the range of 1 to 4, the load inclination at 0 to 90 degree, the tension reinforcement ratio at minrto maxr, is obtained by the program. Therefore the maximum limit load inclinations maxbare derived of which the bearing capacity declined does not exceed 5% under various conditions. Finally several conclusions, such as the maxb are decreased with the increase of the ratio of depth to width and the ratio of tension reinforcement of the cross section, are reached.