单向板在线荷载作用下的次方向弯矩与配筋分析

Analysis of the Secondary-direction Moment and Reinforcement for One-way Slab under Line Load

单向板在线荷载作用下,在次方向会产生较大的弯矩,设计中容易对次方向上的弯矩估计不足从而造成结构破坏。采用弹性理论和有限元ANSYS软件对单向板在线荷载作用下的次方向弯矩进行了分析计算,并进行配筋设计,分析结果表明,线荷载作用下,次方向弯矩与主方向弯矩量级相当,给出了单向板次方向弯矩的计算方法,并对此提出了两种可行的设计建议:一是在次方向分布钢筋的基础上,在板底布置附加短钢筋;二是在线荷载下增加一定宽度的垫层。

One-way slab subjected to the line load may result in a big bending moment in the secondary direction. The secondary-direction moment is easily underestimated so that a structural failure might occur. In this paper, the moment in the secondary direction for one-way slab under line load is analyzed by elastic theory and the ANSYS Code, and the corresponding reinforcement is calculated. The results show that the moment in the secondary direction has the same order of magnitude with the moment in the primary direction. The calculation method of the moment in the secondary direction of one-way slab is presented. Two feasible design suggestions are proposed. One is adding the short reinforcements in the secondary direction at the bottom of slab based on the distributing reinforcements, the other is to add a certain width of cushion under the line load.