集中荷载下钢筋混凝土简支板双向受力性能分析

由于在钢筋混凝土简支板中，中置集中荷载作用下的双向弯曲很明显，特别是当板的宽跨比较大，集中荷载面积较小时，其双向作用更为明显，按常规设计往往只计算Mx方向配筋，而My方向则按构造配筋，工程上经常出现沿板跨度方向的裂缝，即板的纵缝，并且由于My方向配筋过少，板纵向裂缝的宽度远大于横向裂缝的宽度，因此在试验研究的基础上，分析了中置信中荷载作用下板的双向作用，并根据塑性铰线法及简化的计算模型，提出了控制板纵缝的My计算方法，可供工程设计参考。

An analysis of biaxial bending of reinforced concrete slabs with simply support under concentrated loads

In the reinforced concrete slab with simply support, the biaxial bending effect under concentrated loads acting on the center of width is obvious, especially on the slabs with larger width to length ratio or smaller loading areas. According to the conventional design method, the longitudinal reinforcement is calculated according to M x , but the transverse reinforcement is given according to the minimum ratio of reinforcement. Therefore, the phenomenon of cracking extended along the span of slab (longitudinal crack of slab) commonly appears in construction and the width of the crack along longitudinal direction is far greater than that along transverse direction which is caused by the less transverse reinforcement. Based on the experimental research, the biaxial bending effect of reinforced concrete slabs under the concentrated loads is analyzed. For the calculation of M y that controls the longitudinal crack of slab, the formula based on the theory of plastic hinge line is deduced and the simplified calculating method is given which provides a reference for engineering design.