Structural behavior of reinforced concrete slabs subjected to uniform and concentrated loads

集中荷载作用下无箍筋钢筋混凝土板的受力性能是国内外研究和实践的热点。特别是，板在作用区是局部破坏，即冲切，还是作为正常的剪切破坏，还没有得到澄清。在大多数钢筋混凝土板的试验研究中，集中荷载位于靠近支座的位置，因为假定该区域发生破坏。然而，申请人作为DFG资助的一个研究项目的一部分进行的一系列试验表明，剪切破坏发生在靠近荷载应用的地方，这与通常的观点相矛盾。开发的新设计方法已被纳入德国的一项法规。然而，一些问题仍然没有得到回答。例如，抗弯配筋对承载能力的影响还没有得到充分的试验验证。在上述研究项目中，加固程度从ρ_L=1.16%降低到ρ_L=0.71%，破坏荷载变化不大。在不同的分析方法中，钢筋对承载性能的影响有不同的处理方法。在实际楼板中，集中荷载总是与均布荷载共同作用。附加均布荷载和线荷载对钢筋混凝土板承载性能的影响有待研究。针对这两个课题进行了钢筋混凝土悬臂板的大型试验和数值分析。

The load-bearing behavior of reinforced concrete slabs without stirrups subjected to concentrated loads is of national and international interest for research and practice. In particular, it has not yet been clarified whether a slab fails locally in the area of action, i.e. punching, or as a normal shear failure. Depending on this, the influence of a uniform load has to be clarified.In most experimental investigations of reinforced concrete slabs, the concentrated load was located close to the support, as failure was assumed to occur in this region. However, a series of experiments carried out by the applicant as part of a research project funded by the DFG showed that the shear failure occurs close to the load application, which contradicts the common opinion. The developed new design approach has been included in a German regulation. However, some questions remain unanswered. For example, the influence of the flexural reinforcement on the load-bearing capacity has not yet been sufficiently experimentally verified. In the aforementioned research project, the degree of reinforcement was reduced from ρ_l = 1,16 % to ρ_l = 0,71 % in one experiment, whereby the failure loads hardly changed. The influence of the reinforcement on the load-bearing behaviour is treated differently in various analytical approaches. In a real slab, concentrated loads always act together with uniform loads. The influence of additional uniform and line loads on the load-bearing behaviour of reinforced concrete slabs is to be investigated. Large-scale tests on cantilevered reinforced concrete slabs and numerical analyses are conducted for both topics.