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

均匀和集中荷载作用下钢筋混凝土板的结构性能

• 批准号: 465438326
• 负责人: Professor Dr.-Ing. Günter Axel Rombach
• 金额: --
• 依托单位: Institut für Massivbau B-7
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/465438326?language=en
• 关键词: Structural; behavior; reinforced; concrete; slabs

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.

无箍筋钢筋混凝土板在集中荷载作用下的承载性能引起了国内外研究和实践的兴趣。特别是，目前尚不清楚板是否在作用区域（即冲孔）局部失效，还是正常剪切失效。据此，必须澄清均匀荷载的影响。在大多数钢筋混凝土板的实验研究中，集中荷载位于靠近支撑的位置，因为假定破坏发生在该区域。然而，作为 DFG 资助的研究项目的一部分，申请人进行的一系列实验表明，剪切破坏发生在接近荷载施加的位置，这与普遍观点相矛盾。开发的新设计方法已纳入德国法规中。然而，一些问题仍然没有答案。例如，抗弯钢筋对承载能力的影响尚未得到充分的实验验证。在上述研究项目中，在一次实验中，加固程度从 ρ_l = 1,16 % 降低到 ρ_l = 0,71 %，因此破坏载荷几乎没有变化。各种分析方法对钢筋对承载行为的影响进行了不同的处理。在真实的板中，集中载荷总是与均匀载荷一起作用。有待研究附加均匀荷载和线荷载对钢筋混凝土板承载性能的影响。这两个课题都进行了悬臂式钢筋混凝土板的大规模试验和数值分析。