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.

没有压力的钢筋混凝土板的承重行为对研究和实践具有国内和国际利益。特别是，尚未澄清板在动作区域，即打孔还是正常的剪切故障。根据这一点，必须阐明均匀负载的影响。在大多数实验研究钢筋混凝土板的实验研究中，集中载荷位于支撑物附近，因为假定在该区域发生故障。但是，作为DFG资助的研究项目的一部分，应用程序进行的一系列实验表明，剪切故障发生在接近负载应用程序附近，这与共同意见相矛盾。开发的新设计方法已包括在德国法规中。但是，有些问题仍未得到解答。例如，柔性加固对承重能力的影响尚未得到充分的实验验证。在后来的关系研究项目中，在一个实验中，加固程度从ρ_l= 1,16％降低到ρ_l= 0,71％，从而使故障负载几乎不变。在各种分析方法中，强化对承重行为的影响都不同。在真实的平板中，集中载荷总是与均匀的载荷一起起作用。还需要研究其他均匀载荷对钢筋混凝土板的承重行为的影响。对两个主题进行了悬臂钢筋混凝土板和数值分析的大规模测试。