Shear in RC-slabs under concentrated loads close to support

靠近支撑的集中荷载作用下 RC 板的剪力

• 批准号: 277476255
• 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
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/277476255?language=en
• 关键词: Shear; RC; slabs; under; concentrated

The load transfer mechanism of concentrated forces close to the support of reinforced concrete slabs (e.g. column loads, wheel loads on bridge decks) is not known with sufficient accuracy, as by many research papers on this subject demonstrate. Significant part of the concentrated forces can be transferred directly to the support by compression struts. This part of the load must not be considered in the shear design of the slab, as many experiments with RC beams have shown. This well known effect can not be transferred directly to a slab as the spatial structural shows a 2-dimensional load transfer. First investigations have shown that the direct load transfer mechanism in slabs may be even higher than in beams. Within this research project the transfer of concentrated loads in slabs close to the support will be investigated by experiments and numerical simulations. More fundamental knowledge and reliable design approaches are expected as an outcome or the work. This is urgently needed for existing structures as they often show a lack of shear reinforcement as well as for new ones to avoid the costly arrangement of stirrups.

关于钢筋混凝土板支承的集中荷载传递机理(如桥面上的柱荷载、轮载等)，目前还不是很清楚，许多研究论文都证明了这一点。很大一部分集中力可以通过压杆直接传递到支座上。正如许多钢筋混凝土梁试验所表明的那样，在板的抗剪设计中不能考虑这一部分荷载。这种众所周知的效应不能直接传递到板上，因为空间结构表现为二维荷载传递。首先，研究表明，板的直接荷载传递机制可能比梁的更高。在本研究项目中，将通过试验和数值模拟来研究集中荷载在靠近支座的板中的传递。更多的基础知识和可靠的设计方法有望成为成果或工作。对于现有的结构，这是迫切需要的，因为它们经常显示出缺乏抗剪钢筋，以及对于新的结构，以避免昂贵的箍筋布置。

项目成果

Querkrafttragfähigkeit von Stahlbetonplatten ohne Querkraftbewehrung unter konzentrierten Einzellasten

无抗剪钢筋的钢筋混凝土板在集中单独荷载下的抗剪承载力

• DOI: 10.1002/best.201700040
• 发表时间: 2017
• 期刊: Beton‐ und Stahlbetonbau
• 作者: G. Rombach;L. Henze
• 通讯作者: L. Henze