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Compressive strength of masonry

砌体抗压强度

基本信息

批准号：
233139939
负责人：
Professor Dr.-Ing. Wolfgang Brameshuber (†)
金额：
--
依托单位：
Lehrstuhl für Baustoffkunde und Institut für Bauforschung (ibac)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/233139939?language=en
关键词：
Compressive strength masonry

项目摘要

Masonry constructions can be loaded by compression, tension and shear. In particular in case of compression load, as a composite material of masonry unit and mortar, masonry shows its capability. The prediction of the masonry compressive strength is usually carried out empirically or by means of appropriate mechanical models. Because of the widely varying relevant parameters of masonry units (geometry, hole content, material), mortar properties (density, Poisson's ratio, strength) and the influence of the water absorbing characteristics of the units, a precise prediction is only possible in individual cases. In consequence of the large number of main influencing parameters, a parameter space is spanned, which can not be systematically covered only by experimental studies. Within the scope of this research project, however, a sufficient number of experiments is to be conducted in order to develop and to vaildate a model to predict the compressive strength of masonry. In order to be able to capture other unit-mortar combinations economically, the experimental investigations are supported by FE-modeling. With this work, an engineering model shall be developed, which, until the initial crack formation, is based on the fracture model of Hilsdorf and shall be expanded to include a proportion of non-linearity up to the compressive strength. In the end, the research project shall result in a new concept to calculate the masonry compressive strength, which allows a much more realistic and also more economic assessment of the bearing capacity under compressive load.

砌体结构可以承受压缩、拉伸和剪切载荷。特别是在受压荷载作用下，砌体作为砌体单元和砂浆的复合材料，表现出了它的能力。砌体抗压强度的预测通常是根据经验或通过适当的力学模型进行的。由于砌体单元的相关参数（几何形状、孔含量、材料）、砂浆性能（密度、泊松比、强度）以及单元吸水特性的影响变化很大，因此只能在个别情况下进行精确预测。由于主要影响参数的数量众多，因此参数空间是跨越的，仅通过实验研究不能系统地覆盖。然而，在本研究项目的范围内，要进行足够数量的实验，以开发和验证一个模型来预测砌体的抗压强度。为了能够经济地捕获其他单元砂浆组合，实验研究由FE建模支持。通过这项工作，应开发一个工程模型，该模型在初始裂纹形成之前基于Hilsdorf断裂模型，并应扩展到包括一定比例的非线性抗压强度。最后，研究项目将导致一个新的概念来计算砌体抗压强度，这使得更现实，也更经济的评估承载能力下的压缩负载。