Marcon Marco, Ninčević Krešimir, Boumakis Ioannis, Czernuschka Lisa-Marie, Wan-Wendner Roman
Christian Doppler Laboratory LiCRoFast, Department of Civil Engineering and Natural Hazards, University of Natural Resources and Life Sciences (BOKU), 1190 Vienna, Austria.
Materials (Basel). 2018 May 1;11(5):711. doi: 10.3390/ma11050711.
In the last decades, fastening systems have become an essential part of the construction industry. Post-installed mechanical anchors are frequently used in concrete members to connect them with other load bearing structural members, or to attach appliances. Their performance is limited by the concrete related failure modes which are highly influenced by the concrete mix design. This paper aims at investigating the effect that different aggregates used in the concrete mix have on the capacity of an undercut anchor under tensile quasi-static loading. Three concrete batches were cast utilising three different aggregate types. For two concrete ages (28 and 70 days), anchor tensile capacity and concrete properties were obtained. Concrete compressive strength, fracture energy and elastic modulus are used to normalize and compare the undercut anchor concrete tensile capacity employing some of the most widely used prediction models. For a more insightful comparison, a statistical method that yields also scatter information is introduced. Finally, the height and shape of the concrete cones are compared by highly precise and objective photogrammetric means.
在过去几十年中，紧固系统已成为建筑行业的重要组成部分。后置机械锚固件常用于混凝土构件中，将其与其他承重结构构件连接，或安装器具。其性能受混凝土相关破坏模式的限制，而这些破坏模式受混凝土配合比设计的影响很大。本文旨在研究混凝土配合比中使用的不同骨料对扩孔型锚固件在拉伸准静态加载下承载力的影响。使用三种不同类型的骨料浇筑了三批混凝土。对于两个混凝土龄期（28天和70天），获取了锚固件的抗拉承载力和混凝土性能。采用一些最广泛使用的预测模型，利用混凝土抗压强度、断裂能和弹性模量对扩孔型锚固件的混凝土抗拉承载力进行归一化和比较。为了进行更有深度的比较，引入了一种能产生离散信息的统计方法。最后，通过高精度和客观的摄影测量方法比较混凝土锥体的高度和形状。
