Pull-out behaviour of threaded anchors in fibre reinforced ordinary concrete and UHPC for machine tool constructions
Pull-out behaviour of threaded anchors in fibre reinforced ordinary concrete and UHPC for machine tool constructions
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DOI：
10.1016/j.jobe.2020.101842
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发表时间：
2021-01-01
影响因子：
6.4
通讯作者：
Raupach, Michael
中科院分区：
文献类型：
--
作者：
Kalthoff, Matthias;Raupach, Michael
目前还没有足够的测试装置来描述锚在水泥混凝土中的拔出行为，用于机床结构，其特征在于对几何精度的高要求和有限的锚固空间。在本文的范围内，开发了一种新的测试装置，以检查在现实的测试条件下的水泥混凝土中的不同螺纹锚的拔出行为。采用普通混凝土和超高性能混凝土（UHPC）。除了混凝土类型的影响外，还研究了微钢纤维的加入对粘结性能的影响。此外，对选定的系列进行热处理。对三种不同类型的锚进行了试验。结果表明，钢纤维的加入改善了粘结性能，取决于混凝土的类型高达53%，是必要的，以防止混凝土爆裂。热处理导致承载能力增加22%。结果表明，不建议使用普通混凝土短埋长度和良好的粘结性能只能实现与钢纤维增强UHPC。
Currently there is no adequate test setup to describe the pull-out behaviour of anchors in cementitious concrete for machine tool constructions charac terised by high requirements for geometrical precision and limited space for anchoring. Within the scope of this paper, a novel test setup was developed to examine the pull-out behaviour of different threaded anchors in cementitious concrete under realistic testing conditions. An ordinary concrete and an ultra-high performance concrete (UHPC) were used. Apart from the influence of the type of concrete, the influence of the addition of micro steel fibres on the bond behaviour was investigated. In addition, a heat treatment was carried out on selected series. The tests were carried out on three different anchor types. The results show that the addition of steel fibres improves the bond behaviour depending on the type of concrete up to 53% and is necessary to prevent concrete blow out. A heat treatment led to an increase of 22% of the load bearing capacity. The results show that the use of ordinary concrete is not recommended for short embedment lengths and that good bonding properties can only be achieved with steel fibre reinforced UHPC.