Numerical modelling of anchor bolts under pullout and relaxation tests
Numerical modelling of anchor bolts under pullout and relaxation tests
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DOI：
10.1016/j.conbuildmat.2009.12.015
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发表时间：
2010-07
影响因子：
7.4
通讯作者：
F. Delhomme;G. Debicki
中科院分区：
文献类型：
--
作者：
F. Delhomme;G. Debicki
在钢筋混凝土基础中的结构元件的锚固通常通过现浇锚来执行。它们的主要功能是根据传递到结构基础的力来传递法向载荷、拉伸和压缩以及可能的剪切载荷。本研究仅限于研究末端带有锚垫圈的长而光滑的锚杆，该杆嵌入混凝土中。锚杆被预加应力，以尽量减少疲劳的影响。在设计这些锚杆的正常实践中，虽然混凝土徐变涉及初始预应力水平的降低，但并不考虑混凝土的长期性能。本文介绍了拉拔和松弛试验的实验结果和有限元模拟的节点。在使用欧洲规范2中给出的徐变定律进行粘弹性分析时，考虑了混凝土的时间相关行为。数值计算结果与实验测量结果一致。预应力的减小被正确地模拟，并且其随时间的演变可以被估计。
The anchoring of structure elements in a reinforced concrete foundation is often performed by means of cast-in-place anchors. Their main function is to transfer normal loads, tension and compression, and possible shear loads according to the force transferred to the base of the structure. This study is limited to the study of long and smooth anchor rods with an anchor washer on the end, embedded in concrete. The anchor rods are prestressed in order to minimize the effects of fatigue. In normal practice to design these anchors the long-term behaviour of concrete is not taken into account although concrete creep involves a decrease in the initial prestress level. This paper presents the experimental results of pullout and relaxation tests and a finite element modelling of the joint. The time-dependent behaviour of concrete is taken into account in a visco-elastic analysis using the creep laws given in Eurocode 2. The numerical results are coherent with the measurements obtained in experimental tests. The decrease in the prestress is correctly simulated and its evolution in time can be estimated.