Mahrenholtz Philipp, Eligehausen Rolf, Hutchinson Tara C, Hoehler Matthew S
ACI Struct J. 2016 Sep;113(5):997-1008. doi: 10.14359/51689023.
Cyclic loads are a characteristic feature of actions acting on structures and anchorages during earthquakes. For this reason, seismic qualification of post-installed concrete anchors according to the internationally recognized American Concrete Institute (ACI) standard ACI 355 is based on cyclic load tests. The protocols for these tests, however, have limited scientific basis. Therefore, in the present paper newly-developed test protocols with stepwise-increasing load amplitudes are utilized to more realistically evaluate anchor seismic performance. The study focuses on the load-displacement behavior of common anchor types installed in cracked concrete and subjected to both cyclic tension and cyclic shear actions. The results confirmed robust behavior for anchors loaded in cyclic tension even in the presence of crack widths in the anchorage material larger than currently required by ACI 355. In addition, the critical influence of low cycle fatigue on the performance of anchors loaded in cyclic shear is demonstrated.
循环荷载是地震期间作用于结构和锚固装置的作用力的一个特征。因此，根据国际认可的美国混凝土学会（ACI）标准ACI 355对后置混凝土锚栓进行抗震鉴定是基于循环荷载试验。然而，这些试验的规程科学依据有限。因此，在本文中，采用了新开发的、荷载幅值逐步增加的试验规程，以便更实际地评估锚栓的抗震性能。该研究聚焦于安装在开裂混凝土中并承受循环拉伸和循环剪切作用的常见锚栓类型的荷载-位移行为。结果证实，即使锚固材料中的裂缝宽度大于ACI 355目前要求的宽度，承受循环拉伸荷载的锚栓仍具有稳健的性能。此外，还证明了低周疲劳对承受循环剪切荷载的锚栓性能的关键影响。
