Measuring strain and stress distributions along rebar embedded in concrete using time-of-flight neutron diffraction
Measuring strain and stress distributions along rebar embedded in concrete using time-of-flight neutron diffraction
复制标题
使用飞行时间中子衍射测量沿嵌入混凝土中的钢筋的应变和应力分布
DOI：
10.1088/0957-0233/25/2/025602
复制
发表时间：
2014
影响因子：
2.4
通讯作者：
S. Harjo
中科院分区：
文献类型：
--
作者：
H. Suzuki;K. Kusunoki;Y. Hatanaka;T. Mukai;A. Tasai;M. Kanematsu;K. Kabayama;S. Harjo
在现代社会中，建筑和土木工程结构，如钢筋混凝土建筑物，需要高抗震性能，以尽量减少城市地震灾害暴露的“巨风险”。在钢筋混凝土结构中，钢筋与混凝土之间的粘结抗力是讨论其性能的一个重要参数，通常通过测量沿预埋钢筋沿着方向的应变分布来评价。在这里，我们提出了在现场应变和应力测量钢筋混凝土中使用飞行时间中子衍射作为一种新的替代技术，以典型的应变计。在这项研究中，它被证明是在正常强度的混凝土，在空气中固化的嵌入式钢筋的三维变形行为，可以准确地测量拔出荷载下使用飞行时间中子衍射。中子衍射在结构工程领域中的广泛应用，有望进一步了解钢筋混凝土结构的实际现象。
In modern society, architectural and civil engineering structures such as reinforced concrete buildings require high seismic performance to minimize the ‘megarisk’ exposed from urban earthquake hazards. In the reinforced concrete structures, the bond resistance between rebar and concrete is one important parameter for discussing its performance and it has been typically evaluated by measuring the strain distribution along the embedded rebar. Here, we present in-situ strain and stress measurements for the rebar in reinforced concrete using time-of-flight neutron diffraction as a novel alternative technique to typical strain gauges. It was demonstrated in this study that the three-dimensional deformation behavior of the embedded rebar in normal-strength concrete, cured in air, can be accurately measured under pull-out loading using time-of-flight neutron diffraction. Wider applications of neutron diffraction in the structural engineering field are expected for advanced understanding of actual phenomena on reinforced concrete structures.