Fatigue of composite constructions with composite dowels
Fatigue of composite constructions with composite dowels
复制标题
带复合销钉的复合结构的疲劳
DOI：
10.1002/cepa.1056
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hegger
中科院分区：
文献类型：
--
作者：
Christou;Claßen;Wolters;Broschart;Hegger
近年来，复合材料销钉的应用越来越多。特别是在中小跨度桥梁领域，与其他抗剪连接件相比，复合材料销钉具有许多优点。与有头螺柱相比，在几个负载循环后，初始钢裂纹已经发生，复合销钉具有更好的抗动态负载能力，从而延长了使用寿命。组合传力杆的承载力主要体现在传力杆前混凝土的受压状态，传力杆的剪力在钢筋和混凝土之间传递。在这里，多轴压应力导致应变增加，应变在载荷循环中累积，并导致复合材料连接中相对位移的循环增长。这些相对位移存在两个应变分量，弹性应变和塑性应变。连接中的塑性应变保持恒定，即使在外部载荷释放后。这些永久位移称为非弹性滑移。由于这种非弹性滑移，静态榫钉曲线的特性可能在复合结构的寿命期间显著改变。钢和混凝土之间最初的刚性连接在使用寿命期间会退化，并且复合材料伙伴之间的内力会发生重新排列，这可能会影响结构的疲劳性能。组合连接的退化可以通过循环传力曲线来考虑，该循环传力曲线可以通过引入非弹性滑移从静态传力曲线发展而来。本文介绍了循环剪切试验的结果，其中钢与混凝土之间的非弹性滑移和钢传力杆对钢腹板的相对滑移的测量和比较。
Composite dowels are being applied increasingly over the past years. Especially in the field of small and medium span bridges, composite dowels offer many advantages in comparison to other shear connectors. In contrast to headed studs, where initial steel cracks already occur after a few load cycles, composite dowels have a better resistance against dynamic loading and thus an increased lifetime. The bearing capacity of composite dowels is mainly characterized by the compression of the multiaxial stressed concrete in front of the composite dowel, where shear forces are transferred between steel and concrete. Here, the multiaxial compressive stress leads to increasing strains, that accumulate over the load cycles and lead to a cyclic growth of relative displacements in the composite connection. These relative displacements subsist of two strain‐components, the elastic and the plastic strains. The plastic strain remains constant in the connection, even after release of external loading. These permanent displacements are called inelastic slip. Due to this inelastic slip the characteristics of the static dowel curve might change significantly over the lifetime of the composite structure. The initially rigid connection between steel and concrete degrades over the lifetime and rearrangements of internal forces between the composite partners occur, which may impact the fatigue behaviour of the construction. The degradation of the composite connection can be considered by a cyclic dowel curve, which may be developed from the static dowel curve by introducing the inelastic slip. In this paper, results of cyclic shear tests are presented, in which the inelastic slip between steel and concrete and the relative slip of the steel dowel to the steel web are measured and compared.
开裂混凝土中复合销钉肋连接件的剪切试验
影响因子：
1.8
作者：
M. Classen;J. Hegger
通讯作者：
J. Hegger
在新的立场下进行联合行动
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
Georgios Christou;M. Claßen;J. Hegger
通讯作者：
J. Hegger