ABSTRACT

Connections made with laterally loaded dowel-type fasteners are important details in timber structures. According to Eurocode 5, their load-carrying capacity can be calculated with the so-called European Yield Model (EYM) and simplified rules for the determination of slip-moduli are given. The slip modulus is given as a mean value for the serviceability limit state and a simple reduction of slip modulus in the ultimate limit state is given in addition. Despite these simple regulations, it is well known that connections with dowel-type fasteners show a considerable non-linear load-deformation behaviour with different degrees of ductility. This ductility can enable the load redistribution in complex and statically undetermined structures and allow to achieve higher capacities compared to linear elastic design. In the paper, the deformation behaviour of connections with laterally loaded dowels dowel-type fasteners is studied based on more than 750 test results of bolted connections. The parameters influencing the slip-modulus, ductility ratio, and ultimate deformation are evaluated. It is focused on the effects of these parameters and the resulting variability in deformation behaviour. Recommendations are given on how different levels of ductility and deformation capacity can be achieved in dependency of the spacing of fasteners and other geometrical parameters.

摘要

用横向加载的销钉型紧固件进行的连接是木结构中的重要细节。根据欧洲规范 5，它们的承载能力可以用所谓的欧洲屈服模型 (EYM) 计算，并给出了确定滑移模量的简化规则。滑动模量作为使用极限状态的平均值给出，另外给出了极限状态下滑动模量的简单折减。尽管有这些简单的规定，但众所周知，销钉型紧固件的连接表现出相当大的非线性载荷-变形行为，具有不同程度的延展性。与线性弹性设计相比，这种延展性可以在复杂和静态不确定的结构中重新分配负载，并允许实现更高的承载能力。在论文中，基于 750 多项螺栓连接试验结果，研究了侧向加载销钉型紧固件连接的变形行为。评估了影响滑移模量、延性比和极限变形的参数。它侧重于这些参数的影响以及由此产生的变形行为的可变性。给出了有关如何根据紧固件间距和其他几何参数实现不同水平的延展性和变形能力的建议。它侧重于这些参数的影响以及由此产生的变形行为的可变性。给出了有关如何根据紧固件间距和其他几何参数实现不同水平的延展性和变形能力的建议。它侧重于这些参数的影响以及由此产生的变形行为的可变性。给出了有关如何根据紧固件间距和其他几何参数实现不同水平的延展性和变形能力的建议。