ABSTRACT

In view of the development of heavy timber seismic-resistant structures, in the context of modern seismic design approach, a possible solution is to allow the timber structure to dissipate a part of the seismic energy. Since timber is a material with an elastic-fragile behaviour, the dissipative function should be delegated to connections, through plastic deformation of steel connectors. However, joints are primary structural elements, with a crucial role in bearing the design loads. Therefore, the role of seismic energy dissipation should be conveniently assumed by ad hoc devices.

In this context, the paper deals with the application of fluid viscous dampers (FVD) to timber frames: FVDs dissipate seismic energy, while timber elements and steel connections remain elastic. Specifically, 2D single-storey structures with dissipative bracing systems, equipped with FVDs, in different configurations, are studied, assuming several rates of possible dampings. Non-linear dynamic time history analyses are performed (SAP2000, v18). Results are discussed showing significant reduction of the structural mass compared to the non-dissipative ones, recentering capability of the structures, high dissipative capacity, simpler elastic connections. The reduction of production and maintenance costs follows. All these involve the efficiency of the structural performance and sustainability under earthquakes.

抽象的

考虑到重型木材抗震结构的发展，在现代地震设计方法的背景下，一种可能的解决方案是允许木材结构耗散一部分地震能量。由于木材是一种具有弹性易碎特性的材料，因此应通过钢连接器的塑性变形将耗散功能委托给连接。但是，接头是主要的结构元素，在承受设计载荷方面起着至关重要的作用。因此，ad hoc设备应方便地承担地震耗能的作用。

在这种情况下，本文讨论了流体粘性阻尼器（FVD）在木构架上的应用：FVD消散了地震能量，而木构元素和钢连接仍保持弹性。具体来说，假设可能的阻尼率有几种，则研究带有耗散支撑系统且配备FVD的2D单层结构的不同配置。进行非线性动态时程分析（SAP2000，v18）。讨论的结果表明，与非耗散结构相比，结构质量显着减少，结构的中心化能力，高耗散能力，更简单的弹性连接。随后降低了生产和维护成本。所有这些都涉及地震作用下结构性能的效率和可持续性。