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首页> 外文期刊>Bulletin of earthquake engineering >Dissipative connections with U-shaped steel plate for braces of concentrically braced frames
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Dissipative connections with U-shaped steel plate for braces of concentrically braced frames

机译：与U形钢板的耗散连接，用于同心支撑框架的括号

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摘要

In concentrically braced frames, braces-to-adjacent member connections are suitable locations for the dissipation of seismic energy. If the implementation of dissipative connections does not compromise the global lateral stiffness of the structure, the compression braces can then be protected from buckling, while the structural ductility is increased and the action effects reduced. Furthermore, an efficient use of dissipative connections allows reducing the cost of post-earthquake interventions. In this paper, an innovative dissipative connection for braced frames is proposed, consisting of a steel plate bent to a U shape and connecting the brace to the adjacent column. In this connection, energy dissipation is obtained through the inelastic flexural deformation that takes place in the plate. This paper presents experimental results on the isolated U-connection and on single-storey concentrically braced frame (real scale) including the U-connection. Besides considering several variations on the geometry of the U-shape plate, the tests considered both monotonic and cyclic loading. The results highlight the efficiency of the U-connection to dissipate the energy input through inelastic deformations. On the other hand, the cyclic tests show however that the connection is potentially sensitive to fatigue, as the deformation capacity is significantly reduced with repeated loading and increasing stress amplitude, requiring thus specific attention in practical design situations.
机译：在同心支撑的框架中，围绕相邻的成员连接是适当的地震能量耗散的位置。如果耗散连接的实施不损害结构的全局横向刚度，则可以保护压缩支架免受屈曲，而结构延展性增加并且动作效应减少。此外，有效地使用耗散连接，允许降低地震干预的成本。在本文中，提出了一种用于支撑框架的创新耗散连接，由弯曲到U形并将支架连接到相邻柱的钢板组成。在这方面，通过在板中发生的无弹性弯曲变形获得能量耗散。本文介绍了隔离式U连接和单层同心支撑框架（实际规模）上的实验结果，包括U形连接。除了考虑U形板的几何形状的几个变化之外，测试认为是单调和循环负载。结果突出了U型连接的效率，以通过无弹性变形来消散能量输入。另一方面，循环试验表明，连接对疲劳可能敏感，随着变形容量随着重复的负载和增加的应力幅度而显着降低，需要如此在实际设计情况下特别注意。

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