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Retrofit of reinforced concrete frames with buckling-restrained braces

机译:带屈曲约束的钢筋混凝土框架的改造

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Damage to buildings observed in recent earthquakes suggests that many old reinforced concrete structures may be vulnerable to the effects of severe earthquakes. One suitable seismic retrofit solution is the installation of steel braces to increase the strength and ductility of a building. Steel bracings have some compelling advantages such as their comparatively low weight, their suitability for prefabrication, and the possibility of openings for utilities, access, and light. The braces are typically connected to steel frames that are fixed to the concrete structure using post-installed concrete anchors along the perimeter. However, these framed steel braces are not without some disadvantages such as heavier steel usage and greater difficulties during the installation. Therefore, braces without steel frames appear to be an attractive alternative. In this study, braces were connected to gussets furnished with anchor brackets, which were fixed by means of a few post-installed concrete anchors. The clear structural system and the increased utilization of the anchors allowed the anchorage to be designed precisely and economically. The use of buckling-restrained braces (BRBs) provides additional benefits in comparison with conventional braces. BRBs improve the energy dissipation efficiency and allow the limitation of the brace force to be taken up by the highly stressed anchorage. Cyclic loading tests were conducted to investigate the seismic performance of BRBs connected with post-installed anchors used to retrofit reinforced concrete frames. The tests showed that the proposed design method is feasible and increases strength as well as ductility to an adequate seismic performance level.
机译:在最近的地震中观察到的建筑物损坏表明,许多旧的钢筋混凝土结构可能容易受到严重地震的影响。一种合适的抗震改造解决方案是安装钢制支撑,以增加建筑物的强度和延展性。钢支撑具有一些引人注目的优势,例如它们的重量相对较轻,适合预制,并且可以为公用设施,检修口和轻便开口。撑杆通常连接到钢框架,这些钢框架使用后沿周边安装的混凝土锚固件固定在混凝土结构上。但是,这些带框架的钢制支架并非没有缺点,例如钢的使用量增加以及安装过程中的困难。因此,不带钢框架的支架似乎是一种有吸引力的选择。在这项研究中,将支架连接到配有锚固托架的角撑板,并通过一些后安装的混凝土锚固装置将其固定。清晰的结构系统和增加的锚固利用率使锚固得以精确而经济地设计。与传统的矫正器相比,屈曲矫正器(BRB)的使用提供了更多的好处。 BRB改善了能量消耗效率,并允许高应力锚固承受支撑力的限制。进行了循环载荷测试,以研究与后置锚固件连接的BRB的抗震性能,这些锚固件用于加固钢筋混凝土框架。测试表明,所提出的设计方法是可行的,并且可以将强度和延性提高到适当的抗震性能水平。

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