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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Influence of gusset plate connections and braces on the seismic performance of X-braced frames
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Influence of gusset plate connections and braces on the seismic performance of X-braced frames

机译:角撑板连接和支撑对X型支撑框架抗震性能的影响

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摘要

Braced frames are one of the most economical and efficient seismic resisting systems yet few full-scale tests exist. A recent research project, funded by the National Science Foundation (NSF), seeks to fill this gap by developing high-resolution data of improved seismic resisting braced frame systems. As part of this study, three full-scale, two-story concentrically braced frames in the multi-story X-braced configuration were tested. The experiments examined all levels of system performance, up to and including fracture of multiple braces in the frame. Although the past research suggests very limited ductility of SCBFs with HSS rectangular tubes for braces recent one-story tests with improved gusset plate designs suggest otherwise. The frame designs used AISC SCBF standards and two of these frames designs also employed new concepts developed for gusset plate connection design. Two specimens employed HSS rectangular tubes for bracing, and the third specimen had wide flange braces. Two specimens had rectangular gusset plates and the third had tapered gusset plates. The HSS tubes achieved multiple cycles at maximum story drift ratios greater than 2% before brace fracture with the improved connection design methods. Frames with wide flange braces achieved multiple cycles at maximum story drift greater than 2.5% before brace fracture. Inelastic deformation was distributed between the two stories with the multi-story X-brace configuration and top story loading.
机译:支撑框架是最经济,最有效的抗震系统之一,但很少进行全面测试。由美国国家科学基金会(NSF)资助的一项最新研究项目,旨在通过开发改进的抗震支撑框架系统的高分辨率数据来填补这一空白。作为这项研究的一部分,测试了多层X支撑配置中的三个全尺寸,两层同心支撑框架。实验检查了系统性能的所有级别,直到并包括框架中多个支撑的断裂。尽管过去的研究表明,带有HSS矩形管的SCBF支架的延展性非常有限,但最近的单层试验以及改进的角撑板设计表明,并非如此。框架设计采用AISC SCBF标准,其中两个框架设计还采用了为角撑板连接设计开发的新概念。两个标本使用HSS矩形管进行支撑,第三个标本使用宽法兰支撑。两个标本具有矩形角撑板,第三个标本具有锥形角撑板。通过改进的连接设计方法,在撑杆断裂之前,HSS管以最大层位移率大于2%的方式实现了多个循环。在撑杆断裂之前,具有宽凸缘撑杆的框架在最大层位移大于2.5%的情况下实现了多个循环。具有多层X形支架配置和顶层荷载的非弹性变形分布在两个楼层之间。

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