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引用次数: 0
摘要
钢结构设计的一个关键部分是精心选择钢结构中的结构造型连接,因为连接的行为会影响结构的强度和位移特性。根据传递力矩的能力,框架分析中的连接可分为刚性连接、半刚性连接和销钉连接。此外,响应修正系数(R 系数)也是结构抗震设计中使用的有效参数。然而,抗震设计规范似乎并未考虑梁柱连接刚度系数对响应修正系数的影响。因此,我们研究了 3 层、6 层和 12 层的矩抵抗钢框架(MRSF)在静态推移和动态荷载下的 R 系数,根据连接刚度(m)的不同,采用了三种不同的梁柱连接形式。刚性连接、刚性半刚性连接和柔性半刚性连接的刚度分别为 20、10 和 5。对 MRSF 进行了十次不同频率含量和地动持续时间的记录。确定了延性降低系数(Rμ)、超强度降低系数(Ro)和 R 系数。结果表明,梁柱连接刚度系数会影响 R0、Rμ 和 R 因子。此外,R 系数受梁柱连接刚度系数和楼层框架数量的影响较大。
Effect of Beam-Column Connection Types on the Response Modification Factors of Steel Frames
A key component of steel structural design is the careful selection of structural modeling joints in steel structures, as the behavior of the joints affects the structure's strength and displacement characteristics. According to the capacity for transferring moment, connections in the analysis of frames are categorized as rigid, semi-rigid, or pinned. Also, the response modification factor (R-factor) is an effective parameter used in the seismic design of structures. However, the influence of the beam-column connection's stiffness factor on the response modification factor did not seem to have been considered in seismic design codes. Consequently, the R-factor under static pushover and dynamic loading is being studied for moment-resisting steel frames (MRSFs) with 3-, 6-, and 12-story using three different forms of beam-column connections depending on the connections' stiffness (m). The rigidities of the connections are taken 20, 10, and 5 for rigid, stiff semi-rigid, and flexible semi-rigid connections, respectively. The MRSFs are subjected to ten records with varying frequency contents and ground motion durations. The ductility reduction factor (Rμ), the over-strength reduction factor (Ro), and the R-factor were determined. The results indicated that the beam-column connection rigidity factors affected the R0, Rμ, and R-factors. Also, the R-factors were more affected by the rigidity factors for the beam-column connections and the number of story frames.
期刊介绍:
The International Journal of Steel Structures provides an international forum for a broad classification of technical papers in steel structural research and its applications. The journal aims to reach not only researchers, but also practicing engineers. Coverage encompasses such topics as stability, fatigue, non-linear behavior, dynamics, reliability, fire, design codes, computer-aided analysis and design, optimization, expert systems, connections, fabrications, maintenance, bridges, off-shore structures, jetties, stadiums, transmission towers, marine vessels, storage tanks, pressure vessels, aerospace, and pipelines and more.