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为了解砌块填充对特殊的同心斜撑框架(CBFs)抗震性能的影响,对其进行了试验研究和理论分析。为了便于比较,对两个特殊的同心斜撑框架(有砌块填充和无砌块填充)以及一个砌块填充的抗弯钢框架的半尺寸样本进行横向荷载试验。对试验结果进行比较分析,并使用经过试验结果验证的详细的有限元模型来研究砌块填充对加固板和顶底角钢连接的潜在破裂的影响。砌块填充能够使特殊同心斜撑框架的横向刚度提高33%、承载力提高41%。然而,砌块填充和框架间的相互作用显著增加了连接件的应力要求和潜在失效概率。试验结果和模拟分析表明,如果在同心斜撑框架的抗震设计过程中忽视砌块填充的影响,将会导致连接焊缝的早期断裂并显著降低框架的变形能力和延性。这会对强震下结构的抗震性能产生不利的影响。研究结果与2003年发生在伊朗巴姆的地震震害结果较为吻合。
In order to understand the effect of block filling on the seismic performance of special concentric braced frames (CBFs), the experimental research and theoretical analysis were carried out. For ease of comparison, lateral load tests were performed on two special concentric braced frames (with and without block fill) and a half-size sample of a block-filled, flexural steel frame. A comparative analysis of the test results was carried out and the detailed finite element model validated by the test results was used to study the effect of block filling on the potential failure of the stiffener and the connection of the top and bottom corners. Block filling can increase the lateral stiffness of special concentric braced frames by 33% and increase the bearing capacity by 41%. However, the interaction between block filling and the frame significantly increases the stress requirements and potential failure probability of the connector. The experimental results and simulation results show that if the influence of block filling is neglected in the seismic design of concentric bracing frames, it will lead to early fracture of the joint and significantly reduce the deformation capacity and ductility of the frame. This will adversely affect the seismic performance of structures under strong earthquakes. The results are in good agreement with the earthquake damage results in 2003 in Bam, Iran.