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抗弯钢框架的梁-柱节点在地震中可能会遭受超低周疲劳(ELCF)。使用循环孔洞增长模型(CVGM)——1个基于微观力学的断裂模型——预测梁-柱连接的ELCF断裂。9个足尺连接试件的试验结果验证了该模型的有效性。此外,采用精细有限元模型模拟连接件的循环性能,基于应力和应变的时间历程计算CVGM裂缝指数。CVGM预测的出现ELCF断裂前的循环次数和累积变形与试验结果相符。该方法能够准确预测非弹性循环荷载作用下梁-柱节点的ELCF断裂。
Beam-column joints of flexural steel frames may experience ultra-low cycle fatigue (ELCF) during earthquakes. Use Cyclic Hole Growth Model (CVGM) - A Fracture Model Based on Microcosmic Mechanics - Predict ELCF Fracture of Beam-Column Connections. The test results of nine full-scale test specimens verify the effectiveness of the model. In addition, the finite element model was used to simulate the cyclic behavior of the connector and the CVGM fracture index was calculated based on the stress and strain time histories. The occurrence of CVGM predictions The number of cycles before ELCF rupture and cumulative deformation are consistent with the experimental results. This method can accurately predict the ELCF fracture of beam-column joints under the nonelastic cyclic loading.