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根据GSA和DoD为预防结构逐步破坏而制订的规范中所推荐的APM方法,对提高重力荷载下,钢结构抗弯能力的三种改造方法的有效性进行了分析。主要采用的是三维非线性动力分析法。分析模型为6×3跨的18层钢结构,这个结构曾由于底层突然移除一根柱而遭受到破坏。对跨长为5,6,7·5,9m的4个建筑进行了分析。分别采用三种方法改造结构并对其进行了评估,即增加梁的强度、增加梁的刚度以及同时增加梁的强度与刚度。通过分析改造后梁的转角、约束力和位移延性这三个性能指标的增强效应,来评估相应改造方法的有效性。
Based on the APM method recommended by the GSA and DoD codes for the progressive destruction of the preventive structure, the effectiveness of three retrofit methods to improve the flexural capacity of steel structures under gravity load was analyzed. The main use of three-dimensional nonlinear dynamic analysis. The analytical model is a 6 × 3 span 18-story steel structure that was damaged by the sudden removal of a column at the bottom. Four buildings spanning 5, 6, 7 · 5 and 9m were analyzed. Three methods were used respectively to rebuild and evaluate the structure, namely, increasing the strength of the beam, increasing the rigidity of the beam and at the same time increasing the strength and rigidity of the beam. By analyzing the reinforcement effect of the three performance indexes of the modified beam, such as the rotation angle, the binding force and the displacement ductility, the validity of the corresponding reconstruction method is evaluated.