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前期研究表明:梁铰破坏机制下,抗弯钢框架节点处的柱梁抗弯强度比应高于1.0甚至2.0。同时也指出,为了防止结构出现薄弱层,对结构的全部节点仅使用单一的柱梁抗弯强度比限值是不切实际的。因此,需要对节点处的柱梁抗弯强度比进行优化设计。给出了确保抗弯钢框架结构中梁铰机制的多目标抗震设计方法,并将其应用于著名的抗弯钢框架结构的抗震设计中。除利用约束确保梁铰机制外,通过考虑两个不同的目标函数给出了结构的建筑费用和能量耗散能力的关系式。为了在替代方法中选出用于指导结构工程师工作的最佳设计方法,以耗散能量密度(耗能能力与结构重量之比)的形式给出一种简单的方法。
Previous studies have shown that under the failure mechanism of beam joints, the flexural strength ratio of column girders at flexural steel frame joints should be higher than 1.0 or even 2.0. It is also pointed out that it is impractical to use only a single beam bending strength ratio limit for all nodes of the structure in order to prevent the structure from being weak. Therefore, it is necessary to optimize the bending strength ratio of the column girder at the node. The multi-objective seismic design method to ensure the beam-hinged mechanism in the frame structure of flexural-resistance steel is given and applied to the seismic design of the famous flexural-resistance steel frame structure. In addition to using constraints to ensure the beam-hinged mechanism, the relationship between construction cost and energy dissipation capacity of the structure is given by considering two different objective functions. In order to choose the best design method to guide the work of a structural engineer in an alternative method, a simple method is given in the form of dissipating the energy density (ratio of energy dissipation to structure weight).