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Effect of modeling assumptions on the seismic behavior of steel buildings with perimeter moment frames

机译：建模假设对具有周边弯矩框架的钢结构房屋抗震性能的影响

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Several issues regarding the structural idealization of steel buildings with perimeter moment resisting steel frames (MRSFs) and interior gravity frames (GFs) are studied. Results indicate that the contribution of GFs to the lateral structural resistance may be significant. The contribution increases when the stiffness of the connection of the GFs is considered and is larger for inelastic than for elastic behavior. The interstory shears generally increase when the connections stiffness is taken into account. Resultant stresses at some base columns of MRSFs also increase in some cases but to a lesser degree. For columns of the GFs, however, the increment is significant. Results also indicate that modeling the building as planes frames may result in larger interstory shears and displacements and resultant stresses than those obtained from the more realistic 3-D formulation. These differences may be much larger when semi-rigid (SR) connections are considered. The conservativism is more for resultant stresses. The differences observed in the behaviour of each structural representation are mainly due to a) the elements that contribute to strength and stiffness and b) the dynamics characteristics of each structural representation. It is concluded that, if the structural system under consideration is used, the three-dimensional model should be used in seismic analysis, the GFs should be considered as part of the lateral resistance system, and the stiffness of the connections should be included in the design of the GFs. Otherwise, the capacity of gravity frames may be overestimated while that of MRSFs may be underestimated.
机译：研究了关于具有抗周矩钢框架（MRSF）和内部重力框架（GFs）的钢结构的结构理想化的几个问题。结果表明，GFs对侧向结构阻力的贡献可能很大。当考虑到GF的连接刚度时，该贡献增加，并且对于非弹性而言，其贡献要大于对弹性行为的贡献。当考虑连接刚度时，层间剪切通常会增加。在某些情况下，在MRSF的某些基础柱上产生的应力也会增加，但程度较小。但是，对于GF的列，增量是显着的。结果还表明，与从更逼真的3-D公式获得的结果相比，将建筑物建模为平面框架可能会导致更大的层间剪切和位移以及所产生的应力。考虑半刚性（SR）连接时，这些差异可能会更大。保守主义更倾向于合力。在每个结构表示形式的行为中观察到的差异主要是由于a）有助于强度和刚度的元素以及b）每个结构表示形式的动力学特性。结论是，如果使用考虑中的结构系统，则应在地震分析中使用三维模型，应将GFs视为侧向阻力系统的一部分，并将连接的刚度包括在内。 GF的设计。否则，重力框架的能力可能会被高估，而MRSF的能力可能会被低估。

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