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高强钢组合偏心支撑钢框架结构中耗能连梁作为屈服构件采用普通钢(如Q345),而非耗能构件采用高强度钢材(如Q460),高强钢构件不仅有效降低了构件截面、节约钢材、降低造价,而且减弱了偏心支撑结构的刚度,使得层剪力分布状态与传统偏心支撑结构不同。为了研究这种新型结构在罕遇地震作用下的弹塑性层剪力分布状态,依据偏心支撑钢框架结构基于性能的设计方法设计了具有理想失效模式的5层、10层、15层和20层算例,并考虑了近场地震速度脉冲效应和远场地震加速度循环累计效应对结构的影响,采用动力时程分析方法计算结构在罕遇地震水准下的响应,根据结构弹塑性层剪力的平均值,提出了与我国规范相一致的弹塑性层剪力分布模式,并对比了已有的层剪力分布模式,该文建议的层剪力分布模式具有更高的精度,可为高强钢组合K形偏心支撑能量设计方法和塑性抗震设计理论提供参考依据。
High-strength steel combination of eccentric support steel frame structure of the energy-dissipation beam as the yield member using ordinary steel (such as Q345), while non-energy-consuming components using high strength steel (such as Q460), high strength steel components not only effectively reduce the component cross section, saving steel , Reduce the cost, but also weakened the stiffness of the eccentric support structure, making the distribution of layer shear force different from the traditional eccentric support structure. In order to study the shear distribution of the elasto-plastic layer under rare earthquakes, this new type of structure is designed based on the performance-based design method of the eccentric supported steel frame structure with 5, 10, 15 and 20 layers with ideal failure modes The influences of the near-field seismic velocity pulse effect and the cyclic cumulative effect of far-field seismic acceleration on the structure are taken into account. The dynamic time-history method is used to calculate the response of the structure under the rare earthquakes. According to the shear stress of the structural elastoplastic layer The average shear strength distribution of the elastic-plastic layer in accordance with China’s code is proposed and the existing layer shear distribution model is compared. The proposed layer shear distribution model has higher accuracy and can be used as high-strength steel Combined K-shaped eccentric support energy design method and plastic seismic design theory to provide a reference.