分阶段受力的可恢复功能柱脚节点抗震性能研究

STUDY ON SEISMIC PERFORMANCE OF AN EARTHQUAKE-RESILIENT COLUMN BASE WITH MULTISTAGE RESISTANCE

  • 摘要: 为发挥框架柱的塑性承载性能,提出分阶段受力的可恢复功能柱脚节点。通过设置前期不参与受力、后期可提供一定抗力的限位件,使节点在容许的变形范围内功能可恢复,大变形情况下充分发挥结构的承载潜能。由理论分析,给出新型柱脚节点的理论荷载-位移关系。而后基于试验验证的有限元分析方法,对其进行静力推覆和滞回分析。结果表明:分阶段受力设计理念切实可行,据此提出的柱脚节点可以实现分阶段受力,兼顾了功能恢复与承载需求。理论分析准确可靠,可用于预测柱脚节点的荷载-位移曲线。采用分阶段受力的设计理念,优化了传统可恢复功能柱脚节点的耗能模式。

     

    Abstract: To exert plastic bearing capacity of columns, an earthquake-resilient column base with multistage resistance was proposed. By setting limit members that do not participate in the force in the early stage and can provide certain resistance in the later stage, the function of the column base can be restored within allowable deformation range, and the bearing capacity of structures can be fully employed under large deformation state. The relationship of the bearing capacity and displacement for the column base was given out through a theoretical analysis. Based on the verified finite element analysis method, the static pushover analyses and hysteretic analyses were conducted. The results show that the design concept of multistage resistance was feasible. The column base proposed can realize multistage resistance. The requirements of function recovery and bearing capacity were simultaneously considered. The theoretical analysis was accurate and reliable, which can be used to estimate the load-displacement curves of the column bases. The energy dissipation mode of traditional earthquake-resilient column bases was optimized by a novel design concept.

     

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