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为保护文物建筑,以故宫灵沼轩钢结构为研究对象,采用数值模拟方法,研究了该结构动力特性及地震响应。基于结构残损现状及钢结点的半刚性特性,考虑3种工况来建立灵沼轩钢结构的有限元模型。通过模态分析,研究了不同工况条件下灵沼轩钢结构的基频和主振型。通过时程响应分析,研究了8度常遇地震作用下典型节点的变形及内力响应情况,讨论了结点刚度退化对结构抗震性能的影响。通过8度罕遇地震作用下的响应谱分析,研究了灵沼轩钢结构的抗倒塌能力。研究结果表明:结点刚度退化时,灵沼轩钢结构基频减小,振动形式发生改变;8度常遇地震作用下,结构保持稳定振动状态,其变形响应峰值趋于偏大,内力响应峰值趋于偏小,且均在容许值范围内。8度罕遇地震作用下,各工况条件下的钢结构均有良好的抗倒塌能力。
In order to protect the cultural relics, the steel structure of Lingyu Xuan Palace in the Forbidden City was taken as the research object. The numerical simulation method was used to study the dynamic characteristics and seismic response of the structure. Based on the current status of structural damage and the semi-rigid characteristics of steel joints, three kinds of working conditions are considered to establish the finite element model of the steel structure of Lingyu Xuan. Through modal analysis, the fundamental frequency and main mode of the steel structure of Lingyu Xuan under different working conditions were studied. Through the analysis of the time-history response, the deformation and internal force response of typical joints subjected to 8-degree frequent earthquakes are studied. The effect of node stiffness degradation on the seismic performance of structures is also discussed. Through the analysis of response spectrum under the effect of rare earthquakes of 8 degrees, the anti-collapse ability of the steel structure of Lingyu Xuan was studied. The results show that the fundamental frequency of the steel structure of Lingyu Xuan decreases and the vibration forms change when the node stiffness is deteriorated. Under the action of 8 degree of frequent earthquakes, the structure maintains stable vibration and its peak value of deformation response tends to be large, and the internal force response Peak tends to be small, and are within the allowable value range. Under the action of 8 degree rare earthquakes, the steel structures under all operating conditions have good anti-collapse ability.