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故宫灵沼轩是一座砌体结构与钢结构组合而成的文物建筑。为有效对其保护,采用数值模拟方法,研究了风振作用下结构的动力响应。基于灵沼轩结构现状,建立了有限元模型。通过模态分析,获得了灵沼轩的基频和主振型;通过对结构施加y向脉动风荷载,研究了重现期为50年时结构的风振特性,评价了结构在风荷载作用下的安全现状。结果表明:灵沼轩结构基频为f=5.75Hz,在x及y向的主振型以局部振动为主;脉动风压作用下,结构保持稳定振动状态,但顶部位置加速度峰值偏大。另风压作用下,砌体结构部分位置的抗拉强度不足,应在日常维护中予以重视;钢结构部分由于材料强度大,因而不会出现强度破坏。
Forbidden City Lingmo Xuan is a combination of masonry and steel structure of heritage buildings. In order to effectively protect it, a numerical simulation method is used to study the dynamic response of the structure under wind vibration. Based on the current status of Lingyu Xuan structure, a finite element model was established. Through the modal analysis, the fundamental frequency and the main vibration mode of Lingyu Xuan are obtained. By applying y-direction pulsating wind load to the structure, the wind-vibration characteristics of the structure with a recurrence period of 50 years are studied. Under the security status. The results show that the fundamental frequency of Lingyu Xuan is f = 5.75Hz, and the main vibration modes in the x and y directions are dominated by local vibration. Under the action of fluctuating wind pressure, the structure maintains a steady state of vibration but the peak of acceleration at the top position is large. In addition, under the action of wind pressure, the tensile strength of the part of the masonry structure is not sufficient and should be paid attention to in routine maintenance. Due to the strength of the material, the steel structure will not be damaged in strength.