明代隆昌寺无梁殿的动力特性及抗震性能研究

Research on the dynamic properties and seismic behavior of the brick-vault hall of Longchang Temple

镇江宝华山隆昌寺无梁殿是明代砖砌无梁殿这一中国特有的建筑遗产类型的代表。为了评估该建筑遗产在地震作用下的结构安全状况,建立了隆昌寺无梁殿的三维有限元模型,并对其进行了动力特性分析、振型分解反应谱分析和地震时程分析,得出了其固有频率、模态振型、地震作用效应以及地震位移和应力响应。结果表明:隆昌寺无梁殿的结构布置对称性较高,抗扭刚度较大。地震作用对隆昌寺无梁殿的振动影响程度排序如下:屋顶、二层侧墙和拱券、腰檐、一层侧墙和拱券。在7度多遇地震、设防地震和罕遇地震作用下,隆昌寺无梁殿中受力最危险的是一层远离楼梯一侧的拱窗脚和槛墙交接处,此外各拱脚均易发生拉裂破坏,是抗震薄弱位置。最后,综合动力特性和抗震性能分析的结果,提出了隆昌寺无梁殿的抗震加固建议。

The brick-vault hall of Longchang Temple at Baohua Mountain is a representative of a series of Ming Dynasty brick-vault halls—a unique architectural heritage type in China.In order to evaluate the structural safety of this architectural heritage in earthquakes,we set up a three-dimensional finite element model to analyze its dynamic properties,seismic response spectrum and seismic time history in order to obtain the natural frequencies,modal modes,seismic effect,and seismic deformation and stress response.The results show that the structure of the hall features high symmetry and high torsional rigidity.The degrees of influence of earthquake on the vibration of the hall are as follows:roof,side walls and arch on the second floor,eaves of the first floor,side walls and arch on the first floor.Under the Intensity 7 frequently-occurring earthquake,precautionary earthquake,and rarely-occurring earthquake,the most dangerous position of the hall is the junction of the arched window impost and sill wall on the side far away from the stairs on the first floor.In addition,prone to the tensile damage,each arch impost is a weak position in an earthquake.Finally,a seismic strengthening strategy for the brick-vault hall of Longchang Temple is presented based on the results of dynamic properties and seismic behavior analysis.