嘉峪关光化楼砖墙结构对抗震性能的影响
巴振宁1,焦 鹏2,刘冰松2,张 翔3

(1.天津大学 土木工程系,天津 300072; 2.天津大学 国际工程师学院,天津 300072; 3.嘉峪关丝路(长城)文化研究院,甘肃 嘉峪关 735100)

光化楼; 纯木结构; 砖木混合结构; 模态分析; 时程分析

The Influence of Brick Wall Structure of Jiayuguan Guanghua Building on Seismic Performance
BA Zhenning1,JIAO Peng2,LIU Bingsong2,ZHANG Xiang3

(1.School of Civil Engineering,Tianjin University,Tianjin 300072,China)(2.Tianjin International Engineering Institute,Tianjin University,Tianjin 300072,China)(3.Jiayuguan Silk Road(Great Wall)Culture Research Institute,Jiayuguan 735100,Gansu,China)

Guanghua building; pure wood structure; brick-wood mixed structure; modal analysis; time-series analysis

备注

以嘉峪关光化楼为研究对象,基于榫卯、斗拱节点、柱墙接触之间的关系,利用ANSYS软件分别建立了纯木结构与砖木混合结构的光化楼模型。通过模态分析和输入多种地震波进行动力时程分析,结果表明:①砖墙结构大大提高了光化楼低阶自振频率,在高阶振型中自振频率的差距逐渐减小; ②砖墙结构使结构在地震时程分析下的加速度峰值有了明显增大,这与结构自振周期降低有关; ③在地震作用下,砖墙结构使结构的位移峰值显著减小,对防止木构架侧移倒塌有很大贡献; ④纯木结构模型位移反应较大,但仍小于木结构建筑弹塑性层间位移角1/50的限值; ⑤在Ⅷ度罕遇地震作用下,砖墙结构底部及开洞处的塑性应变较大,具体可能表现为砖墙底部以及砖墙与木门连接处出现裂缝。

Taking the Jiayuguan Guanghua building as the research object,we use the ANSYS software to build a pure wood structure and a brick-wood mixed structure Guanghua building models.based on the relationship between tenon-mortise joints,bucket arch nodes,and column-wall contact.Through model analysis and dynamic time-series analysis of various input seismic waves,the following conclusions are obtained:the brick tube structure greatly improves the low-order natural frequency of the Guanghua building,and the natural frequency gradually equals in the high-order mode.The displacement response of the pure wood structure model under the ground motion is greater,but it is still less than the limit of 1/50 of the displacement angle between the elastoplastic layers of the wood structure building.The brick wall structure significantly increases the peak acceleration of the structure under seismic time-series analysis,which is related to the reduction of the structure's natural vibration period.The brick wall structure significantly reduces the peak displacement of the structure,which greatly contributes to preventing the lateral collapse of the wooden frame.Under the 8-degree rare earthquake,the plastic strain at the bottom of the brick wall structure and at the opening is large,which may be manifested by cracks at the bottom of the brick wall and the connection with the wooden door.