开裂残损柱头科斗栱抗震性能及退化规律研究  

Study on seismic performance and degradation law of cracking damaged Dou-Gong bracket at columns

作　　者：薛建阳[1,2] 毛妍 宋德军 何圳 吴晨伟 叶重阳 XUE Jianyang;MAO Yan;SONG Dejun;HE Zhen;WU Chenwei;YE Chongyang(School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi′an 710055,China;Department of Architecture and Surveying Engineering,Shaanxi College of Communications Technology,Xi′an 710018,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]陕西交通职业技术学院建筑与测绘工程学院,陕西西安710018

出　　处：《西安建筑科技大学学报（自然科学版）》2024年第5期633-641,共9页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金(52278317)。

摘　　要：为研究构件开裂对斗栱抗震性能的影响,以沈阳故宫颐和殿柱头科斗栱为原型,建立了大斗、正心瓜栱、单翘及散斗分别开裂的斗栱有限元模型,通过体积损失率表征构件的开裂程度,对开裂斗栱开展抗震性能模拟分析.结果表明:不同开裂程度下,斗栱的滞回曲线及骨架曲线变化规律相似.大斗、单翘和散斗体积损失率达到3%时,加载后期滞回曲线发散明显,且散斗开裂斗栱的正向峰值位移小于其他开裂斗栱.散斗开裂斗栱的正向刚度、大斗开裂斗栱的负向刚度随体积损失率变化较为明显.当构件体积损失率为3%时,散斗开裂斗栱的正向承载力和大斗开裂斗栱的负向承载力退化最严重,退化率分别为16.90%和18.61%;构件开裂尽管降低了斗栱的承载力及刚度,但其变形和耗能能力较好.To study the impact of component cracking on the seismic performance of Dou-Gong(DG)brackets,the DG bracket at columns of the Yihe Hall in Shenyang Imperial Palace was selected as the structural prototype,and DG bracket finite element models with cracking in Da-Dou,Zhengxingua-Gong,Dan-Qiao,and San-Dou were established respectively.The seismic performance of cracked DG brackets was simulated and analyzed by using the volume loss rate to characterize the cracking degree of components The results show that the hysteretic curve and skeleton curve of each DG bracket are similar under different cracking degrees.When the volume loss rate of Da-Dou,Dan-Qiao,and San-Dou reaches 3%,the hysteretic curve diverges obviously at the later loading stage,and the positive peak displacement of the cracked San-Dou DG bracket is smaller than other cracked DG brackets.The positive stiffness of DG brackets with cracked San-Dou and the negative stiffness of DG brackets with cracked Da-Dou change obviously with the volume loss rate.When the volume loss rate reaches 3%,the degradation rates of the positive bearing capacity of DG brackets with cracked San-Dou,and the negative bearing capacity of DG brackets with cracked Da-Dou are seriously degraded,with degradation rates of 16.90%and 18.61%respectively.Although component cracking reduces the bearing capacity and stiffness of the DG brackets,they still have good deformation and energy dissipation ability.

关 键 词：古建筑木结构 柱头科斗栱 开裂残损 抗震性能 数值模拟 

分 类 号：TU366.2[建筑科学—结构工程]