基于模态柔度曲率的砖石古塔损伤识别研究  

Research on damage identification of masonry pagodas based on modal flexibility curvature

作　　者：卢俊龙[1] 乔璐 张晨 李哲[1] 田煜 LU Jun-long;QIAO Lu;ZHANG Chen;LI Zhe;TIAN Yu(School of Civil Engineering and Architecture,Xi’an University of Technology,Xi’an 710048,China;TBEA China Xinjiang Sunoasis Co.,Ltd.,Xi’an 710061,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048 [2]特变电工新疆新能源股份有限公司,西安710061

出　　处：《计算力学学报》2024年第3期534-541,共8页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(51778527);陕西省重点研发计划(2022SF-376)资助项目.

摘　　要：损伤识别是结构性能评估的有效途径之一,砖石古塔的模态柔度曲率是进行损伤识别的有效参数之一。为研究古塔结构损伤机制与模态柔度曲率的关系,依据兴教寺窥基塔结构模型振动台试验及数值模拟结果,分析周期性荷载作用下塔体动力响应及破坏特征,建立了塔体损伤程度与模态参数的关系模型。结果表明,古塔结构开裂破坏后,刚度减小,模态柔度曲率增大;数值计算与试验测试所得加速度及频域响应规律一致,塔体模型结构试件的开裂损伤随加载工况增多而持续累积,加载前期损伤参数变化缓慢,而后保持稳定,试验及模拟所得塔体的破坏过程一致。因此,塔体模态柔度曲率变化与古塔结构损伤累积具有一致性,可用于有效可靠识别砖石古塔结构损伤识别。Damage identification is one of the effective ways to evaluate structural performance,and the modal flexibility curvature of masonry pagodas is one of the effective parameters for damage identification.To study the relationship between the damage mechanism and the modal flexibility curvature of the ancient pagoda structure,based on the shaking table test and numerical simulation results of the structural model of Xingjiaoji pagoda,the dynamic response and damage characteristics of the pagoda under periodic loading are analyzed,and the relationship between the damage and modal parameters of the pagoda are modeled.The results show that after the cracking and damage of the tower structure,the stiffness decreases and the modal flexibility curvature increases;the acceleration and frequency domain response patterns obtained from the numerical calculation and test are consistent,the crack damage of the tower specimen continues to accumulate with the increase of loading,the damage parameters change slowly in the early stage of loading and then remain stable,and the damage process of the tower obtained from the test and simulation is consistent.Therefore,the modal flexibility curvature change of the tower is consistent with the structural damage accumulation of the masonry pagoda,which is effective and reliable for the structural damage identification of masonry pagodas.

关 键 词：砖石古塔 损伤识别 柔度曲率 损伤机制 

分 类 号：O346.5[理学—固体力学]