考虑断裂损伤的足尺透榫节点抗震性能试验及恢复力模型研究
Seismic performance test and restoring force model of full-scale penetrated-tenon joints considering fracture damage
白福玉 1董飞 2隋龚 3薛建阳 3胡成明 2吴晨伟3
作者信息
- 1. 西安建筑科技大学理学院,陕西西安 710055;西安建筑科技大学土木工程学院,陕西西安 710055
- 2. 西安建筑科技大学土木工程学院,陕西西安 710055
- 3. 西安建筑科技大学土木工程学院,陕西西安 710055;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
- 折叠
摘要
为研究断裂损伤对古建筑木结构透榫节点抗震性能及恢复力模型的影响,对3个足尺铁杉透榫节点模型进行拟静力试验,通过声发射测试确定节点临界荷载和临界能量释放率,分析节点断裂损伤模式、滞回性能,提出考虑断裂损伤效应的节点恢复力模型.结果表明:往复荷载下透榫节点破坏为变截面与榫颈局部断裂,变截面局部为RL、LT及RT型断裂,榫颈局部为LT与RT型断裂.负向加载松动程度对节点能量释放率影响较大,负向最大能量释放率相差217.48kN/mm.拔榫量随松动程度增加而降低,正向加载拔榫量最多降低33.72％,负向加载拔榫量最多降低35.53％.变截面裂纹贯通前,随着节点松动增加,正负向加载初始滑移增大,弹性刚度减小,屈服刚度变化不大;榫颈截面开裂后,随着节点松动增加,正向加载刚度减小,负向加载刚度变化不大.
Abstract
To study the influence of fracture damage on the seismic performance and restoring force model of penetrated-tenon joints,quasi-static tests were carried out on three full-scale models of hemlock penetrated-tenon joints.The critical load and critical energy release rate of joints were determined by acoustic emission tests.The fracture damage mode and hysteretic performance of joints were analyzed,and the restoring force model of joints considering fracture damage effect was proposed.The results show that the failure of the penetrated-tenon joint under reciprocating load is the local fracture of variable cross-section and tenon neck.The local fracture modes of variable cross-section are RL,LT and RT,and the local fracture modes of tenon neck are LT and RT.The degree of loosening has a great influence on the energy release rate of the joint under negative loading,and the maximum difference of the negative energy release rate is 217.48kN/mm.The amount of tenon pullout decreases with the increase of loosening degree.The amount of tenon pullout under positive loading decreases by 33.72％at most,and the amount of tenon pullout under negative loading decreases by 35.53％at most.Before the penetration of variable cross-section cracks,with the increase of joint loosening,the initial slip of positive and negative loading increases,the elastic stiffness decreases,but the yielding stiffness changes little.After cracking of the cross section of tenon neck,with the increase of the joint loosening,the positive loading stiffness decreases,while the negative loading stiffness does not change much.
关键词
古建筑木结构/足尺透榫节点/声发射/断裂损伤/抗震性能/恢复力模型Key words
ancient timber structures/full-scale penetrated-tenon joints/acoustic emission/fracture damage/seismic performance/restoring force model引用本文复制引用
出版年
2025
NETL
NSTL
万方数据