摘要
为研究传统民居木结构十字形半榫节点及其角钢加固后的抗震性能,参照川西地区实际民居,按照1∶1.33的缩尺比例,制作了1个半榫节点和4个具有不同设计参数、采用角钢加固的半榫节点,并对其进行低周往复加载试验,得到了加固前后半榫节点的破坏形态、弯矩-转角滞回曲线、骨架曲线、刚度和耗能能力等抗震性能指标。结果表明:未加固半榫节点发生拔榫破坏,滞回曲线有明显的捏拢效应;加固节点所用角钢在限制榫头拔出的情况下,改变了十字形半榫节点的破坏形态,节点破坏时榫头折断、角钢变形较大,滞回曲线较为饱满;加固后节点的承载能力得到了不同程度的提升,刚度退化现象得到明显改善,节点变形能力有所提高,而耗能能力较未加固节点并无明显降低;单侧角钢加固对节点负向受拉的承载力比正向受压的承载力提高作用更加明显,而双侧角钢加固节点正负向承载力基本一致;单侧加固节点的刚度比双侧加固节点的刚度稍小,且随着角钢厚度的增大,节点刚度的提高作用越明显;而角钢肢长变化对节点的刚度影响不大。
In order to study the seismic behavior of cross-shaped half-tenon joints in traditional timber dwellings,pseudo-static tests of one 1/1. 33 scale half-tenon joint and four other 1/1. 33 scale joints reinforced by angle with different design parameters were carried out. These joints were designed based on western Sichuan engineering practice. The seismic behaviors of the joints such as failure mode,moment-rotation hysteresis and skeleton curves,rigidity and energy dissipation capacity were obtained. The results indicate that the unreinforced joint tenon fails in a pulling-out manner,and the hysteresis curve has obvious pinching effect. The failure mode of the reinforced joint is changed with the tenon restrained,and the tenon is broken off with large deformation of the angles,and the hysteresis curve is relatively plump. The stiffness,deformation and bearing capacity of the reinforced joints are significantly improved,however,the energy dissipation is not significantly reduced compared with the unreinforced joint. The improvement of the negative bearing capacity is more obvious than that in the positive direction for the reinforced specimen with a single-sided angle,while both the positive and negative bearing capacity of the reinforced specimens with two-sided angles are basically the same. The stiffness of the single-side reinforced specimen is slightly smaller than that of the two-side reinforced specimen. The improvement of the stiffness of the reinforced specimen is more obvious with the increase in the angle thickness,while the length of the angle limb has little influence on the stiffness of the specimen.
作者
薛建阳
任国旗
张家珩
许丹
XUE Jianyang;REN Guoqi;ZHANG Jiaheng;XU Dan(School of Civil Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance of the Ministry of Education,Xi'an University of Architecture&Technology,Xi'an 710055,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2021年第1期103-112,共10页
Journal of Building Structures
基金
国家“十三五”重点研发计划(2017YFC0703505)
国家自然科学基金项目(51678478)
陕西省自然科学基础研究重点项目(2020JZ-50)。
关键词
传统民居
木结构
半榫节点
角钢加固
低周往复加载试验
抗震性能
traditional dwelling
timber structure
half-tenon joint
angle reinforcement
low-cycle reversed loading test
seismic performance
