Refined three-dimensional numerical model for segmental joint and its application
Refined three-dimensional numerical model for segmental joint and its application
复制标题
节段接头精细化三维数值模型及其应用
DOI：
10.1002/suco.201900550
复制
发表时间：
2020
影响因子：
3.2
通讯作者：
Zhang Haihua
中科院分区：
文献类型：
--
作者：
Zhang Li;Feng Kun;Xu Peikai;He Chuan;Zhang Haihua
以往对节段节点的研究主要是基于试验和理论方法，很少有研究集中在精细的数值模型。为此，采用八节点实体单元和三维梁单元分别模拟节点结构和配筋，并考虑螺栓预紧力，建立了精细的数值模型。通过足尺试验对模型进行了验证，并分析了节点变形和螺栓预紧力对模型的影响。结果表明：（a）该数值模型能够较好地再现节理变形过程，（B）锚杆应力受节理张开引起的拉应力和节理竖向位移引起的弯应力控制，（c）节理变形随弯矩的变化可分为3个阶段;螺栓预紧力对节点变形随弯矩的变化没有影响，但对节点各阶段变形值有显著影响。
Previous research of segmental joints are mainly based on experimental and theoretical methods; few studies have focused on refined numerical model. Therefore, a refined numerical model is established in which eight-node solid element and three-dimensional beam element are adopted to simulate joint structures and reinforcement, respectively, and bolt preload is considered. Then, the numerical model is verified with full-scale tests and applied to analyze the influence of joint deformation and bolt preload. It is confirmed that (a) the numerical model can reproduce joint deformation process with good accuracy; (b) bolt stress are controlled by tensile action caused by joint opening and bending action caused by joint vertical displacement; (c) the changes of joint deformation with bending moment can be divided into three stages; bolt preload has no effect on the change of joint deformation with bending moment but has significant impact on the value of joint deformation in each stage.