Mechanical properties of underpinning joints in structural moving: Experiments and numerical modeling
Mechanical properties of underpinning joints in structural moving: Experiments and numerical modeling
复制标题
结构移动中托换接头的机械特性：实验和数值模拟
DOI：
10.1002/tal.1379
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Xin Zhang
中科院分区：
文献类型：
--
作者：
Qingxia Yue;Xiaodan Ren;Xin Zhang
Underpinning is a key component in the structural moving process, especially for high‐rise buildings with gravitational loads. In this paper, a most commonly used 4‐sided wrapped underpinning joint with 2 underpinning beams and 2 coupling beams for the frame structures was investigated. Sixteen prototypes were tested considering different shear span‐to‐depth ratios, underpinning joint heights, reinforcement ratios, and so forth. The experimental results showed that the underpinning beams can fail in shear or flexure‐shear. The interface between the column and the beam is also prone to failure during the loading. Further, the bearing capacity can be greatly improved with decreasing of the shear span‐to‐depth ratio, whereas more damage may occur within the interface domain. In the numerical simulations, a damage–plasticity constitutive model was adopted, and the cohesive elements were used to model the old‐to‐new concrete interface between the column and beams. It was found that the numerical results agreed quite well with the experimental results. Thus, the proposed approach can be a useful basis for further analysis and optimized design of underpinning joints.
