Li Wei, Wang Jie, Xing Xiaobo, Liu Huining, Di Jin, Sun Xianchao, Li Leibo, Li Hongwei, Qin Fengjiang
Shandong Expressway Qingdao Construction Management Co., Ltd., Qingdao 266300, China.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, School of Civil Engineering, Chongqing University, Chongqing 400045, China.
Materials (Basel). 2024 Dec 17;17(24):6168. doi: 10.3390/ma17246168.
High-strength bolt connectors, known for their robust strength and ease of disassembly, are suitable not only for the construction of new steel-concrete composite beams but also for reinforcing existing composite or steel beams. Static push-out tests were performed on nine specimens to examine their shear behavior. The primary failure mode was observed at the steel-concrete interface, characterized by the tensile-shear failure of the bolt and localized crushing of the concrete beneath the bolt. The preload had no significant influence on the ultimate bearing capacity and ultimate slip displacement, while it had a substantial impact on the initial slip load. The failure process was divided into static friction at the interface, sliding at the interface, elastic deformation of the bolt, and plastic deformation of the bolt. The parametric analysis using the finite element method was performed to assess the impact of concrete strength, reserved hole diameter, interface friction coefficient, and bolt diameter and strength. It revealed that the ultimate bearing capacity is composed of interfacial friction and bolt shear capacity, which are not independent of each other. To decouple these components, a novel calculation method for determining the ultimate bearing capacity of high-strength bolt connectors was developed and validated using existing test data.
高强度螺栓连接件以其强大的强度和易于拆卸而闻名，不仅适用于新建钢-混凝土组合梁的施工，也适用于加固现有的组合梁或钢梁。对九个试件进行了静态推出试验，以研究其抗剪性能。主要破坏模式出现在钢-混凝土界面，其特征是螺栓的拉剪破坏和螺栓下方混凝土的局部挤压破坏。预紧力对极限承载力和极限滑移位移没有显著影响，但对初始滑移荷载有很大影响。破坏过程分为界面静摩擦、界面滑动、螺栓弹性变形和螺栓塑性变形。采用有限元方法进行参数分析，以评估混凝土强度、预留孔直径、界面摩擦系数、螺栓直径和强度的影响。结果表明，极限承载力由界面摩擦力和螺栓抗剪承载力组成，二者并非相互独立。为了解耦这些分量，开发了一种确定高强度螺栓连接件极限承载力的新计算方法，并利用现有试验数据进行了验证。
