【作者】 刘畅；

【导师】 蔡勇； 胡金星；

【作者基本信息】 中南大学 ， 土木水利（专业学位）， 2025， 硕士

【摘要】 半刚性组合节点因施工效率高、抗震性能好,成为了建筑工程领域的研究焦点。本文提出了一种以槽钢组件作为弱轴方向连接件的新型半刚性组合节点,其安装便捷且力学性能卓越,并运用数值模拟和理论研究相结合的方法,对该节点展开深入探究。主要工作如下:(1)通过ABAQUS有限元软件对新型半刚性组合节点力学性能进行分析。结果表明,相较于同样构造的钢节点,新型半刚性组合节点在力学性能方面有显著提升。节点的初始转动刚度提升了20%以上,屈服弯矩提升了30%以上,极限弯矩提升了40%以上,极限转角提升了30%以上,承载能力和耗能能力均有大幅增强。(2)系统性的分析新型半刚性节点各参数对其力学性能的影响,对12种不同的参数进行了分析并得出各参数对新型半刚性组合节点力学性能的影响以及各参数之间的耦合效应。其中,高强螺栓直径、端板厚度、混凝土楼板厚度和混凝土楼板配筋率是关键影响参数。当混凝土楼板厚度每提升10 mm,节点的初始转动刚度提升约20%,极限弯矩提升约10%;端板厚度每提升2 mm、混凝土楼板厚度每提升10 mm、混凝土楼板配筋率每提升0.29%,极限转角下降约10%。同时,各参数间存在耦合效应,如楼板厚度与钢梁强度、混凝土强度与楼板配筋率等之间的耦合对节点力学性能影响不容忽视。(3)基于组件法,提出针对新型半刚性组合节点的初始转动刚度和屈服弯矩的计算方法,并将使用该计算方法得出的理论值与运用ABAQUS有限元软件分析得出的模拟值进行比较,以验证该计算方法的准确性。结果表明,所提出的计算方法可以准确的计算新型半刚性组合节点在负、正弯矩作用下的初始转动刚度和屈服弯矩。图52幅,表23个,参考文献98篇。更多还原

【Abstract】 Semi-rigid composite joints have become a focal point of research in the field of construction engineering due to their high construction efficiency and good earthquake resistance.This thesis proposes a novel semi-rigid composite joint that utilizes channel steel components as the connection piece in the weak-axis direction,which is convenient to install and exhibits excellent mechanical performance.A comprehensive investigation of this joint is conducted using a combination of numerical simulations and theoretical research.The main contributions are as follows:(1)The mechanical properties of the new semi-rigid composite joints were analyzed by ABAQUS finite element software.The results show that compared with the steel joints of the same structure,the mechanical properties of the new semi-rigid composite joints are significantly improved.The initial rotational stiffness of the joint is increased by more than 20%,the yield moment is increased by more than 30%,the ultimate bending moment is increased by more than 40%,the ultimate rotation is increased by more than 30%,and the bearing capacity and energy dissipation capacity are greatly enhanced.(2)A systematic analysis of the impact of various parameters on the mechanical performance of the new semi-rigid joint is performed,examining 12 different parameters to determine their effects on the mechanical performance of the new semi-rigid composite joint and the coupling effects among these parameters.Key influencing parameters include the diameter of high-strength bolts,the thickness of the end plate,the thickness of the concrete slab,and the reinforcement ratio of the concrete slab.For instance,with every 10 mm increase in concrete slab thickness,the initial rotational stiffness of the joint increases by approximately 20%,while the ultimate moment increases by about 10%.Furthermore,for every 2 mm increase in end plate thickness,every 10 mm increase in concrete slab thickness,and every 0.29%increase in concrete slab reinforcement ratio,the ultimate rotation decreases by approximately10%.Additionally,there are notable coupling effects among various parameters,such as the interaction between concrete slab thickness and steel beam strength,as well as between concrete strength and concrete slab reinforcement ratio,which significantly influence the mechanical performance of the joint.(3)Based on the component method,the calculation method of yield moment and initial rotational stiffness of the new semi-rigid composite joint is proposed.The theoretical values obtained by the calculation method are compared with the simulated values obtained by using ABAQUS finite element software to verify the accuracy of the calculation method.The results show that the proposed calculation method can accurately calculate the yield moment and initial rotational stiffness of the new semi-rigid composite joint under negative and positive bending moments.更多还原