PBL加劲型薄壁钢箱混凝土墩柱静力性能有限元分析

发布时间：2018-06-30 00:46

本文选题：薄壁钢箱混凝土墩柱 + PBL　；参考：《长安大学》2014年硕士论文

【摘要】：在桥梁工程技术革新的背景下，桥梁设计跨度不断增大，墩高也在不断被刷新，开展新型墩柱结构的研究成为一项迫切的课题，具有重要的理论意义和工程应用价值。基于钢箱混凝土结构优良的力学性能以及钢箱易屈曲的特点，提出PBL加劲型薄壁钢箱混凝土墩柱结构。本文在前期试验研究的基础上，利用ABAQUS有限元分析软件，对其开展一系列研究，主要内容包括： 1．研究PBL加劲型薄壁钢箱混凝土墩柱的有限元模拟方法，重点研究PBL加劲肋的模拟方法，研究PBL、钢箱、核心混凝土相互作用关系的模拟方法，并基于试验结果调整模型参数，得到了较为精确的有限元分析模型。 2．进行了PBL加劲型薄壁钢箱混凝土轴压短柱的有限元分析，同时建立普通钢箱混凝土、设钢板纵肋钢箱混凝土短柱的对比模型，深入研究其受力传力机理和破坏模式，分析钢-混界面力学性能，探讨其受力优越性，并进行了PBL开孔率的承载力影响分析。 3．开展了PBL加劲型薄壁钢箱混凝土轴压长柱的有限元分析，，同时建立普通钢箱混凝土、设钢板纵肋钢箱混凝土长柱的对比模型。通过结构变形图、应力云图、应力路径关系曲线，深入研究不同截面形式长柱的受力机理和破坏模式；通过荷载-位移关系曲线、荷载-纵横向应变关系曲线、极限承载力及位移延性系数对比分析各类长柱的整体力学性能；并研究了长细比对长柱破坏模式的影响。 4．以某连续刚构桥高墩为原型，简要设计了其PBL加劲型空心薄壁钢箱混凝桥墩形式。充分利用对称性，建立了桥墩节段的1/8单板模型，分析其整体力学性能、钢-混界面力学性能、受力机理和破坏模式，对其实际应用提供参考和建议。
[Abstract]:Under the background of the technical innovation of bridge engineering, the design span of the bridge is increasing and the height of the pier is being refreshed constantly. It is an urgent task to carry out the research on the new pier and column structure, which has important theoretical significance and engineering application value. Based on the excellent mechanical properties of steel box concrete structure and the easy buckling characteristics of steel box, PBL stiffened thin-walled steel box concrete pier column structure is proposed. On the basis of previous experimental research, a series of studies are carried out by Abaqus finite element analysis software. The main contents are as follows: 1. The finite element simulation method of PBL stiffened thin-walled steel box concrete pier column is studied. The simulation method of PBL stiffener and the simulation method of PBL, steel box and core concrete interaction are studied, and the model parameters are adjusted based on the test results. A more accurate finite element analysis model is obtained. 2. The finite element analysis of PBL stiffened thin-walled steel box concrete columns under axial compression is carried out. At the same time, the comparison model of ordinary steel box concrete and steel plate longitudinal ribbed concrete short columns is established. The mechanism of force transfer and failure mode are studied, the mechanical properties of steel-mixing interface are analyzed, and the superiority of force transfer is discussed. The influence of PBL porosity on bearing capacity is analyzed. 3. Finite element analysis of PBL stiffened thin-walled steel box concrete columns under axial compression is carried out, and the common steel box concrete is established at the same time. A comparative model of steel box concrete column with steel plate longitudinal rib. Through the structural deformation diagram, stress cloud diagram, stress path relation curve, the stress mechanism and failure mode of long columns with different cross-section forms are deeply studied, the load-displacement relation curve, the load-longitudinal and transverse strain relation curve, The ultimate bearing capacity and displacement ductility coefficient are compared to analyze the overall mechanical properties of all kinds of long columns, and the influence of aspect ratio on the failure mode of long columns is studied. 4. Taking the high pier of a continuous rigid frame bridge as the prototype, The PBL stiffened hollow thin-walled steel box concrete pier is designed briefly. Based on the symmetry, the one-eighth veneer model of pier segment is established, and its overall mechanical properties, mechanical properties of steel-mixing interface, stress mechanism and failure mode are analyzed. The results provide some references and suggestions for its practical application.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5;U443.22

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