【作者】 王旭；

【导师】 杨光辉； 刘永健；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2014， 硕士

【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。更多还原

【Abstract】 As the bridge engineering technology is reforming rapidly, design span of bridgestructure keeps increasing, and pier height records constantly being refreshed. Under thisbackground, study on the new type of pier column structures has become an urgent andvaluable issue. Based on the study of the mechanical properties of concrete filled steel tubularstructure and the fact that steel box columns are easy to buckle, we proposed the PBLstiffened thin-walled steel box concrete pier column structure. After doing many field tests, aseries of studies were done by using the ABAQUS finite element analysis software, getting alot of useful results. The major researches are as follows:Firstly, focusing on how to do the finite element simulation of the PBL stiffenedthin-walled steel box concrete pier column structure. The emphasis was of the simulationmethod of the PBL stiffener, and the simulation of the interaction relationship of steel box,core concrete and the PBL is also a difficult problem. In order to get an accurate finiteelement analysis model, we had to adjust the model parameters based on the test results.Secondly, analyzing the finite element model of axial compression short columnstructures, simulating the ordinary steel box concrete structure and steel box concrete shortcolumns structure with longitudinal stiffened ribs as contrastive models. Do further study onthe mechanical force-transmission mechanism and failure mode. In order to make evaluationon the stress superiority, we analyzed the mechanical properties of the steel-concrete interface.Do analysis on the limit capacity, while parameters of PBL stiffened steel box hole-openingrate are changing.Thirdly, we established the finite element model of axial compression short columnstructures of PBL stiffened thin-walled steel box concrete, studying on the structuredeformation, stress nephogram, stress path curves Also, compare the ordinary steel boxconcrete structure and steel box concrete short columns structure with longitudinal stiffenedribs, so that we can know more about the stress mechanism and failure mode. We get themechanical properties of various long column models by setting load displacement curve,strain curve, ultimate capacity curve, and ductility index. we did further study on the effectsof slenderness ratio on failure modes.Fourthly, Take a high pier belonging to same continuous rigid frame bridge as theprototype and brief design the hollow pier stiffened by PBL, Make full use of the symmetry,established1/8segment veneer model of the pier，verify the above analysis process. Analyzethe mechanical properties of the component whole, the steel-concrete interface, the stressmechanism and failure mode. The results of this paper can provide reference for the practicalapplication of the new structure.更多还原