【作者】 王鑫；

【导师】 杨明；

【作者基本信息】 东南大学 ， 桥梁与隧道工程， 2021， 硕士

【摘要】 正八边形钢板腹梁是在钢圆环腹梁的基础上发展的一种新型空腹式钢结构桥梁。该结构是由具有正交加劲肋的顶底板、正八边形腹板单元和端部构件经高强螺栓装配组成。本文通过试验研究、有限元计算和理论分析,对正八边形钢板腹梁进行了约束扭转弹性分析。并对该结构的抗扭性能进行了大量参数分析,从而提出改进措施。本文的具体工作包含如下:1.对正八边形钢板腹梁开展了约束扭转弹性试验。研究了结构在弹性变形下顶板和腹板的应力分布规律,并根据挠度测量值计算主梁抗扭惯性矩。2.采用通用有限元软件ABAQUS建立三维板壳有限元模型。研究了正八边形钢板腹梁的抗扭力学特性,包括顶板和腹板的应力分布规律和主梁整体Mises应力分布规律。将试验数据和有限元结果进行对比分析,对有限元模型加以验证。3.分别采用剪切刚度等效原则和应变能等效原则将正八边形腹板连续化处理为均质等厚的钢薄板。基于乌氏第二理论,推导了正八边形钢板腹梁的约束扭转计算公式。4.建立了基于达索系统相关软件的参数分析模型框架。然后将其应用到正八边形钢板腹梁的抗扭参数分析实例中。选取该结构的重要参数,研究其对主梁抗扭性能的影响,从而指出相应的改进措施。5.基于参数分析,将理论计算结果和有限元计算结果进行对比,研究了约束扭转效应的影响程度随参数变化的规律,对等效板厚公式进行了简化。最后指出该参数分析模型框架对结构参数化设计与分析的重要性及其与BIM的联系。更多还原

【Abstract】 The steel octagon-web beam(SOWB)is a new type of open web steel bridge developed on the basis of steel ring-web beam.SOWB is composed of top and bottom plates with orthogonal stiffening ribs,regular octagonal web units and end members assembled by high-strength bolts.In this paper,by means of experimental research,finite element calculation and theoretical analysis,the constrained torsion elastic analysis of SOWB is carried out.A large number of parameter analysis of the constrained torsion of SOWB is carried out,and the improvement measures are proposeed.The specific work of this paper includes the following:1.The experimental research on constrained torsional elasticity of SOWB is carried out.The stress distribution of the deck and web under elastic deformation is studied,and the torsional moment of inertia of the main girder is calculated according to the measured deflection.2.The FEA software ABAQUS is used to establish three-dimensional finite element model of shell.The mechanical properties of torsion resistance of SOWB are studied,including the stress distribution rule of deck and web and the overall Mises stress distribution rule of the girder.Compare the experimental data and the FEA results to verify the finite FEA model.3.The SOWB is treated as a homogeneous steel plate by using the shear stiffness equivalent principle and strain energy equivalent principle respectively.Based on the Umansky’s second theory,the calculation formula for restrained torsion of SOWB are derived.4.The framework of parameter analysis model based on softwares of Dassault Systèmes is established.Then it is applied to the example of constrained torsional parameter analysis of SOWB.The important parameters of the structure are selected to study the influence of the parameters on the torsion resistance of the main girder,and the improvement measures are pointed out.5.Based on parameter analysis,the theoretical calculation results are compared with the FEA results.The law of effect of constrained torsion varying with parameters is analyzed.The equivalent plate thickness formula is simplified.Finally,the importance of the parametric analysis model framework for structural parametric design and analysis and its relationship with BIM are pointed out.更多还原