Research and Applications on Thermal-mechanical Problems of Overhead Conductors

热力耦合问题是非常普遍的工程问题。在许多实际问题的计算分析中，温度场、位移场以及应力场之间的耦合是非常重要的。解决这类问题的关键在于准确模拟温度场和温度应变（热胀/冷缩）以及位移场与传热参数之间的耦合关系。本文主要研究自然运营条件下架空导线的温度场、应力、弧垂以及温度拐点的计算方法和变化规律。 本文旨在准确计算架空导线在运营条件下的温度、应力、弧垂以及拐点温度，这对于确保输送电能最大化的情况下，保证架空线的强度和弧垂安全具有重要的意义。本文提出了一套完整的基于架空导线细观温度场和分层应力求解导线拐点温度的数值计算方法，即先利用有限元法求解考虑孔隙的细观温度场，再求解导线分层应力和弧垂特性，其...The thermal coupling problems are very common engineering problems. In the calculation and analysis of many practical engineering problems, the coupling between the temperature, displacement and the stress fields cannot be ignored. To solve these kinds of problems, the coupling relationships between the temperature field, thermal strain (expansion/ contraction due to temperature changes), displace...学位：工学硕士院系专业：建筑与土木工程学院_工程硕士(建筑与土木工程)学号：2532013115181

Numerical Simulation of Radial Temperature Field of Overhead Conductors

基于二维稳态热传导控制方程,考虑了输电导线主要的发热源和散热途径,形成了一套准确的导线径向温度场数值求解方法,并通过实例应用于Jl/lb1A-300/50型钢芯铝绞线。结果验证了导线径向温度差的真实存在且不可简单忽略,并且径向温度分布受导线内不同金属材料的单位体积发热率、绞线间接触情况和外界对流等多方面因素的共同影响。To accurately simulate the radial temperature field of conducts,a numerical method was proposed based on2Dsteady-state heat transfer control functions,in which the main heat gains and heat loss of conducts were considered,and then applied to the type-JL/LB1A-300/50 aluminum conductor steel reinforced(ACSR)conductor.The experimental results show that temperature difference in radial direction of conducts is significant,which can not be simply neglected.Furthermore,the effects of the thermal conductivity of metal materials in conductors,the contact conditions among strands and the external convections on the temperature field were also studied.广州电网公司科技项目(K-GD2014-0596002-001

新型二维轮轨耦合单元及OpenSees实现

基于轮轨竖向非线性接触关系,提出一种新型通用二维轮轨耦合单元模型,并在有限元OpenSees软件平台上实现。所提单元由轮节点和所有可能与之接触的梁单元节点组成,通过建立和求解关于轮轨作用力的一元三次方程,得到轮轨之间的接触力,计算由轮轨相互作用产生的耦合单元各节点力,定义为单元内力。通过与文献中计算结果对比,验证了该单元模型的准确性和可靠性,基于此模型分析高速列车通过桥梁时在轨道不平顺激励和地震作用下的动力响应。此耦合单元模型易于集成到有限元计算平台中,能与已有的列车模型、轨道和桥梁等模型联合使用,能够考虑轨道不平顺和轮轨脱离等情况,可用来分析复杂竖向车桥耦合系统的动力问题。国家重点研发计划(2016YFC0701106);;国家自然科学基金(51578473);;厦门市交通基础设施智能管养工程技术研究中心开放基金(TCIMI201801