构造节点的精细模拟及其在输电铁塔结构分析中的应用
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摘要
铁塔是输电线路的重要组成部分,其承载能力对于输电线路的正常运行起着重要作用。为了制造和安装方便,输电铁塔多采用热轧等边角钢构件通过螺栓连接而成,不同的节点构造方式将会影响其承载能力,因此在输电铁塔结构分析时,有必要研究如何考虑构造节点的影响,更加准确地预测铁塔的失效位置及失效载荷,给出不同工况下的极限承载力,这对于提高输电铁塔的设计水平,保障输电线路安全运行具有重要的理论价值和现实意义。
本论文对输电铁塔中典型节点的构造形式进行了分析,给出了构造节点的精细模拟方法,建立了220kV重冰塔的有限元模型,研究了该塔的非线性静力性能、承受基础变形能力以及断线冲击时的动力响应,通过对多种节点简化模型计算结果的对比,总结了构造节点对输电铁塔静动态特性的影响规律。本论文的具体研究内容如下：
1)详细分析了输电铁塔中普遍采用的普通螺栓抗剪连接的滑移过程,提出了一种新的螺栓连接滑移模型,研究了模型各参数的影响,并给出了各参数的取值。
2)采用弹簧模拟连接滑移及连接刚度,给出了输电铁塔中构造节点的精细模拟方法,根据是否考虑连接滑移和连接偏心以及不同的节点连接刚度,建立了四种220kV重冰塔的有限元模型。
3)研究了连接滑移、连接偏心以及连接刚度对输电铁塔内力及变形的影响,总结了不同的节点简化方法对铁塔非线性静力性能的影响规律,通过与真型塔试验结果的对比,证明了全面考虑构造节点的影响,能够较为准确地预测铁塔的载荷-位移全过程。
4)考虑构造节点的影响,研究了煤矿开采过程中输电铁塔内力及变形的变化过程,总结了构造节点对铁塔承受基础变形能力的影响规律,分析了杆件的破坏顺序,给出了铁塔的最大可承受基础变形量。
5)考虑导线和地线对铁塔的支持作用,建立了输电线路的等效分析模型,对输电铁塔在断边导线和断中导线时的动力响应进行了分析,研究了不同的节点简化方法对输电铁塔动态特性的影响。
Transmission towers are vital components of overhead transmission lines, which play an important role in the operation of electrical power systems. In order to store, transport and fabricate conveniently, lattice transmission towers are commonly constructed by hot-rolled equilateral angle steel struts through bolted joint. Because the way joins are structured will effect the bearing capacity of lattice transmission tower, so it is necessary to study how to including the joint effects in the lattice tower analysis. Accurate prediction of failure sequence and ultimate load of lattice transmission tower in various working conditions is very important for the reliability and safety of transmission lines.
In this paper an accurate modeling method for bolted joint in lattice transmission tower is presented, several numerical models of a new 220kV anti-icing tower with considering joint effects are created to study the non-linear static behavior, bearing capacity subject to ground deformation and dynamic response of lattice transmission tower, and the infulence of joint effects on the mechanical behavior of transimission towers is obtained. The contents of this paper as follow:
1) The slip process of bearing type bolted joint in lattice transmission tower is analyzed, a new joint slippage model is presented, and the parameters are determined after discussing their effects on the slippage model.
2) Joint slippage and joint stiffness are accurate modelled by using six nonlinear springs, four numerical models of a new 220kV anti-icing tower are built according to whether including joint slippage, joint eccentricity and various joint stiffness.
3)The effects of joint slipage, joint eccentricity and joint stiffness on the internal force and deformation of lattice tower are studied, experimental results from full-scale prototype tests are used in the comparison and show that load-deformation process of lattice transmission tower can be predicte accurately with considering all the joint effects.
4) The changing process of inner forces and deformation of lattice transmission tower are analysed with considering joint effects, the the infulunce of bolted joint on the lattice transmission tower subject to ground deforamtion are disscussed and the maximum magnitude of ground deforamtion and the failure sequence of members are presented.
5) The equivalent model of transmission lines are presented with considering conductor and ground wire suporting effects, and the dynamic response of the lattice tower subject to break of middle and side conductor are analyzed and the infulunce of joint effects on dynamic response are presented.
本论文对输电铁塔中典型节点的构造形式进行了分析,给出了构造节点的精细模拟方法,建立了220kV重冰塔的有限元模型,研究了该塔的非线性静力性能、承受基础变形能力以及断线冲击时的动力响应,通过对多种节点简化模型计算结果的对比,总结了构造节点对输电铁塔静动态特性的影响规律。本论文的具体研究内容如下：
1)详细分析了输电铁塔中普遍采用的普通螺栓抗剪连接的滑移过程,提出了一种新的螺栓连接滑移模型,研究了模型各参数的影响,并给出了各参数的取值。
2)采用弹簧模拟连接滑移及连接刚度,给出了输电铁塔中构造节点的精细模拟方法,根据是否考虑连接滑移和连接偏心以及不同的节点连接刚度,建立了四种220kV重冰塔的有限元模型。
3)研究了连接滑移、连接偏心以及连接刚度对输电铁塔内力及变形的影响,总结了不同的节点简化方法对铁塔非线性静力性能的影响规律,通过与真型塔试验结果的对比,证明了全面考虑构造节点的影响,能够较为准确地预测铁塔的载荷-位移全过程。
4)考虑构造节点的影响,研究了煤矿开采过程中输电铁塔内力及变形的变化过程,总结了构造节点对铁塔承受基础变形能力的影响规律,分析了杆件的破坏顺序,给出了铁塔的最大可承受基础变形量。
5)考虑导线和地线对铁塔的支持作用,建立了输电线路的等效分析模型,对输电铁塔在断边导线和断中导线时的动力响应进行了分析,研究了不同的节点简化方法对输电铁塔动态特性的影响。
Transmission towers are vital components of overhead transmission lines, which play an important role in the operation of electrical power systems. In order to store, transport and fabricate conveniently, lattice transmission towers are commonly constructed by hot-rolled equilateral angle steel struts through bolted joint. Because the way joins are structured will effect the bearing capacity of lattice transmission tower, so it is necessary to study how to including the joint effects in the lattice tower analysis. Accurate prediction of failure sequence and ultimate load of lattice transmission tower in various working conditions is very important for the reliability and safety of transmission lines.
In this paper an accurate modeling method for bolted joint in lattice transmission tower is presented, several numerical models of a new 220kV anti-icing tower with considering joint effects are created to study the non-linear static behavior, bearing capacity subject to ground deformation and dynamic response of lattice transmission tower, and the infulence of joint effects on the mechanical behavior of transimission towers is obtained. The contents of this paper as follow:
1) The slip process of bearing type bolted joint in lattice transmission tower is analyzed, a new joint slippage model is presented, and the parameters are determined after discussing their effects on the slippage model.
2) Joint slippage and joint stiffness are accurate modelled by using six nonlinear springs, four numerical models of a new 220kV anti-icing tower are built according to whether including joint slippage, joint eccentricity and various joint stiffness.
3)The effects of joint slipage, joint eccentricity and joint stiffness on the internal force and deformation of lattice tower are studied, experimental results from full-scale prototype tests are used in the comparison and show that load-deformation process of lattice transmission tower can be predicte accurately with considering all the joint effects.
4) The changing process of inner forces and deformation of lattice transmission tower are analysed with considering joint effects, the the infulunce of bolted joint on the lattice transmission tower subject to ground deforamtion are disscussed and the maximum magnitude of ground deforamtion and the failure sequence of members are presented.
5) The equivalent model of transmission lines are presented with considering conductor and ground wire suporting effects, and the dynamic response of the lattice tower subject to break of middle and side conductor are analyzed and the infulunce of joint effects on dynamic response are presented.
引文
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