采动区送电线路铁塔力学计算模型及塔－线体系共同作用机理研究
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摘要
送电线路铁塔的连接滑移和节点弹性,一直以来都被公认为是影响送电线路铁塔受力特性的主要因素。随着地下资源开发和地下空间利用呼声的提高,开展采动区铁塔力学计算模型和塔-线体系共同作用机理方面的研究,对于上部结构的安全性和地下空间资源的可用性具有重要的指导意义。
通过滑移性能试验,针对单个螺栓和两个螺栓连接节点,研究了螺栓连接的荷载-位移相关关系、螺栓连接滑移机理和螺栓连接节点的破坏形态,同时,导出了有滑移杆件的轴向刚度。
基于模糊数学的隶属度概念,从节点的弹性位移着手实现节点的模糊转角,推导了空间弹性梁单元的单刚矩阵,给出了模糊转角位移的隶属度与弹簧刚度的映射关系。借助MATLAB软件,引入有滑移杆件的轴向刚度折减系数,编制了考虑滑移的空间弹性节点模型(SFJS)源程序,对一JJ3型送电线路铁塔在支座不均匀沉降作用下主材和斜材的轴向力分布规律进行了数值分析,并与足尺寸铁塔试验结果进行比较。相比传统的刚架模型,考虑滑移的空间弹性节点模型的计算结果与试验吻合较好,能准确地反映地表变形作用下送电线路铁塔杆件的内力,验证了SFJS源程序的可靠性。考虑滑移的空间弹性节点模型对位于采动区送电线路铁塔的设计、计算和保护提供了理论依据。
借助矿区沉陷预测预报系统—MSPS,对地下开采引起的动态地表变形进行了预计。并建立塔-线体系三维有限元模型,考虑了既定塔-线体系下方不同工作面布置对导、线应力和弧垂、铁塔杆件内力、支座反力和塔顶综合位移进行了系统研究,提出了地下开采过程中塔-线体系的共同作用机理。针对工作面推进方向与线路方向的三种关系,对塔-线体系进行了安全评价,同时给出了相应的评价指标。在此基础上,提出了已建塔-线体系工作面布置原则及纠偏加固改造技术和采动区新建塔-线体系设计建议。
Connection slippage and joint flexibility of tower are widely regarded as major influencing factors for its mechanic performance. As the improvement of tendency to underground resource and space development, mechanic model of transmission line steel tower and interaction mechanism of tower-line system is great significant to the realiability of superstructure and availability of underground resource.
For one bolt and two bolts connection joint, load-displacement curve, slippage mechanism of bolt connection and failure mode of bolt joint were studied by using slippage performance test, and axial stiffness of member with slippage was presented.
Based on the concept of fuzzy membership, using spring to achieve fuzzy rotation angle of joint through its flexible displacement, element stiffness matrix of space flexible beam was derived and the relationship between fuzzy rotation and spring stiffness was provided. Introduced the axial stiffness reduction coefficient, the source code on space flexible joint model with slippage (SFJS) was programmed using MATLAB and perform numerical analysis to obtain the axial force of legs and diagonals of JJ3-type transmission line steel tower. The numerical results compared fairly well with full-scale test results and verify the reliability of space flexible joint model with slippage which can solve the internal force distribution of bar of transmission line steel tower and more accurately than traditional space frame model. The SFJS provide theoretical foundation for the design, calculation and protection of transmission line steel tower located at mining area.
Dynamic surface deformations were predicted using Mining Subsidence Prediction System (MSPS). Three-dimensional finite element model of tower-line system was built and perform study on stress and sag of conductor and lightning conductor, internal force of steel bar, bearing reaction and comprehensive displacement at tower top. Finally, interaction mechanism of tower-line system was provided. For three types relationship between workface tunneling direction and line, safety evaluation was conducted and give correspondent evaluation index. Based on workface layout principles, deviation rectification and strengthening reformation for existed tower-line system and design suggestion for newly-built tower-line system were presented.
通过滑移性能试验,针对单个螺栓和两个螺栓连接节点,研究了螺栓连接的荷载-位移相关关系、螺栓连接滑移机理和螺栓连接节点的破坏形态,同时,导出了有滑移杆件的轴向刚度。
基于模糊数学的隶属度概念,从节点的弹性位移着手实现节点的模糊转角,推导了空间弹性梁单元的单刚矩阵,给出了模糊转角位移的隶属度与弹簧刚度的映射关系。借助MATLAB软件,引入有滑移杆件的轴向刚度折减系数,编制了考虑滑移的空间弹性节点模型(SFJS)源程序,对一JJ3型送电线路铁塔在支座不均匀沉降作用下主材和斜材的轴向力分布规律进行了数值分析,并与足尺寸铁塔试验结果进行比较。相比传统的刚架模型,考虑滑移的空间弹性节点模型的计算结果与试验吻合较好,能准确地反映地表变形作用下送电线路铁塔杆件的内力,验证了SFJS源程序的可靠性。考虑滑移的空间弹性节点模型对位于采动区送电线路铁塔的设计、计算和保护提供了理论依据。
借助矿区沉陷预测预报系统—MSPS,对地下开采引起的动态地表变形进行了预计。并建立塔-线体系三维有限元模型,考虑了既定塔-线体系下方不同工作面布置对导、线应力和弧垂、铁塔杆件内力、支座反力和塔顶综合位移进行了系统研究,提出了地下开采过程中塔-线体系的共同作用机理。针对工作面推进方向与线路方向的三种关系,对塔-线体系进行了安全评价,同时给出了相应的评价指标。在此基础上,提出了已建塔-线体系工作面布置原则及纠偏加固改造技术和采动区新建塔-线体系设计建议。
Connection slippage and joint flexibility of tower are widely regarded as major influencing factors for its mechanic performance. As the improvement of tendency to underground resource and space development, mechanic model of transmission line steel tower and interaction mechanism of tower-line system is great significant to the realiability of superstructure and availability of underground resource.
For one bolt and two bolts connection joint, load-displacement curve, slippage mechanism of bolt connection and failure mode of bolt joint were studied by using slippage performance test, and axial stiffness of member with slippage was presented.
Based on the concept of fuzzy membership, using spring to achieve fuzzy rotation angle of joint through its flexible displacement, element stiffness matrix of space flexible beam was derived and the relationship between fuzzy rotation and spring stiffness was provided. Introduced the axial stiffness reduction coefficient, the source code on space flexible joint model with slippage (SFJS) was programmed using MATLAB and perform numerical analysis to obtain the axial force of legs and diagonals of JJ3-type transmission line steel tower. The numerical results compared fairly well with full-scale test results and verify the reliability of space flexible joint model with slippage which can solve the internal force distribution of bar of transmission line steel tower and more accurately than traditional space frame model. The SFJS provide theoretical foundation for the design, calculation and protection of transmission line steel tower located at mining area.
Dynamic surface deformations were predicted using Mining Subsidence Prediction System (MSPS). Three-dimensional finite element model of tower-line system was built and perform study on stress and sag of conductor and lightning conductor, internal force of steel bar, bearing reaction and comprehensive displacement at tower top. Finally, interaction mechanism of tower-line system was provided. For three types relationship between workface tunneling direction and line, safety evaluation was conducted and give correspondent evaluation index. Based on workface layout principles, deviation rectification and strengthening reformation for existed tower-line system and design suggestion for newly-built tower-line system were presented.
引文
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