输电杆塔连接节点螺栓应力研究
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摘要
研究了输电杆塔连接节点的螺栓强度问题。首先基于非线性有限元理论建立了输电塔线体系的力学模型和强风荷载作用下的运动方程;随后采用多节点实体单元建立了输电杆塔节点承载力的精细化有限元分析模型。在此基础上,建立了节点螺栓的预紧力计算方法和强度分析方法。以南方某输电线路为实际工程背景,研究强风作用下输电杆塔节点螺栓的服役强度,对比分析杆塔节点不同构件的应力状况。通过参数研究考察预紧力、摩擦系数以及螺栓直径等不同参数对其应力的影响特点。研究表明:强风荷载作用下节点螺栓承受很大应力,部分螺栓已经进入塑性阶段。螺栓预紧力和直径对其应力有很大的影响,而摩擦系数的影响则相对较小。
The bolt strength of joints of transmission tower was investigated in the study. The mechanical model and equation of motion of transmission tower-line system subjected to strong wind loads were established based on nonlinear finite element(FE) method. The fine FE analytical approach for the bearing capacity of tower joints was also developed by using multi-node solid elements. A real transmission tower-line system constructed in southern China was taken as an example to investigate the joint strength in service subjected to strong wind loads and to compare the stress characteristics of various components. The results showed that the tower joints had very large stresses under strong wind loads and some joints presented plastic properties. The effects of joint preload and diameter on stress were much larger in comparison with those of the friction coefficient.
The bolt strength of joints of transmission tower was investigated in the study. The mechanical model and equation of motion of transmission tower-line system subjected to strong wind loads were established based on nonlinear finite element(FE) method. The fine FE analytical approach for the bearing capacity of tower joints was also developed by using multi-node solid elements. A real transmission tower-line system constructed in southern China was taken as an example to investigate the joint strength in service subjected to strong wind loads and to compare the stress characteristics of various components. The results showed that the tower joints had very large stresses under strong wind loads and some joints presented plastic properties. The effects of joint preload and diameter on stress were much larger in comparison with those of the friction coefficient.
引文
[1] 陈波, 瞿伟廉, 郑瑾. 输电塔线体系风振反应的半主动摩擦阻尼控制技术[J]. 工程力学, 2009, 26(1): 221-226.
[2] 郭勇,姚耀明,陈金光,等.输电铁塔挂点结构承载力分析[J].钢结构,2016,31(8):67-70.
[3] 陈卫明, 陈卫国, 王鑫. 采动区地表变形对输电塔线体系的影响规律研究[J].钢结构, 2015,30(8): 38-42.
[4] 陈波, 郑瑾, 瞿伟廉. 基于磁流变阻尼器的大跨越输电塔线体系风致振动控制[J]. 振动与冲击, 2008, 27(3): 71-74.
[5] 李文斌,陈剑平. 单边连接等边角钢受压试验及有限元分析[J].钢结构,2018,33(8):24-28.
[6] CHEN B, ZHENG J, QU W L. Control of Wind-Induced Response of Transmission Tower-Line System by Using Magnetorhcological Dampers[J]. International Journal of Structural Stability and Dynamics, 2009, 9(4): 661-685.
[7] SHEHATA A Y, DAMATTY A A, SAVORY E. Finite Element Modeling of Transmission Line Under Downburst Wind Loading[J]. Finite Elements in Analysis and Design, 2005, 42(1): 71-89.
[8] 中华人民共和国建设部. 六角螺母:GB/T 6170—2000[S]. 北京:中国标准出版社, 2000.
[9] 赵喆. 大功率碟式太阳能热发电系统关键螺栓连接强度分析[D]. 长沙:湖南科技大学, 2015.
[10] 中华人民共和国住房和城乡建设部. 钢结构设计标准:GB 50017—2017[S]. 北京:中国建筑工业出版社, 2018.
[11] 陈长盛, 王强, 柳瑞锋, 等. 螺栓连接对结构模态及传递特性影响研究[J]. 振动与冲击, 2014(2): 178-182.
[12] 陈怡宏, 黄海斌, 张意, 等. 特高压输电塔K型节点受力性能有限元分析[J]. 重庆建筑, 2015(11): 51-53.
[13] 陈鑫. 钢管塔负偏心K型节点承载力试验与计算方法研究[D]. 北京:北京交通大学, 2014.
[14] 朱斌, 高强. 大跨越输电塔螺栓和法兰连接的有限元分析[J]. 苏州大学学报(工科版), 2011, 31(1): 43-46.
[15] 周星. 模拟参数和安装偏差对螺栓连接特性的影响研究[D].合肥:中国科学技术大学, 2014.
[16] 赵楠. 特高压输电塔半刚性连接节点受力性能及结构非线性分析研究[D]. 重庆:重庆大学, 2014.
[17] 国家能源局. 110～500 kV架空送电线路施工及验收规范:GB 50233—2005[S]. 北京:中国计划出版社, 2005.
[2] 郭勇,姚耀明,陈金光,等.输电铁塔挂点结构承载力分析[J].钢结构,2016,31(8):67-70.
[3] 陈卫明, 陈卫国, 王鑫. 采动区地表变形对输电塔线体系的影响规律研究[J].钢结构, 2015,30(8): 38-42.
[4] 陈波, 郑瑾, 瞿伟廉. 基于磁流变阻尼器的大跨越输电塔线体系风致振动控制[J]. 振动与冲击, 2008, 27(3): 71-74.
[5] 李文斌,陈剑平. 单边连接等边角钢受压试验及有限元分析[J].钢结构,2018,33(8):24-28.
[6] CHEN B, ZHENG J, QU W L. Control of Wind-Induced Response of Transmission Tower-Line System by Using Magnetorhcological Dampers[J]. International Journal of Structural Stability and Dynamics, 2009, 9(4): 661-685.
[7] SHEHATA A Y, DAMATTY A A, SAVORY E. Finite Element Modeling of Transmission Line Under Downburst Wind Loading[J]. Finite Elements in Analysis and Design, 2005, 42(1): 71-89.
[8] 中华人民共和国建设部. 六角螺母:GB/T 6170—2000[S]. 北京:中国标准出版社, 2000.
[9] 赵喆. 大功率碟式太阳能热发电系统关键螺栓连接强度分析[D]. 长沙:湖南科技大学, 2015.
[10] 中华人民共和国住房和城乡建设部. 钢结构设计标准:GB 50017—2017[S]. 北京:中国建筑工业出版社, 2018.
[11] 陈长盛, 王强, 柳瑞锋, 等. 螺栓连接对结构模态及传递特性影响研究[J]. 振动与冲击, 2014(2): 178-182.
[12] 陈怡宏, 黄海斌, 张意, 等. 特高压输电塔K型节点受力性能有限元分析[J]. 重庆建筑, 2015(11): 51-53.
[13] 陈鑫. 钢管塔负偏心K型节点承载力试验与计算方法研究[D]. 北京:北京交通大学, 2014.
[14] 朱斌, 高强. 大跨越输电塔螺栓和法兰连接的有限元分析[J]. 苏州大学学报(工科版), 2011, 31(1): 43-46.
[15] 周星. 模拟参数和安装偏差对螺栓连接特性的影响研究[D].合肥:中国科学技术大学, 2014.
[16] 赵楠. 特高压输电塔半刚性连接节点受力性能及结构非线性分析研究[D]. 重庆:重庆大学, 2014.
[17] 国家能源局. 110～500 kV架空送电线路施工及验收规范:GB 50233—2005[S]. 北京:中国计划出版社, 2005.