张弦桁架索夹节点受力性能及其优化设计方法研究
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摘要
在张弦桁架结构中,索夹节点是保证拉索与主体钢结构之间协同工作的关键部分。以内蒙某工程为背景,对解决模拟索体柔性特征的方法进行了研究,并对索夹节点进行了ABAQUS有限元分析,提出了静力状态下传统索夹节点受力性能方面的不足,并对其受力性能优化设计方法进行了研究,分别针对索夹边缘倒角以及索夹与索体间的铝垫层对于索夹节点受力性能的影响进行了参数化分析。分析结果表明,使用几何构造优化与铝垫层优化两种优化措施对于索夹节点受力性能优化效果明显。倒角的尺寸在1/4~2/5拉索直径范围内时优化效果较好,拉索表面最大等效应力降低8%~11%;铝垫层厚度在1. 0~2. 5mm范围内时优化效果较好,拉索表面最大等效应力降低17%~19%;两种措施同时使用优化效果更佳,优化效果优于分别单独使用任何一种优化措施。
In the string truss structure,the cable clamp joint is a key part of ensuring the cooperative working between the cable and the main steel structure. Based on a project in Inner Mongolia,the method was studied to solve the flexible characteristics of the simulated cable body and ABAQUS finite element analysis was performed on the cable clamped joints.The insufficiency of the mechanical performance of traditional cable clamp joints under static state was proposed,and the mechanical performance optimization design method was studied. The parametric analysis of the influence of the cable clamp edge chamfer and the aluminum cushion between the cable clamp and the cable body on the force behavior of the cable clamp joints was carried out. Analysis results show that the optimization of the mechanical properties of the cable clamp joints is significantly improved by two optimization measures: geometric structure optimization and aluminum cushion optimization. If the chamfer size ranges between 1/4 ~ 2/5 of the cable diameter,the optimization effect is better,and the maximum equivalent stress of the cable surface is reduced by 8% ~ 11%. If the thickness of the aluminum cushion ranges between 1. 0 ~ 2. 5 mm,the optimization effect is better,and the maximum equivalent stress of the cable surface is reduced by 17% ~ 19%. It has better optimization effect when the two measures are used at the same time and the optimization effect is better than any single optimization measure separately.
In the string truss structure,the cable clamp joint is a key part of ensuring the cooperative working between the cable and the main steel structure. Based on a project in Inner Mongolia,the method was studied to solve the flexible characteristics of the simulated cable body and ABAQUS finite element analysis was performed on the cable clamped joints.The insufficiency of the mechanical performance of traditional cable clamp joints under static state was proposed,and the mechanical performance optimization design method was studied. The parametric analysis of the influence of the cable clamp edge chamfer and the aluminum cushion between the cable clamp and the cable body on the force behavior of the cable clamp joints was carried out. Analysis results show that the optimization of the mechanical properties of the cable clamp joints is significantly improved by two optimization measures: geometric structure optimization and aluminum cushion optimization. If the chamfer size ranges between 1/4 ~ 2/5 of the cable diameter,the optimization effect is better,and the maximum equivalent stress of the cable surface is reduced by 8% ~ 11%. If the thickness of the aluminum cushion ranges between 1. 0 ~ 2. 5 mm,the optimization effect is better,and the maximum equivalent stress of the cable surface is reduced by 17% ~ 19%. It has better optimization effect when the two measures are used at the same time and the optimization effect is better than any single optimization measure separately.
引文
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[2]张其林.建筑索结构的应用现状和研究进展[J].施工技术,2014,43(14):19-22.
[3]陆赐麟,尹思明,刘锡良.现代预应力钢结构[M].2版(修订本).北京:人民交通出版社,2007.
[4]沈世钊,武岳.结构形态学与现代空间结构[J].建筑结构学报,2014,35(4):1-10.
[5]刘锡良.三十年我国空间网格结构的发展[C]//第十四届空间结构学术会议论文集.福州,2012.
[6] ZIENKIEWICZ O C,TAYLOR R L,ZHU J Z. The finite element method:its basis and fundamentals[M]. 6th ed.Oxford:Elsevier Butterworth-Heinemann,2005.
[7] QIN Z Y,YAN S Z,CHU F L. Finite element analysis of the clamp band joint[J]. Applied Mathematical Modelling,2012,36(1):463-477.
[8]王永泉.常州体育馆索承单层网壳屋盖低摩阻可滑动铸钢索夹试验研究[J].建筑结构,2010,40(9):45-48.
[9]李宗凯.索体的抗弯刚度测定及实用简化[C]//第九届全国现代结构工程学术研讨会论文集.天津,2009.
[10]张福星.预应力撑杆柱索撑节点数值模拟和试验研究[D].镇江:江苏科技大学,2016.
[11]刘学春,张爱林,刘阳军,等.大跨度索穹顶新型索撑节点模型试验及性能分析[J].建筑结构学报,2012,33(4):46-53.
[12]陈耀,冯健.新广州站内凹式索拱结构索夹节点抗滑性能分析[J].建筑结构学报,2013,34(5):27-32.
[13]石景,张其林.铝合金屋面板承载力的数值模拟及试验研究[J].建筑结构,2006,36(S1):98-99,103.
[14]成大先.机械设计手册[M].5版.北京:化学工业出版社,2008.