抱杆结构整体稳定承载力分析研究
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摘要
随着铁塔高度的增高,抱杆高度也随之增加,其稳定问题尤为突出。为了深入研究抱杆结构的整体稳定性能,使用特征值屈曲方法在平衡吊重工况下分析抱杆结构临界荷载随各因素变化规律。同时,为考虑初始缺陷、不同加工条件等因素对结构稳定性能的影响,提出一种不平衡起吊稳定承载力简化计算方法,给出抱杆结构不平衡起吊整体稳定承载力计算式、步骤和各参数选取方法。该方法效率高,满足工程所需精度。通过对某一工程实例进行有限元分析,得到关键参数,将其代入整体稳定计算式,得到示例抱杆不平衡吊重为16.3 k N。
The height of holding poles increased with the increasing of tower height,stability problem is particularly prominent. In order to study the overall stability capacity of holding poles,eigenvalue method was used to analyze the variation of the critical load of the pole structure under the condition of balanced hoisting. A simplified method adopting inplane stability of eccentrically loaded built-up columns was proposed to determine the overall stability capacity under unbalanced hoisting conditions which could take initial imperfection into consideration. The calculation steps and selection method of each parameter were proposed in this paper. To improve computational efficiency,the finite element software was used for solving the key parameters,and substituted into the formulae,then the bearing capacity of the pole structures was obtained. The proposed method was applied to calculate the bearing capacity of the sample holding-pole. The results showed that the unbalanced load is 16. 3 k N.
The height of holding poles increased with the increasing of tower height,stability problem is particularly prominent. In order to study the overall stability capacity of holding poles,eigenvalue method was used to analyze the variation of the critical load of the pole structure under the condition of balanced hoisting. A simplified method adopting inplane stability of eccentrically loaded built-up columns was proposed to determine the overall stability capacity under unbalanced hoisting conditions which could take initial imperfection into consideration. The calculation steps and selection method of each parameter were proposed in this paper. To improve computational efficiency,the finite element software was used for solving the key parameters,and substituted into the formulae,then the bearing capacity of the pole structures was obtained. The proposed method was applied to calculate the bearing capacity of the sample holding-pole. The results showed that the unbalanced load is 16. 3 k N.
引文
[1]肖军利.复杂支承条件下特种空间杆系钢结构研究[D].南京:南京工业大学,2004.
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[3]隆嘉祥.桅杆结构整体稳定研究[D].上海:同济大学,2008.
[4]GB 50017—2003钢结构设计规范[S].
[5]林旭峰,申琳,陈厚飞,等.大型内悬浮外拉线抱杆的数值模拟[J].重庆理工大学学报:自然科学版,2010,24(2):59-63.
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[7]郝宏伟.40 m内悬浮内拉线摇臂抱杆力学性能研究[D].西安:西安建筑科技大学,2013.
[8]李金海,李世兵,张松林,等.考虑斜拉索刚度、垂度、阻尼的非线性运动方程研究[J].防灾减灾工程学报,2010,30(增刊):222-225.
[9]郭建斌,陈燊,卓文,等.桅杆结构静力整体稳定的非线性有限元分析[C]//第十二届全国结构工程学术会议论文集.2003:1212-1215.
[10]童根树,施祖元,李志飚,等.计算长度系数的物理意义及对各种钢框架稳定设计方法的评论[J].建筑钢结构进展,2004,6(4):1-8.
[11]CECS 102∶2002门式刚架轻型房屋钢结构技术规程[S].
[2]王肇民,王之宏,颜明忠.桅杆结构[M].北京:科学出版社,2001.
[3]隆嘉祥.桅杆结构整体稳定研究[D].上海:同济大学,2008.
[4]GB 50017—2003钢结构设计规范[S].
[5]林旭峰,申琳,陈厚飞,等.大型内悬浮外拉线抱杆的数值模拟[J].重庆理工大学学报:自然科学版,2010,24(2):59-63.
[6]路志浩,陈以一.一般情况下小垂度索的刚度方程及其应用[J].力学季刊,2000,21(2):254-261.
[7]郝宏伟.40 m内悬浮内拉线摇臂抱杆力学性能研究[D].西安:西安建筑科技大学,2013.
[8]李金海,李世兵,张松林,等.考虑斜拉索刚度、垂度、阻尼的非线性运动方程研究[J].防灾减灾工程学报,2010,30(增刊):222-225.
[9]郭建斌,陈燊,卓文,等.桅杆结构静力整体稳定的非线性有限元分析[C]//第十二届全国结构工程学术会议论文集.2003:1212-1215.
[10]童根树,施祖元,李志飚,等.计算长度系数的物理意义及对各种钢框架稳定设计方法的评论[J].建筑钢结构进展,2004,6(4):1-8.
[11]CECS 102∶2002门式刚架轻型房屋钢结构技术规程[S].