等腰三角形空间桁架自由扭转理论分析和试验研究

李天; 晁进涛; 樊嘉

doi:10.6052/j.issn.1000-4750.2017.12.0984

等腰三角形空间桁架自由扭转理论分析和试验研究

郑州大学土木工程学院, 郑州 450001

基金项目: 国家自然科学基金项目（51478437）；郑州市重大科技专项项目（152PZDZX033）

详细信息

作者简介:
李天(1960-),男,浙江人,教授,博士,博导,主要从事钢结构和组合结构研究(E-mail:litian@zzu.edu.cn);樊嘉(1989-),男,河南人,博士生,主要从事钢结构和组合结构研究(E-mail:zzufanjia@126.com)

通讯作者:
晁进涛(1986-),男,河南人,博士生,主要从事钢结构和组合结构研究(E-mail:04.tumu@163.com)

中图分类号: TU391
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- 文章访问数: 455
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- PDF下载量: 51
出版历程
- 收稿日期: 2017-12-25
- 修回日期: 2018-03-14
- 刊出日期: 2018-05-24

THEORETICAL AND EXPERIMENTAL STUDY ON FREE TORSION OF ISOSCELES TRIANGULAR SPACE TRUSS

School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

摘要

摘要: 为研究腹杆对称布置的等腰三角形空间桁架的抗扭性能，以经典的自由扭转理论为基础，根据自由扭转变形的特点对桁架扭转变形关系进行了简化。给出了桁架的扭心位置、弹性抗扭刚度和屈服扭矩的计算方法，并分析了桁架破坏的机理。为验证桁架抗扭性能的计算方法，进行了桁架的扭转试验，试验构件弹性抗扭刚度和屈服扭矩的计算值和试验值的误差均小于10%。运用有限元方法对试验构件和计算方法进行了模拟和验证。结果表明：该文方法的计算值、试验值和有限元分析数值符合良好，该文的研究为等腰三角形空间桁架自由扭转提供了一种实用计算方法。
- 空间桁架 /
- 自由扭转 /
- 等腰三角形 /
- 抗扭刚度 /
- 扭心 /
- 屈服扭矩 /
- 理论分析 /
- 试验研究
Abstract: On the basis of classical theory of free torsion and the deformation characteristics of a truss, the torsional deformation is simplified to study the torsional behaviors of isosceles triangular space trusses with symmetrically-distributed web members. The methods of calculating torsional center, elastic torsional stiffness, and yield torque of a truss are proposed, and the mechanism of truss failure is analyzed. In order to verify the calculation method of the torsional behaviors of a truss, the torsional test of a truss is done, and the error between the value of calculating elastic torsional stiffness and the test value of the test member is less than 10%, the same as a yield torque. The Finite Element Method (FEM) is employed to simulate and verify the test member and calculation method. The results show that the calculation values, test values and FEM values are well consistent with each other. A practical calculation method is proposed for the free torsion of isosceles triangular space trusses.
- space truss /
- free torsion /
- isosceles triangle /
- torsional stiffness /
- torsion center /
- yield torque /
- theoretical analysis /
- experimental study

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