（1 南昌大学工程力学研究所， 南昌 330031； 2 东华理工大学建筑工程学院， 南昌 330013; 3 九江学院土木工程与城市建设学院， 九江 332005）

［摘要］工程实际中输电塔角钢往往发生失稳破坏，因此，研究输电塔角钢的抗失稳能力显得尤为重要。通过比较60°角钢和90°角钢截面的两主惯性矩之比，可知60°角钢截面两主惯性矩相差不大，故其截面的抗失稳能力可以得到充分发挥，且60°角钢作为主材不仅可以解决三角形电塔主材与斜材连接不便的问题，而且其抗失稳能力可以在三角形电塔中充分发挥。因此从理论上比较了60°角钢三角形电塔和90°角钢四边形电塔的抗失稳能力，并通过模型试验、有限元数值模拟进行验证。研究结果表明，在相同用材情况下，60°角钢三角形电塔在抗压、抗弯及抗扭承载能力方面远比90°角钢四边形电塔的承载能力高，且整体稳定性也明显优于90°角钢四边形电塔。

［关键词］60°角钢；  90°角钢； 抗失稳能力； 主惯性矩； 模型试验

中图分类号：TU323-4文献标识码：A文章编号：1002-848X(2018)22-0033-09

Contrast of stability analysis between triangular steel pylon of 60° angle steels and quadrilateral steel pylon of 90° angle steels

Zhao Tengfei1, Yang Feng2, Zhang Lei1,3, Huang Mojia1

(1 Institute of Engineering Mechanics, Nanchang University, Nanchang 330031, China;2 School of Civil & Architecture Engineering, East China Institute of Technology, Nanchang 330013, China;3 School of Civil Engineering and City Construction of Jiujiang University, Jiujiang 332005, China)

Abstract:In engineering practice, angle steel of steel pylons often faces instability damage, so it is important to study the anti-instability ability of the angle steel of steel pylons. By comparing two principal inertia moments in transverse cross-section of  60° angle and  90° angle steels, two principal inertia moments in transverse cross-section of 60° angle steel are similar, so the anti-instability ability of the cross-section can get into full use, and 60° angle steel was used as primary-material, which can solve the connection problem between primary-material and inclined-bar in triangle steel pylons, and its anti-instability ability can be fully developed in triangle steel pylons. Therefore, the anti-instability abilities of the triangle steel pylon of 60° angle steel and the quadrilateral steel pylon of 90° angle steel were compared, and certified by the model test and the finite element numerical simulation. The results show that under condition of the same material consumption, the triangular steel pylon of 60° angle steel is much higher than the quadrilateral steel pylon of 90° angle steel in the compression, bending and torsional bearing capacity, and the overall stability of the triangular steel pylon of 60° angle steel is also better than that of  the quadrilateral steel pylon of 90° angle steel.

Keywords:60° angle steel; 90° angle steel;  anti-instability ability; principal inertia moment; model test

*国家自然科学基金项目(11572147,51268043,51568046)，江西省教育厅科学技术研究项目(GJJ150575)，江西省自然科学青年基金(20161BAB216142)，九江学院校级科研资助项目(8820109)。

通讯作者：黄模佳，博士，教授，博士生导师，Email：mojiahuang@hotmail.com。