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（1 南昌大學(xué)工程力學(xué)研究所， 南昌 330031； 2 東華理工大學(xué)建筑工程學(xué)院， 南昌 330013; 3 九江學(xué)院土木工程與城市建設(shè)學(xué)院， 九江 332005）
［摘要］工程實際中輸電塔角鋼往往發(fā)生失穩(wěn)破壞，因此，研究輸電塔角鋼的抗失穩(wěn)能力顯得尤為重要。通過比較60°角鋼和90°角鋼截面的兩主慣性矩之比，可知60°角鋼截面兩主慣性矩相差不大，故其截面的抗失穩(wěn)能力可以得到充分發(fā)揮，且60°角鋼作為主材不僅可以解決三角形電塔主材與斜材連接不便的問題，而且其抗失穩(wěn)能力可以在三角形電塔中充分發(fā)揮。因此從理論上比較了60°角鋼三角形電塔和90°角鋼四邊形電塔的抗失穩(wěn)能力，并通過模型試驗、有限元數(shù)值模擬進(jìn)行驗證。研究結(jié)果表明，在相同用材情況下，60°角鋼三角形電塔在抗壓、抗彎及抗扭承載能力方面遠(yuǎn)比90°角鋼四邊形電塔的承載能力高，且整體穩(wěn)定性也明顯優(yōu)于90°角鋼四邊形電塔。
［關(guān)鍵詞］60°角鋼； 90°角鋼； 抗失穩(wěn)能力； 主慣性矩； 模型試驗
中圖分類號：TU323-4文獻(xiàn)標(biāo)識碼：A文章編號：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
*國家自然科學(xué)基金項目(11572147,51268043,51568046)，江西省教育廳科學(xué)技術(shù)研究項目(GJJ150575)，江西省自然科學(xué)青年基金(20161BAB216142)，九江學(xué)院校級科研資助項目(8820109)。
通訊作者：黃模佳，博士，教授，博士生導(dǎo)師，Email：mojiahuang@hotmail.com。
