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(1 西安理工大學(xué)水利水電學(xué)院, 西安 710048; 2 西北旱區(qū)生態(tài)水利國家重點(diǎn)實(shí)驗(yàn)室, 西安 710048;3 西安理工大學(xué)土木建筑工程學(xué)院, 西安 710048)

摘要: 針對(duì)輸電塔加固的現(xiàn)實(shí)需求,提出了一種新型角鋼 T 形組合截面原位加固方案。 設(shè)計(jì)了 9 個(gè)壓彎構(gòu)件,試驗(yàn)研究了長細(xì)比、夾具數(shù)量、螺栓排數(shù)等參數(shù)對(duì)角鋼 T 形組合截面構(gòu)件破壞模式和承載性能等的影響規(guī)律。 結(jié)果表明:加固后構(gòu)件極限承載力提高 57% ~ 82%;長細(xì)比與極限承載力之間呈明顯的負(fù)相關(guān)關(guān)系;夾具位置靠近構(gòu)件中部加固效果較好;雙排螺栓加固效果優(yōu)于單排螺栓;采用《架空輸電線路桿塔結(jié)構(gòu)設(shè)計(jì)技術(shù)規(guī)定》 (DL/ T 5154—2012)預(yù)測的構(gòu)件承載力較試驗(yàn)結(jié)果保守,為此給出了一種適用于預(yù)測組合截面構(gòu)件極限承載力的計(jì)算方法。

關(guān)鍵詞: 角鋼; T 形組合截面; 承載力; 壓彎構(gòu)件; 輸電塔; 加固

中圖分類號(hào):TU391 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)24-0057-07

DOI:10. 19701 / j. jzjg. 20201381

Experimental study on mechanical behavior of angle steel T-shaped composite area press-bending members

LIU Yunhe1,2,3, XIN Zhenke1, LIANG Gang2,3, GUO Hongchao2,3, GENG Nana3

(1 Institute of Water Resources and Hydropower,Xi’ an University of Technology, Xi’ an 710048, China;2 State Key Laboratory of Eco-hydraulic in Northwest Arid Region, Xi’ an 710048, China;3 College of Civil and Architecture Engineering,Xi’ an University of Technology, Xi’ an 710048, China)

Abstract: According to the actual needs of transmission tower reinforcement, a new in-situ reinforcement scheme of anglesteel T-shaped composite area was proposed. Nine press-bending members were designed, and the effects of slenderness,the number of fixtures, the number of bolt rows and other parameters on the failure mode and bearing performance of anglesteel T-shaped composite area members were studied by test. The results show that the ultimate bearing capacity of thereinforced member is increases by 57% ~ 82%; there is an obvious negative correlation between the slenderness and theultimate bearing capacity; the reinforcement effect is better when the fixture is located near the middle of the member; thereinforcement effect of double-row bolts is better than that of single-row bolts; the predicted bearing capacity of the memberusing the Technical code for the design of tower and pole structures of overhead transmission line (DL/ T 5154—2012) isconservative compared with the test results, and a calculation method is given for predicting the ultimate bearing capacity ofthe combined area member.

Keywords: angle steel; T-shaped composite area; bearing capacity; press-bending member; transmission tower;reinforcement

∗國家自然科學(xué)基金項(xiàng)目(51978571),中國博士后科學(xué)基金(2022M712562),陜西省自然科學(xué)基金項(xiàng)目(2020JQ-628),陜西省教育廳項(xiàng)目(21JK0795)。

第一作者:劉云賀,博士,教授,博士生導(dǎo)師,主要從事防災(zāi)減災(zāi)、結(jié)構(gòu)抗震、水工瀝青混凝土、土石壩安全控制理論等方面的研究,Email:liuyunhe1968@ 163. com。

[引用本文] 劉云賀,辛振科,梁剛,等. 角鋼 T 形組合截面壓彎構(gòu)件受力性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2022,52(24):57-63. LIU Yunhe,XIN Zhenke,LIANG Gang, et al. Experimental study on mechanical behavior of angle steelT-shaped composite area press-bending members[J]. Building Structure,2022,52(24):57-63.