(1 西安理工大学水利水电学院, 西安 710048; 2 西北旱区生态水利国家重点实验室, 西安 710048;3 西安理工大学土木建筑工程学院, 西安 710048)

摘要: 针对输电塔加固的现实需求,提出了一种新型角钢 T 形组合截面原位加固方案。 设计了 9 个压弯构件,试验研究了长细比、夹具数量、螺栓排数等参数对角钢 T 形组合截面构件破坏模式和承载性能等的影响规律。 结果表明:加固后构件极限承载力提高 57% ~ 82%;长细比与极限承载力之间呈明显的负相关关系;夹具位置靠近构件中部加固效果较好;双排螺栓加固效果优于单排螺栓;采用《架空输电线路杆塔结构设计技术规定》 (DL/ T 5154—2012)预测的构件承载力较试验结果保守,为此给出了一种适用于预测组合截面构件极限承载力的计算方法。

关键词: 角钢; T 形组合截面; 承载力; 压弯构件; 输电塔; 加固

中图分类号:TU391 文献标志码:A 文章编号: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

∗国家自然科学基金项目(51978571),中国博士后科学基金(2022M712562),陕西省自然科学基金项目(2020JQ-628),陕西省教育厅项目(21JK0795)。

第一作者:刘云贺,博士,教授,博士生导师,主要从事防灾减灾、结构抗震、水工沥青混凝土、土石坝安全控制理论等方面的研究,Email:liuyunhe1968@ 163. com。

[引用本文] 刘云贺,辛振科,梁刚,等. 角钢 T 形组合截面压弯构件受力性能试验研究[ J]. 建筑结构,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.