输电塔T形组合角钢加固方法试验研究
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摘要
近年来我国沿海地区频繁发生台风等自然灾害,造成输电线路不同程度的受损。因此,研究输电塔原位加固方法,提高在役输电塔抗风承载能力,具有十分重要的研究意义和价值。对于输电塔薄弱杆件为斜材的情况,提出了采用T形组合角钢的加固方法,分别设计了构件试验与塔段试验进行验证。结果表明:采用该种方法可以有效提高输电塔刚度与承载能力,构件承载能力提高97. 06%,塔段抗侧向位移刚度提高24. 7%,塔段承载能力提高88. 7%,塔段的破坏方式发生变化,薄弱部位发生转移。
In recent years,natural disasters such as typhoons have frequently occurred in coastal areas of China,causing damage to transmission lines in varying degrees. Hence,the research on on-site reinforcement methods of transmission towers and improving the wind resistance capability of towers are increasingly meaningful and valuable.In the case that the vulnerable members are diagonal members,a reinforcement methodology was adopted by using Tshaped combined angles,the experiments were conducted on angle members and tower substructure. The results verified the efficiency of the methodology that the bearing capacity of angle member increased by 97. 06%,stiffness of substructure increased by 24. 7% and the bearing capacity of tower substructure increased by 88. 7%. The failure mode of the tower substructure was changed due to the change of weak parts.
In recent years,natural disasters such as typhoons have frequently occurred in coastal areas of China,causing damage to transmission lines in varying degrees. Hence,the research on on-site reinforcement methods of transmission towers and improving the wind resistance capability of towers are increasingly meaningful and valuable.In the case that the vulnerable members are diagonal members,a reinforcement methodology was adopted by using Tshaped combined angles,the experiments were conducted on angle members and tower substructure. The results verified the efficiency of the methodology that the bearing capacity of angle member increased by 97. 06%,stiffness of substructure increased by 24. 7% and the bearing capacity of tower substructure increased by 88. 7%. The failure mode of the tower substructure was changed due to the change of weak parts.
引文
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[13]张戬,谢强.输电塔T形组合角钢加固构件承载性能试验研究[C]//全国结构工程学术会议论文集.西安:2018.
[2]谢强,张勇,李杰.华东电网500 kV任上5237线飑线风致倒塔事故调查分析[J].电网技术,2006,30(10):59-63.
[3]中国工程建设标准化协会.钢结构加固技术规范:CECS 77∶1996[S].北京:中国计划出版社,2005.
[4]谢强,阎启,李杰.横隔面在高压输电塔抗风设计中的作用分析[J].高电压技术,2006,32(4):1-4.
[5]孙力.覆冰荷载作用下高压输电塔结构破坏机理研究[D].上海:同济大学,2009.
[6]谢强,孙力,林韩,等.500 kV输电杆塔结构抗风极限承载力试验研究[J].高电压技术,2012,38(3):712-719.
[7]SMITH E A.Buckling of Four Equal-Leg Angle Cruciform Columns[J].Journal of Structural Engineering,1983,109(2):439-450.
[8]TAHIR M M,SHEK P N,SULAIMAN A,et al.Experimental Investigation of Short Cruciform Columns Using Universal Beam Sections[J].Construction&Building Materials,2009,23(3):1354-1364.
[9]俞登科,李正良,杨隆宇,等.Q420双角钢组合截面偏压构件弹塑性弯曲屈曲[J].土木建筑与环境工程,2012,34(5):12-16.
[10]沈之容,苑士岩.负载下焊接加固铁塔角钢轴压构件的受力性能[J].同济大学学报(自然科学版),2018,46(1):20-29.
[11]中华人民共和国住房和城乡建设部.钢结构设计标准:GB50017-2017[S].北京:中国建筑工业出版社,2017.
[12]国家能源局.架空输电线路杆塔结构设计技术规定:DL/T5154-2012[S].北京:中国计划出版社,2012.
[13]张戬,谢强.输电塔T形组合角钢加固构件承载性能试验研究[C]//全国结构工程学术会议论文集.西安:2018.