基于新型夹具的双角钢十字组合构件偏压承载力研究  

Study on eccentric bearing capacity of double-angle steel cross compression member with innovative clamp

作　　者：梁刚[1,2] 李桂花 耿娜娜 刘云贺 杨迪雄[2] 田建渊 LIANG Gang;LI Guihua;GENG Nana;LIU Yunhe;YANG Dixiong;TIAN Jianyuan(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China;School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China;Shaanxi Galaxy Electric Power Tower Company Limited,Lintong 710608,China)

机构地区：[1]西安理工大学西北旱区生态水利工程国家重点实验室,陕西西安710048 [2]西安理工大学土木建筑工程学院,陕西西安710048 [3]陕西银河电力杆塔有限责任公司,陕西临潼710608

出　　处：《自然灾害学报》2022年第6期113-124,共12页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51978571,51722907);陕西省自然科学基金项目(2020JQ-628);陕西省教育厅项目(21JK0795)。

摘　　要：提高输电塔主材的承载能力,可有效地避免输电塔倒塌事故的发生。为研究新型夹具式加固方案的有效性,考虑加固后主材与加固材实际的受力特性,设计了7个基于新型夹具的双角钢十字组合构件,通过偏心受压试验对比分析了新型夹具式加固方案与常规加固方案下组合构件的承载性能,讨论了新型夹具上螺栓排数、夹具间距以及组合构件长细比等参数对新型十字组合构件的破坏模式、承载力以及应力分布规律的影响,并基于试验结果建立了数值分析模型。研究表明:新型十字组合构件大都发生主材角钢受压屈曲破坏,而夹具和螺栓等组件的变形不明显;新型夹具式加固方案在承载性能方面与一字板方案相似,十字组合构件的偏压承载力比单角钢构件提高约41%~62%;建议当长细比不小于48时,宜采用单排螺栓夹具连接主材与加固材;有限元计算结果与试验结果在破坏模式、荷载-位移曲线等方面吻合较好,可作为后续参数化分析的依据。研究成果可为类似输电塔加固工程提供试验和理论支撑。Improving the bearing capacity of the local stability of the main member of the transmission tower can effectively avoid its collapse. In order to study the effectiveness of the clamp-type reinforcement program,7 double angle cross composite members with innovative clamp(CMIC),considering the characteristics of the actual bearing force between the main member and the reinforcement one,were designed. Through the eccentric compression test,the bearing capacity of the CMIC is compared with that of the members with conventional component(CMCC),and the influence of the number of bolt rows on the clamp,the spacing of the clamp and the slender ratio of the composite member on the failure mode,bearing capacity and stress distribution of the CMIC is discussed. In addition,based on the experimental results,a numerical analysis model is established. The results show that the compression buckling failure occurs in the main component of the composite member,however,the deformation of clamps and bolts is not obvious. The new fixture reinforcement scheme is similar to the I-shaped plate scheme in terms of bearing performance,the eccentric bearing capacity of the CMIC is increased by 41%~62% compared with that of the single angle steel member. It is suggested that when the slenderness ratio of the CMIC is not less than 48,the innovative clamp with a single bolt row should be used to connect the main member and reinforcement one. The finite element calculation results are in good agreement with the test results in failure mode and load-displacement curve,which can be used as the basis for the subsequent parametric analysis. The research results can provide experimental and theoretical support for similar transmission tower reinforcement projects.

关 键 词：输电塔 新型夹具 十字组合构件 偏压承载力 设计规范 

分 类 号：TU391[建筑科学—结构工程]