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（1 四川公路橋梁建設(shè)集團(tuán)有限公司， 成都 610093； 2 四川路橋華東建設(shè)有限公司， 成都 610500）

［摘要］結(jié)合某鋼筋加工場后期生產(chǎn)需要，對(duì)無制動(dòng)結(jié)構(gòu)鋼吊車梁進(jìn)行加固設(shè)計(jì)研究。通過建立合理的有限元模型，對(duì)3種加固方案進(jìn)行分析。結(jié)果表明，采用方案1（鋼支撐）加固，吊車梁不能滿足工作要求；采用方案2（向下加高200mm）和方案3（16mm平行板）加固，吊車梁強(qiáng)度、剛度和穩(wěn)定性均滿足設(shè)計(jì)規(guī)范要求。對(duì)方案2這類水平非對(duì)稱開口截面，雙力矩引起的正應(yīng)力不能忽視，其在彎扭耦合作用下的二次應(yīng)力效應(yīng)，造成有限元解與《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB 50018—2002）解的差異，但穩(wěn)定性偏安全。對(duì)方案3這類雙對(duì)稱閉口截面，可忽略雙力矩影響，強(qiáng)度和穩(wěn)定性方面，《鋼結(jié)構(gòu)設(shè)計(jì)標(biāo)準(zhǔn)》（GB 50017—2017）和《冷彎薄壁型鋼結(jié)構(gòu)技術(shù)規(guī)范》（GB 50018—2002）解均偏安全。最終采用方案2對(duì)吊車梁進(jìn)行加固，該加固措施能顯著提高吊車梁的力學(xué)性能，且施工便利，經(jīng)濟(jì)性好。

［關(guān)鍵詞］鋼吊車梁；加固；二次應(yīng)力效應(yīng)；力學(xué)性能

中圖分類號(hào)：TU313文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)04-0033-06

Study on mechanical properties of reinforce steel crane beam without brake structures based on ANSYS

TAO Long1,2, DENG Hengchang1,2, XU Guoting1,2, LI Qingpei1,2

(1 Sichuan Road and Bridge Group Co., Ltd., Chengdu 610093, China;2 Sichuan Road and Bridge East China Construction Co., Ltd., Chengdu 610500, China)

Abstract:The reinforcement design research of a steel crane beam without brake structure was studied according to the later production needs of a steel bar processing space. By establishing a reasonable finite element model, three reinforcement schemes were analyzed. The results show that the crane beam can′t meet the working requirements with scheme 1 (steel support),and  the strength, rigidity and stability of the crane beam can meet the requirements of design specifications with scheme 2 (increase 200mm downward) and scheme 3 (16mm parallel plate). The normal stress caused by double moments can′t be neglected for scheme 2—the horizontal asymmetric open section. The difference between the finite element solution and the solution of Technical code of cold-formed thin-wall steel structures (GB 50018—2002) is caused by the secondary stress effect for the scheme 2 by coupling bending and torsional load, however the stability solution is partial to safety. The  double moments can be neglected for scheme 3—double symmetric closed section. The strength and stability solutions of Standard for design of steel structures (GB 50017—2017) and Technical code of cold-formed thin-wall steel structures (GB 50018—2002) are safety. Finally, scheme 2 is adopted to strengthen the crane beam, which can significantly improve the mechanical properties of the crane beam, and the construction is convenient and economical.

Keywords:steel crane beam;reinforcement;secondary stress effect;mechanical property

作者簡介：陶龍，博士，工程師，Email:xionglong210@126.com。