CAJ | 학술논문

以伊克昭大桥大矢跨比钢箱拱肋吊装为工程背景，对1/2拱肋单吊点起吊方案吊点位置选取进行了对比分析，提出了较合理的单吊点位置方案；同时，针对不同的风荷载工况，对1/2拱肋起吊过程中拱肋的整体稳定性进行了有限元分析，结论表明：风速越大，拱肋整体稳定安全系数越小；随着风速增加，拱肋非线性特征逐渐明显，当风速达到一定数值时，拱肋将发生不同形式的失稳破坏。横向风荷载作用时，拱肋失稳以弯剪耦合为主；纵向风荷载作用下，拱肋失稳以弯扭耦合为主。
이이극소대교대시과비강상공륵조장위공정배경，대1/2공륵단조점기조방안조점위치선취진행료대비분석，제출료교합리적단조점위치방안；동시，침대불동적풍하재공황，대1/2공륵기조과정중공륵적정체은정성진행료유한원분석，결론표명：풍속월대，공륵정체은정안전계수월소；수착풍속증가，공륵비선성특정축점명현，당풍속체도일정수치시，공륵장발생불동형식적실은파배。횡향풍하재작용시，공륵실은이만전우합위주；종향풍하재작용하，공륵실은이만뉴우합위주。
Based on the hoisting process of big rise-span ratio steel box arch rib of Yike Zhao bridge,comparison and analysis have been done for 1/2 single arch rib hoisting lifting scheme selection of hoisting position and a more reasonable single hanging point scheme is put forward.At the same time,according to different load condi-tions,the finite element analysis has been made for the overall stability of 1/2 arch rib in the lifting process.Re-sults show that the greater the wind speed,the smaller the overall stability safety factor of the arch rib.As the wind speed increases,nonlinear characteristics of arch rib becomes obvious;when the wind speed reaches a cer-tain value,instability failure of arch rib will occur in different forms.under lateral wind loads,curved scissors coupling plays a dominant role in arch rib instability;under vertical wind loads,bending tensional coupling plays a dominant role in arch rib instability.