CAJ | 학술논문

针对目前加固技术对改善大跨度连续箱梁桥承载能力有限等情况，引入非自平衡张弦梁结构（NSE‐BSS ），对大跨度连续箱梁桥非自平衡张弦梁结构（NSE‐BSS）加固方案进行研究。NSE‐BSS由上弦刚性受压构件、下弦拉索和撑杆组成，通过上弦刚性受压构件沿主梁底板下缘布置，使整个NSE‐BSS加固于主梁下部。以重庆奉云高速公路孙家沟大桥为背景，采用有限元分析方法，考虑标准结构、超载、预应力损失影响因素，针对4种NSE‐BSS结构设计方案，分析了最大效应荷载加载下不同撑杆布置和拉索张拉力下桥梁的承载能力。研究结果表明，NSE‐BSS可以有效地提高大跨度连续箱梁桥的承载能力，且在超载、预应力损失影响因素下加固效果更明显，撑杆由竖撑和斜撑组合的张弦梁结构G H‐XS和DG‐XS方案加固效果更优。
침대목전가고기술대개선대과도련속상량교승재능력유한등정황，인입비자평형장현량결구（NSE‐BSS ），대대과도련속상량교비자평형장현량결구（NSE‐BSS）가고방안진행연구。NSE‐BSS유상현강성수압구건、하현랍색화탱간조성，통과상현강성수압구건연주량저판하연포치，사정개NSE‐BSS가고우주량하부。이중경봉운고속공로손가구대교위배경，채용유한원분석방법，고필표준결구、초재、예응력손실영향인소，침대4충NSE‐BSS결구설계방안，분석료최대효응하재가재하불동탱간포치화랍색장랍력하교량적승재능력。연구결과표명，NSE‐BSS가이유효지제고대과도련속상량교적승재능력，차재초재、예응력손실영향인소하가고효과경명현，탱간유수탱화사탱조합적장현량결구G H‐XS화DG‐XS방안가고효과경우。
The existing strengthening methods are considered having limited effect in impro‐ving the load bearing capacity of long‐span continuous box girder bridge .In this study ,the non‐self‐equilibrium bowstring beam structure(NSE‐BSS) is introduced ,to study the schemes of using NSE‐BSS to strengthen long‐span continuous box girder bridge .The NSE‐BSS is composed of the upper chord rigid compressive components ,lower chord cables and struts .By installing the upper chord rigid compressive members along the lower edge of the main girder base plate ,the whole NSE‐BSS was strengthened to the bottom of the main girder .The Sunjiagou Brige on Chongqing‐Fengyun Expressway was taken as the study background .The finite element method was used to analyze four BSE‐BSS structural design schemes by considering the influential factors ,including standard structure ,overloading and prestress loss .Under the maximum load effect applied ,the load bearing capacity of the bridge with different strut arrangement and cable tensioning force was analyzed .The results of the study indicate that NSE‐BSS can effectively improve the load bearing capacity of long‐span continuous box girder bridge ,and the strengthening effect would be more ap‐parent under the influence of overloading and prestress loss ,and the bow string beam structures of GH‐XS and DG‐XS with combination of vertical struts and oblique struts have better strengthening effect .