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Study of Using Non-Self-Equilibrium Bowstring Beam Structure to Strengthen Long-Span Continuous Box Girder Bridge
Pages: 80-84
Year: Issue:  5
Journal: World Bridges

Keyword:  box girder bridgelong spannon-self-equilibriumbowstring beamstrengthe-ningoverloadingprestress lossfinite element method;
Abstract: 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 .
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