桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
3期
99-103
,共5页
连续梁桥%整体顶升%桥梁维修%有限元法%顶升误差%应力分析
連續樑橋%整體頂升%橋樑維脩%有限元法%頂升誤差%應力分析
련속량교%정체정승%교량유수%유한원법%정승오차%응력분석
continuous girder bridge%integral jacking-up%bridge repairing%finite element method%jacking-up error%stress analysis
北江大桥为多跨连续梁桥，由于佛开高速扩建，该桥引桥采用整体同步顶升施工，需顶升0．150～1．491 m。为分析该桥在顶升施工中的梁体受力，为施工提供指导，采用ANSYS软件建立该桥15～22号墩连续梁模型，对同步顶升力、落梁调整到位后梁体的受力进行计算分析，并研究纵、横向误差对梁底应力和支座反力的影响。结果表明：在同步顶升过程中，理论顶升力与实测值接近；落梁后梁体应力变化的理论值与实测值接近，梁体仍处于受压状态；1 cm的纵向顶升误差不会使梁体出现拉应力，也不会使支座反力出现较大变化；1 cm的横向顶升误差使梁体出现拉应力，使支座反力出现较大变化。因此须严格控制顶升误差，建议纵向顶升误差不超过10mm，横向不超过5mm。
北江大橋為多跨連續樑橋，由于彿開高速擴建，該橋引橋採用整體同步頂升施工，需頂升0．150～1．491 m。為分析該橋在頂升施工中的樑體受力，為施工提供指導，採用ANSYS軟件建立該橋15～22號墩連續樑模型，對同步頂升力、落樑調整到位後樑體的受力進行計算分析，併研究縱、橫嚮誤差對樑底應力和支座反力的影響。結果錶明：在同步頂升過程中，理論頂升力與實測值接近；落樑後樑體應力變化的理論值與實測值接近，樑體仍處于受壓狀態；1 cm的縱嚮頂升誤差不會使樑體齣現拉應力，也不會使支座反力齣現較大變化；1 cm的橫嚮頂升誤差使樑體齣現拉應力，使支座反力齣現較大變化。因此鬚嚴格控製頂升誤差，建議縱嚮頂升誤差不超過10mm，橫嚮不超過5mm。
북강대교위다과련속량교，유우불개고속확건，해교인교채용정체동보정승시공，수정승0．150～1．491 m。위분석해교재정승시공중적량체수력，위시공제공지도，채용ANSYS연건건립해교15～22호돈련속량모형，대동보정승력、락량조정도위후량체적수력진행계산분석，병연구종、횡향오차대량저응력화지좌반력적영향。결과표명：재동보정승과정중，이론정승력여실측치접근；락량후량체응력변화적이론치여실측치접근，량체잉처우수압상태；1 cm적종향정승오차불회사량체출현랍응력，야불회사지좌반력출현교대변화；1 cm적횡향정승오차사량체출현랍응력，사지좌반력출현교대변화。인차수엄격공제정승오차，건의종향정승오차불초과10mm，횡향불초과5mm。
The Beijiang River Bridge is a multi‐span continuous girder bridge .The approach bridge of the bridge needed to be constructed by the integral and synchronous jacking‐up owing to the expansion of Foshan‐Kaiping Expressway and was to be jacked up 0 .150~1 .491 m .To ana‐lyze the force conditions of the continuous girder of the approach bridge in the process of the jack‐ing‐up construction and to provide guidance for the construction ,the software ANSYS was used to establish the model for the girder of the bridge atop Piers No .15~ No .22 ,the synchronous jacking‐up forces and force conditions of the girder after the girder was lowered down and adjus‐ted were calculated and analyzed and the influences of the longitudinal and transverse jacking‐up errors on the girder bottom stress and bearing reaction forces were studied .The results of the study show that in the integral and synchronous jacking‐up construction , the theoretical and measured jacking‐up forces are close .The theoretical and measured values of the stress changes of the girder after the girder is lowered down are close and the girder remains the state of com‐pression .The longitudinal jacking‐up error of 1 cm will neither cause the girder to have tensile stress ,nor cause the bearing reaction forces to significantly change .The transverse jacking‐up error of 1 cm will cause the girder to have tensile stress and cause the bearing reaction forces to significantly change .In such case ,the jacking‐up errors should be strictly controlled and it is proposed that the longitudinal jacking‐up error should not be greater than 10 mm while the trans‐verse jacking‐up error not be greater than 5 mm .
