Analysis of Mechanical Property of Steel-UHPC Composite Girder Cable-Stayed Bridge When Raising Elevation of Auxiliary Piers to Improve Loading Condition at Negative Bending Moment Zone
Analysis of Mechanical Property of Steel-UHPC Composite Girder Cable-Stayed Bridge When Raising Elevation of Auxiliary Piers to Improve Loading Condition at Negative Bending Moment Zone
This paper studies the approach to alleviate the negative bending moments in the long-span steel-UHPC composite girder cable-stayed bridge.The main bridge of Huanghe River Bridge carrying a section of the Zhanhua-Linyi Expressway that has a main span of 442 m is used as a case.The 3D finite element model of the bridge was developed in MIDAS Civil to calculate the stay cable lengths in stress-free state and the alignment of the steel-UHPC composite girder after the completion of the bridge.Based on the calculations,the variations of the parameters,including bending moment,stresses in girder soffit,and stresses in the top(bottom)edges of the UHPC panels,were checked when the auxiliary piers were raised during construction.It is shown that raising the auxiliary piers can alleviate or eliminate the negative bending moments in the composite girder at the auxiliary piers,and significantly enlarge the compressive stress margin of the UHPC panels in the negative bending moment zone,which achieves the similar effect of adding prestressing tendons,as a result,the mechanical property of the steel-UHPC composite girder in the negative bending moment zone is remarkably improved.
关键词
斜拉桥/钢-UHPC组合梁/支点位移法/无应力索长/成桥线形/力学性能/有限元法
Key words
cable-stayed bridge/steel-UHPC composite girder/raising auxiliary pier/cable length in stress-free state/alignment of completed bridge/mechanical property/finite element method
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