Analysis For The Factors Affecting Fulcrum Reaction Force Of Continuous Skew Bridge

With the development of the transportation industry and the increase in the state’s infrastructure investment, skew bridge have the advantages of adapting linear requirements, reducing the span and saving resources, which are increasingly used in highways, urban roads and the construction of three-dimensional transport hub. The construction and theoretical studies of skew bridge in China started so late that the existing research is not systematic and perfect. Therefore, as the research background of prestressed concrete skew box girder bridge named ZhiXing bridge in this paper, which carried out comparative study of the ramp bridge fulcrum reaction in the dead load effect. About the contents of this paper include three aspects:(1) Using ANS YS finite element software establish simulation model for Zhi Xing bridge with one end supporting slope of thirty degrees and the other end slope of fifteen degrees. Compare the measured and calculated data in the dead load, the models agree well with the measured data.(2) Establish simulation model with both ends of the slope is fifteen degrees, compared with model data, analysis the fulcrum reaction force distribution of the equal slope skew beam bridge and unequal slope skew beam brodge, arrive that both the special-shaped bridge and the equal slope skew girder bridge, the fulcrum reaction force appears at the same location, but the difference of fulcrum reaction force at the same pier for special-shaped bridge increases, the force distribution is more uneven.(3) Establish simulation the continuous skew beam bridge model with one end supporting slope of fifteen degrees and the other end slope of zero degree、fifteen degrees、thirty degrees and forty-five degrees, analyze the influence of the difference of slope for fulcrum reaction force; Within a reasonable side span and the cross-ratio range, create a different side span and the cross-ratio of three-span continuous girder bridge model to oblique cross-ratio analysis of changes in the side span and mid-span ratio on the fulcrum reaction force.