The Study On Anti-push Rigidity And Influencing Factors Of Reinforced Concrete Double-limb Pier With Gap

With the rapid development in the field of bridge in China,continuous bridge,cable-stayed bridge and partially cable-stayed bridge are more and more popular in bridge construction.Due to many conditions and factors,when designing the substructure,a short pier design can not be avoided.In addition to satisfying the load supporting the superstructure,the substructure in the rigid structure system needs to adapt to the longitudinal deformation caused by the temperature and shrinkage of the superstructure.In order to adapt to the deformation and reduce the structural temperature stress,the bridge is mainly used the form of thin-walled piers and double-thin piers structure,to meet the requirements of flexible piers,domestic and overseas.In this paper,taking the Changde yuanshui fourth bridge as the engineering background,put forward a kind of reinforced concrete double pier with a small gap.Compared with the ordinary double limbs pier,the double pier with a gap optimizing the layout and structure,while making the cable tower,the main beam and the base,the basic layout more relatively simple.Saving materials and cost.Keeping consistent in shape with the integral pier.Occupying a small field and achieving the beautiful requirements of urban bridges.This paper mainly studies the following aspects:(1)Aiming at the new double-limb pier with gap,four different cross-section models were constructed,the anti-push stiffness of the the new double-limb pier was analyzed and studied.The strain value of the concrete and the steel and the horizontal displacement value of the pier top was measured under the static displacement method.The deformation rule and the anti-push stiffness of the four models were compared and analyzed by horizontal displacement.(2)The finite element software ANSYS was used to establish the four reinforced concrete solid element models.The finite element model was compared with the experimental results to verify the correctness of the test results.At the same time,through the simulation of finite element software,the contact between concrete and packing in the loading process was briefly discussed.(3)Put forward a more realistic calculation model of the new double-limb pier of the anti-push stiffness.The influence of different parameters on the anti-push stiffness was analyzed,and the influence of different parameters on the anti-push stiffness was analyzed and obtained,which provides the theoretical basis for the design of piers in engineering.