In order to study the non-uniformity of internal force distribution in the pile group foundation and its influencing factors when the cap is in a single-point stress mode under the rotating condition of the bridge,taking a large-tonnage rotating construction cable-stayed bridge as an engineering example,the pile foundation reaction with the help of the elastically braced strut-and-tie model was calculated in this paper,and the influence of different thickness of the cap on the non-uniformity of internal force distribution of the pile foundation was analyzed.A finite element model of the cap-pile foundation was established to calculate the internal forces and distribution of the pile foundation under rotational conditions,and compared with the measured results to study the effect of applying prestress to the flexible cap on the internal force distribution of the pile foundation.The results show that when the relative stiffness coefficient of the cap is greater than 4,it meets the requirements of a rigid pier and the internal forces of the pile group are relatively evenly distributed.When the relative stiffness coefficient of the cap is less than or equal to 4,it is a semi-rigid or flexible bearing platform,and the internal forces of the pile group exhibit non-uniformity where the central pile is greater than the surrounding piles,and the smaller the relative stiffness coefficient,the more significant the non-uniformity.Reasonably applying longitudinal and transverse prestress to semi-rigid and flexible caps can effectively improve the problem of uneven distribution of internal forces in pile groups.
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