高速铁路斜拉桥二次调索计算分析

摘要

During the construction process of cable-stayed bridge,due to various factors,the actual value and theoretical calculation of cable force often have a certain bias.To ensure the security of bridge force during the construction of cable-stayed bridge and the cable force of bridge status can achieve the desired design value,there is a need to control and adjust the cable force of cable-stayed bridge.Combined with the practical engineering of a high-speed railway bridge,mathematical model is established to simulatet the secondary adjustment of the cable force based on the principles of impact matrix,and the adjusted cable force of stay cable is calculated,which is applied to calculate the reasonable cable force finally,and secondary tension is conducted when construction.This method has been applied to the design and construction of new high-speed railway cable-stayed bridge.Through the adjustment of cable force,we can significantly eliminate the deviation between the actual value and theoretical value of cable force,and establish a reasonable internal force and an ideal linear of cable-stayed bridge.The method can also be applied to the offset adjustment of cable force of cable-stayed bridge during the high-speed railway operational phase,and provide data support for the operation and maintenance.%在斜拉桥施工过程中，由于各种因素的影响，使得实际的索力与理论计算的索力往往存在一定的偏差。为保证斜拉桥施工过程中桥梁受力安全和成桥状态索力达到设计的预期值，需要对斜拉桥的索力进行控制和调整。文章结合某高速铁路桥梁实际工程，根据影响矩阵原理建立数学模型进行二次调索模拟，并对斜拉索的施调索力进行计算，最终得出斜拉桥的合理成桥索力，施工时进行二次张拉。该方法在新建高速铁路斜拉桥的设计与施工中得到了具体应用。通过对索力的调整，可以显著消除实际索力值与理论值的偏差，在斜拉桥中建立起合理的内力和理想的线形。该方法也可应用于高速铁路运营阶段斜拉桥的索力偏差调整，为运营和养护提供了数据支持。