悬索桥锚跨索股索力的精确计算与调整方法

为获得悬索桥锚跨索股高精度索力,便于施工过程中索力控制,基于泰州长江公路大桥锚跨索股参数识别结果,利用桥梁结构非线性分析软件BNLAS建立了锚跨索股的精细化模型.通过赋予该模型中索股不同的初始索力值,得到一系列一一对应的索力-频率数据;对这些数据进行回归分析,建立索力与频率的显式关系,从而无需通过迭代求解超越方程获得索力.基于弹性理论计算,提出了索力的调整方法,即将索力的调整转换为锁紧螺母螺距的调整.研究结果表明:用提出的方法计算索力,误差均在3%以内;所提出的索力调整方法可靠,满足施工控制对索力监控的要求.

Accurate Calculation and Adjustment Methods for Cable Forces of Anchor-Span Strands for Suspension Bridges

In order to accurately obtain the cable forces of anchor-span strands for suspension bridges to easily control the cable forces in construction course,a refinement model was established using nonlinear analysis software BNLAS and based on identified parameters of anchor-span strands of Taizhou Yangtze River bridge.A series of cable force-frequency data was obtained by assigning different initial cable forces of cable strands in the model.The explicit expression of cable force-frequency relationship was obtained by the regression analysis of the data to give a method of cable force calculation and avoid solving a transcendental equation by iteration to gain the cable forces.Based on elasticity theory calculation,a measure of cable force adjustment was put forward,that is cable force adjustment is transformed into screw pitch adjustment.The research results show that the method of cable force calculation has an error of less than 3%,and the measure of cable force adjustment is reliable and can meet the need of cable force control during the construction.