系杆拱桥吊杆索力计算方法研究

Suspender Force Calculation Methods of Tied Arch Bridge

在介绍采用实测频率计算吊杆索力这一方法的基础上,结合某系杆拱桥吊杆张拉时的实测频率,就吊杆索的计算长度、边界约束条件、线密度和索体的抗弯刚度对吊杆力的影响进行了对比分析。结果表明,在对实测计算索力进行分析时应综合考虑索体的计算长度、边界条件和线密度,应注意观察吊杆上下端是否与套管触碰。如实测吊杆力偏离理论值很大,应考虑采用千斤顶张拉并同步测量频率的方法进行校验。

The paper introduces the way of calculating the suspender force with measured frequency. Based on the method and combining with the measured frequency of suspender tensioning of a tied arch bridge, the pa- per makes a comparative analysis about the effect of calculated length, boundary condition, linear density and bending rigidity of suspender on suspender force. The results show that the calculated length, boundary condition and line density of the suspender should be comprehensively considered when the suspender force is calculated. Meanwhile it must be paid attention to that whether the ends of the suspender are touching the casing pipe. If the measured value of suspender force greatly deviates from the theoretical value, it should be checked by jack stretching and measuring the frequency at the same time.