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在丫髻沙特大桥的病害诊治过程中,多支撑柔性系杆的内力识别是一项关键内容,系杆的结构与柔性吊杆相似,但其特殊的边界条件给内力识别带来困难。根据系杆的振动特性,基于有限单元法,结合最小势能原理,推导了能够考虑多道弹性支撑和含初始内力的振动特征方程,从而通过拾取系杆的振动特征频率,便能求解系杆的张力。在此基础上,通过选用与系杆内部组成相同的单根钢绞线模拟多支撑振动试验,计算拉力比实测拉力大4.85%;得到采用本文方法由振动频率计算的拉力与实际拉力值吻合得较好,对丫髻沙特大桥的两根系杆分别采用频率法和液压千斤顶张拉法识别系杆的内力,两种方法得到的系杆张力极为相近,最大偏差在1%以内,从而验证了本文计算方法的可靠性。
In the process of disease diagnosis and treatment of Yajisha Bridge, the internal force identification of multi-support flexible tie rod is a key issue. The tie rod structure is similar to that of flexible hanger rod, but its special boundary conditions make it difficult to identify the internal force. According to the vibration characteristics of the tie bars, based on the finite element method, combined with the principle of minimum potential energy, the vibration characteristic equation that can consider the elastic support and the initial internal force can be deduced. By picking up the vibration characteristic frequency of the tie rod, tension. On this basis, the multi-support vibration test was simulated by using a single strand with the same internal structure as that of the tie rod, and the calculated tensile force was 4.85% greater than the measured tensile force. The tensile force calculated by the vibration frequency from this method agrees well with the actual tensile force It is better to identify the internal forces of the tie rods by using the frequency method and the hydraulic jack tension method for the two tie rods of the Yajisha Bridge respectively. The tie rod tension obtained by the two methods is very similar and the maximum deviation is within 1% The reliability of the method.