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基于一种由静力位移测量值识别车辐式结构索力的方法,该文评估了位移测量误差对于索力识别结果的影响,用数值计算及理论推导得到了二者的关系。索力识别误差是位移测量误差的单调函数。在位移值远大于测量误差时,该函数接近线性,否则有明显的非线性。在误差幅值相同的情况下,选择不同的加载及测量方案,索力识别的精度是不同的:单位荷载产生的节点位移越大,索力识别结果的误差就越小。对多种加载-测量方案进行了比选,归纳了制定索力识别方案时应遵循的原则:加载方案应使结构的几何刚度发挥主要作用。对车辐式结构而言,在荷载总量一定的情况下,在半跨或1/4跨布置荷载能获得较好的索力识别结果。
Based on a method of recognizing the cable force of the vehicle spoke structure by static displacement measurement, this paper evaluates the influence of displacement measurement error on the results of cable force identification, and obtains the relationship between the two by numerical calculation and theoretical derivation. Cable force identification error is a monotonic function of displacement measurement error. When the displacement is much larger than the measurement error, the function is close to linear, otherwise there is obvious nonlinearity. In the case of the same error amplitude, different load and measurement schemes are selected, the accuracy of cable force identification is different: the greater the node displacement generated by unit load, the smaller the error of cable force identification results. A variety of load - measure options were compared and summarized the principle to be followed in the development of cable force identification scheme: loading scheme should make the structure of the geometric stiffness play a major role. For the vehicle spoke structure, in the case of a certain total load, the results of the cable force identification can be obtained in half span or 1/4 span load.