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针对在索杆张力工程中普遍存在施工误差、同时又缺乏能有效控制误差效应的张拉方案选择技术现状,首先基于随机理论构建了杆件长度误差的数学模型,并通过分析索杆张力结构的自应力模态数和机构位移数提出了确定主动索数的基本思路;然后基于空间铰接索杆结构的三大方程构建预张力偏差与杆件长度偏差的基本关系,并在此基础上进一步构建了以主动张拉索索内力可精确控制条件下其余被动索索内力偏差与杆件长度偏差关系,由此来分析评价各张拉成型方案被动索杆内力偏差效应,进而提出能有效控制误差效应的张拉成型方案优选方法;最后以算例分析表明,通过机构分析可初步确定主动张拉索数,不同张拉成型方案具有不同的施工精度,实际工程中可结合施工条件优先选择施工精度高的张拉成型方案。
In view of the common construction error in the cable tension engineering and the lack of the existing selection scheme of the tension scheme that can effectively control the error effect, a mathematical model of the length error of the rod is constructed based on the stochastic theory. The basic idea of determining the number of active cables is proposed based on the number of stress modes and the displacement of the mechanism. Then, based on the three equations of the space-hinged cable structure, the basic relationship between the pre-tension deviation and the length deviation of the rod is constructed. Based on this, In order to actively control the internal tension of the cable can be accurately controlled under the conditions of the rest of the passive cable force deviation and the length of the deviation between the bars to analyze and evaluate the various tension forming passive paddle force bias effect and then put forward to effectively control the error effect of Zhang Finally, a case study shows that, through the mechanism analysis, the number of active tension cables can be initially determined, and different tensioning schemes have different construction precision. In practical engineering, the construction accuracy can be preferentially chosen in accordance with the construction conditions Pull forming program.