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施工张拉控制是张弦网壳结构的关键技术之一,提出采用控制索原长的反分析方法追踪结构施工整个过程。首先,通过控制索在预应力状态下的张拉力求出零状态和索原长,并同时获得预应力态下所有单元的内力。在此基础上,通过控制每一级张拉索的原长,进行非线性有限元迭代计算,可求出索在分级分批施工时的控制力,并用VC++6.0编制相应的计算程序。这一方法有效地避免了通用有限元需要反复试算,计算繁琐的缺点。最后,以张弦网壳结构模型为试验对象,按分级分批张拉的方式模拟结构的现场施工,并跟踪施工过程中杆件单元的应力状态。结果表明,数值模拟计算与试验值吻合较好,计算结果可靠,该方法能精确模拟结构的施工成形过程,且在整个过程中,每根索只需张拉一次,简化了施工工艺。
The construction tension control is one of the key technologies of the string-shell reticular shell structure. It is proposed to use the inverse analysis method of controlling the length of the cable to track the whole process of the structure construction. First of all, by controlling the cable tension in the prestressed state to find the zero state and the rope length, and at the same time get all the internal forces of prestressed state. Based on this, by controlling the original length of each tension cable, the nonlinear finite element iterative calculation can be used to calculate the control force of cable in grading and batch construction, and the corresponding calculation program is compiled by VC ++ 6.0. This method effectively avoids the common finite element requires repeated trial calculation, calculation of the shortcomings. Finally, with the truss shell structure model as the test object, the site construction of the structure is simulated by grading and batch tensioning, and the stress state of the bar element in the construction process is tracked. The results show that the numerical simulation is in good agreement with the experimental data and the calculation result is reliable. The method can accurately simulate the construction forming process of the structure, and only one tensioning per cable is needed in the whole process, which simplifies the construction process.