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将向心关节索杆体系应用于弦支穹顶结构中,改变以往张拉环向索通过环向拉索滑动传递预应力的方式,利用撑杆的转动位移建立预应力,避免环索与节点摩擦出现预应力损失的问题。以东亚运动会团泊自行车馆弦支穹顶张拉分析为例,采用有限元分析软件ANSYS进行施工放样态正分析找形和反分析找形,得到了结构张拉前的放样态。结果表明,反分析找形对于该类索杆体系放样态找形更加有利。经反分析找形,最终采用混合张拉方式,即先预紧径向拉杆,再张拉环向索。对张拉过程进行了全程模拟,得到张拉过程中张拉力及网壳位移控制值,获得设计预应力态。
The centripetal joint cable system is applied to the chord support structure, which can change the way that the tension ring transmits the prestress to the cable through the circumferential cable in the past, and uses the rotational displacement of the support bar to establish the prestress to avoid the friction between the ring cable and the node Appear prestress loss problem. Taking the example of Tensile Dome Tension Analysis of Tuanzhou Bicycle Park in East Asian Games, the finite element analysis software ANSYS was used to analyze the shape, shape and back analysis of the construction stance, and the loft state of the structure before tension was obtained. The results show that the anti-analysis shape-finding is more favorable to the appearance of the rod-like system. After the reverse analysis of the shape, the final use of hybrid tensioning method, that is, pre-tighten the radial rod, and then stretch the ring to the cable. The whole process of the tensioning process is simulated and the control values of the tension and the displacement of the reticulated shell during the tensioning process are obtained to obtain the design prestressing state.