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针对弦支穹顶张拉环索施工过程中存在的问题,提出了一种滚动式张拉索节点,从概念上解决了索体与节点摩擦阻力过大的问题。基于常应变假定提出与滚动式张拉索节点配套的多节点连续折线索单元算法,以模拟拉索在节点间滑动的行为,并给出单元详细推导过程和单元刚度矩阵表达。最后进行了算例分析,证明了单元理论和公式的正确性和有效性。分析表明,对称荷载下环索节点是否可滑对结构性能影响不大,当承受不对称荷载且环索节点不可滑动时,下部张拉体系环索各索段索力会有不同,采用滚动式张拉索节点时,各索段索力则会保持均衡。
Aiming at the existing problems in the construction process of the tension ring of the chord dome, a rolling tension cable node is proposed to solve the problem that the frictional resistance of the cable body and the node is too large. Based on the constant strain assumption, a multi-node continuous crooked line element algorithm is proposed to simulate the sliding behavior of the cable between nodes. The detailed derivation process of element and matrix expression of element stiffness are given. Finally, a case study is carried out to prove the correctness and validity of the unit theory and formula. The analysis shows that under the symmetrical load, whether the slip ring node is slippery has little effect on the structural performance. When the unsymmetrical load and the slip ring node are not slidable, the cable tension of each cable segment in the lower tension ring system will be different. When the tension cable node, each cable segment cable force will be balanced.