平衡张拉法在复杂节点中的应用

Application of balance pretension on beam string structure construction

平衡张拉法是通过拉索节点力学平衡来实现拉索的张拉,仅需张拉同一节点上1根或部分拉索便可以实现整个结构体系预应力建立,该法简洁、高效,应用广泛。结合河南省体育中心游泳跳水馆张弦梁屋盖拉索的施工张拉,提出了平衡张拉的关键技术,并通过理论推导和有限元施工张拉模拟分析,提出了用上弦梁张拉起拱滞后程度来判别索力偏差大小的方法。

Balance pretension is the method which can build the whole tension system only by tensioning one cable or part of cables,based on a mechanical balance of the joint.The method is simple,efficient and widely applied.Some key issues were presented on the balance pretension of beam string structure construction,based on a practical project in Henan,and the degree of arch camber delay of the upper beam was presented for the judgement of cable stress.